QOJ.ac
QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#630141 | #6746. Merge the Rectangles | Qzong# | AC ✓ | 78ms | 26660kb | C++14 | 2.5kb | 2024-10-11 16:42:34 | 2024-10-11 16:42:38 |
Judging History
answer
#include <bits/stdc++.h>
const int N = 1510;
int n, m;
char str_dn[N][N], str_rg[N][N];
// (n-1)*m n*(m-1)
int sum_dn[N][N], sum_rg[N][N];
int calc_dn(int x1, int y1, int x2, int y2) {
return sum_dn[x2][y2] - sum_dn[x1 - 1][y2] - sum_dn[x2][y1 - 1] + sum_dn[x1 - 1][y1 - 1];
}
int calc_rg(int x1, int y1, int x2, int y2) {
return sum_rg[x2][y2] - sum_rg[x1 - 1][y2] - sum_rg[x2][y1 - 1] + sum_rg[x1 - 1][y1 - 1];
}
bool check(int x1, int y1, int x2, int y2) {
if (x1 < x2 && calc_dn(x1, y1, x2 - 1, y2)) return 0;
if (y1 < y2 && calc_rg(x1, y1, x2, y2 - 1)) return 0;
return 1;
}
bool solve(int x1, int y1, int x2, int y2, bool flag) {
if (check(x1, y1, x2, y2)) return 1;
if (!flag) {
if (x1 == x2) return 0;
std::vector<int> pos;
while (pos.size()) pos.pop_back();
for (int i = x1; i < x2; i ++)
if (calc_dn(i, y1, i, y2) == y2 - y1 + 1) pos.push_back(i);
if (!pos.size()) return 0;
if (!solve(x1, y1, pos[0], y2, 1)) return 0;
if (!solve(pos.back() + 1, y1, x2, y2, 1)) return 0;
for (int i = 0; i < pos.size() - 1; i ++)
if (!solve(pos[i] + 1, y1, pos[i + 1], y2, 1)) return 0;
return 1;
} else {
if (y1 == y2) return 0;
std::vector<int> pos;
while (pos.size()) pos.pop_back();
for (int j = y1; j < y2; j ++)
if (calc_rg(x1, j, x2, j) == x2 - x1 + 1) pos.push_back(j);
if (!pos.size()) return 0;
if (!solve(x1, y1, x2, pos[0], 0)) return 0;
if (!solve(x1, pos.back() + 1, x2, y2, 0)) return 0;
for (int j = 0; j < pos.size() - 1; j ++)
if (!solve(x1, pos[j] + 1, x2, pos[j + 1], 0)) return 0;
return 1;
}
}
int main() {
scanf("%d%d", &n, &m);
for (int i = 1; i < n; i ++) scanf("%s", str_dn[i] + 1);
for (int i = 1; i <= n; i ++) scanf("%s", str_rg[i] + 1);
for (int i = 1; i < n; i ++)
for (int j = 1; j <= m; j ++)
sum_dn[i][j] = sum_dn[i - 1][j] + sum_dn[i][j - 1] - sum_dn[i - 1][j - 1]
+ (str_dn[i][j] == '1');
for (int i = 1; i <= n; i ++)
for (int j = 1; j < m; j ++)
sum_rg[i][j] = sum_rg[i - 1][j] + sum_rg[i][j - 1] - sum_rg[i - 1][j - 1]
+ (str_rg[i][j] == '1');
if (solve(1, 1, n, m, 0) || solve(1, 1, n, m, 1))
puts("YES");
else
puts("NO");
return 0;
}
詳細信息
Test #1:
score: 100
Accepted
time: 1ms
memory: 7696kb
input:
3 4 0000 0111 101 101 110
output:
YES
result:
ok answer is YES
Test #2:
score: 0
Accepted
time: 1ms
memory: 7756kb
input:
3 3 110 011 01 11 10
output:
NO
result:
ok answer is NO
Test #3:
score: 0
Accepted
time: 14ms
memory: 25804kb
input:
1500 1500 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
output:
YES
result:
ok answer is YES
Test #4:
score: 0
Accepted
time: 27ms
memory: 25884kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
YES
result:
ok answer is YES
Test #5:
score: 0
Accepted
time: 13ms
memory: 25944kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
YES
result:
ok answer is YES
Test #6:
score: 0
Accepted
time: 4ms
memory: 25844kb
input:
1500 1500 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
output:
YES
result:
ok answer is YES
Test #7:
score: 0
Accepted
time: 24ms
memory: 26148kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
NO
result:
ok answer is NO
Test #8:
score: 0
Accepted
time: 10ms
memory: 25864kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
NO
result:
ok answer is NO
Test #9:
score: 0
Accepted
time: 8ms
memory: 25860kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
NO
result:
ok answer is NO
Test #10:
score: 0
Accepted
time: 20ms
memory: 25952kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
YES
result:
ok answer is YES
Test #11:
score: 0
Accepted
time: 28ms
memory: 25916kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
YES
result:
ok answer is YES
Test #12:
score: 0
Accepted
time: 27ms
memory: 25892kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
YES
result:
ok answer is YES
Test #13:
score: 0
Accepted
time: 36ms
memory: 25944kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
NO
result:
ok answer is NO
Test #14:
score: 0
Accepted
time: 32ms
memory: 26440kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
YES
result:
ok answer is YES
Test #15:
score: 0
Accepted
time: 36ms
memory: 26436kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
YES
result:
ok answer is YES
Test #16:
score: 0
Accepted
time: 61ms
memory: 25936kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
NO
result:
ok answer is NO
Test #17:
score: 0
Accepted
time: 55ms
memory: 25864kb
input:
1500 1500 01111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
NO
result:
ok answer is NO
Test #18:
score: 0
Accepted
time: 32ms
memory: 26384kb
input:
1500 1500 10111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
YES
result:
ok answer is YES
Test #19:
score: 0
Accepted
time: 32ms
memory: 26660kb
input:
1500 1500 01111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
YES
result:
ok answer is YES
Test #20:
score: 0
Accepted
time: 28ms
memory: 25812kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
NO
result:
ok answer is NO
Test #21:
score: 0
Accepted
time: 34ms
memory: 26164kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
NO
result:
ok answer is NO
Test #22:
score: 0
Accepted
time: 32ms
memory: 26380kb
input:
1500 1500 01111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
YES
result:
ok answer is YES
Test #23:
score: 0
Accepted
time: 31ms
memory: 26336kb
input:
1500 1500 10111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
YES
result:
ok answer is YES
Test #24:
score: 0
Accepted
time: 74ms
memory: 25864kb
input:
1500 1500 01111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
NO
result:
ok answer is NO
Test #25:
score: 0
Accepted
time: 78ms
memory: 26156kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
NO
result:
ok answer is NO
Test #26:
score: 0
Accepted
time: 28ms
memory: 26660kb
input:
1500 1500 01111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
YES
result:
ok answer is YES
Test #27:
score: 0
Accepted
time: 24ms
memory: 26368kb
input:
1500 1500 11011111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
YES
result:
ok answer is YES
Test #28:
score: 0
Accepted
time: 32ms
memory: 25944kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
NO
result:
ok answer is NO
Test #29:
score: 0
Accepted
time: 39ms
memory: 25944kb
input:
1500 1500 00010000000000011110111101011011110011001110011110011101111011110111000111000110001101111011110101100011011110111101000011110111101110011110000001111011110111101111011100111100110000010110101111011110110000000001100011101111011000011001111011100110001111011110011101111011110111100000011110...
output:
YES
result:
ok answer is YES
Test #30:
score: 0
Accepted
time: 38ms
memory: 25848kb
input:
1500 1500 11100111101111011110000101000011110011101111001000001101111011110111000100011110110100101000000011001110000110111101110011110111101111011110111001000011110110001111001010110000011011110110001111010010111101111011110111000000001110111101111001010111000111000000110000000011000111000001011110...
output:
YES
result:
ok answer is YES
Test #31:
score: 0
Accepted
time: 38ms
memory: 25868kb
input:
1500 1500 11110111101111011110111101111001110000000111011110111101110011100111101101011000111100000000000111101111011110000001110000010111101000011100111101101001100110001111011110100001111011110101101110011000000001110011110111101110001100111101111011110000100000011010111101111011010111101110000000...
output:
YES
result:
ok answer is YES
Test #32:
score: 0
Accepted
time: 23ms
memory: 25932kb
input:
1500 1500 11100000000000000011100000000000000000000001110000000000000000000000000000000000000000000000001110000000000000000000000000001110000000000000000000011100000000111100000011100000011100000000000000000000000000000000000000000011100000000000000000000000001111000000000000000000000000000000000000...
output:
NO
result:
ok answer is NO
Test #33:
score: 0
Accepted
time: 27ms
memory: 25932kb
input:
1500 1500 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000111000000000000000000000000000000000000000000000000011100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
output:
YES
result:
ok answer is YES
Test #34:
score: 0
Accepted
time: 32ms
memory: 25836kb
input:
1500 1500 00011100000001111000000000000011111100000000000000000000000000000000111000000011100000000001110000111111000000000000000001111000000000000000011110000000000000000000000000000000000000111111001110000000000000001111000000000000000111000000000000000000000000000000111000000000000111000000000000...
output:
YES
result:
ok answer is YES
Test #35:
score: 0
Accepted
time: 12ms
memory: 25928kb
input:
1500 1500 00000000000000000011100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001110000000000000000000000000000000011110000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000011100000...
output:
NO
result:
ok answer is NO
Test #36:
score: 0
Accepted
time: 17ms
memory: 25860kb
input:
1500 1500 00000000011100111100000000000000000000000000000000000000000000000000000111000000000000001110001110000000000001111111101110000000000000000000001111000000011100000000000000000000000000000000000000000011100000111000000000000000001111000000000000000000000000000000000011111000000000000000000000...
output:
NO
result:
ok answer is NO
Test #37:
score: 0
Accepted
time: 32ms
memory: 25800kb
input:
1500 1500 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000001110000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000011100000000000000000000000...
output:
YES
result:
ok answer is YES
Test #38:
score: 0
Accepted
time: 23ms
memory: 26120kb
input:
1500 1500 00001110000000000000000011100000000000000000000000000000000111100000000000001111000111000000000000000000000000111000000000000000000000000000000000000000000000000000000000011100000000000000000000000000000111000000000000000000000011100000000011100000000000000001110000000000000000000000000000...
output:
YES
result:
ok answer is YES
Test #39:
score: 0
Accepted
time: 11ms
memory: 25880kb
input:
1500 1500 00000000000000000000000000000000000000000000000000000000000000000000000000000000111000000000000000000000000111000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
output:
NO
result:
ok answer is NO
Test #40:
score: 0
Accepted
time: 17ms
memory: 25860kb
input:
1500 1500 00000000000000011100000000000000000000000000000000000000011100000011100000000000000011100011100000000000000000000000000000000000000000000000000000111000000001111000000000000000000000000000001111000001110000000000000000001110000000000000000000000000000000000000001111011100011100000000000000...
output:
NO
result:
ok answer is NO
Test #41:
score: 0
Accepted
time: 27ms
memory: 26184kb
input:
1500 1500 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
output:
YES
result:
ok answer is YES
Test #42:
score: 0
Accepted
time: 27ms
memory: 25872kb
input:
1500 1500 00011100000001111111000001111111000011110000000111000000000000011100000000111000000000000000001111000000000000000000000000000000011111000011110000000000000111100000000000001110000000011100001111000000001111000000000001111011110000000000000000000000000000011110000000000000000000000001110000...
output:
YES
result:
ok answer is YES
Test #43:
score: 0
Accepted
time: 27ms
memory: 25860kb
input:
1500 1500 00000000000000000000000000000000000000000000000000000000000001110000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000011100000000000000000000000000000001110000000000000000000000000000000000000000000000000000000000000000000000000000...
output:
NO
result:
ok answer is NO
Test #44:
score: 0
Accepted
time: 17ms
memory: 25796kb
input:
1500 1500 00001110001110000011110000001111111000000000000111000001110000000000000000000000000000111000000000001110000000011111001111000000000000000000011110000000000111000000001111100000001111000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000011100000...
output:
NO
result:
ok answer is NO
Test #45:
score: 0
Accepted
time: 31ms
memory: 25864kb
input:
1500 1500 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001110000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
output:
YES
result:
ok answer is YES
Test #46:
score: 0
Accepted
time: 32ms
memory: 25932kb
input:
1500 1500 00000000000000000000000000000000000001110000000000000000000000000000001110000000000000011100000000000000000111100000000000000000001111000000011100000000000000111100000000000000001110000000000000000000111000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
output:
YES
result:
ok answer is YES
Test #47:
score: 0
Accepted
time: 22ms
memory: 26148kb
input:
1500 1500 00000000000000000000000000000000000000000000000000000000000000000000000000000011100000000000000001110000000000001110000000000000000001110000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000011100...
output:
NO
result:
ok answer is NO
Test #48:
score: 0
Accepted
time: 14ms
memory: 26148kb
input:
1500 1500 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
output:
YES
result:
ok answer is YES
Test #49:
score: 0
Accepted
time: 17ms
memory: 26156kb
input:
1500 1500 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
output:
YES
result:
ok answer is YES
Test #50:
score: 0
Accepted
time: 22ms
memory: 20364kb
input:
750 1500 111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
NO
result:
ok answer is NO
Test #51:
score: 0
Accepted
time: 25ms
memory: 25936kb
input:
1500 750 111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
NO
result:
ok answer is NO
Test #52:
score: 0
Accepted
time: 10ms
memory: 18512kb
input:
750 1500 111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
YES
result:
ok answer is YES
Test #53:
score: 0
Accepted
time: 11ms
memory: 25868kb
input:
1500 750 111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
YES
result:
ok answer is YES
Test #54:
score: 0
Accepted
time: 17ms
memory: 25904kb
input:
1500 1500 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
output:
YES
result:
ok answer is YES
Test #55:
score: 0
Accepted
time: 27ms
memory: 25820kb
input:
1500 1500 01010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101...
output:
YES
result:
ok answer is YES
Test #56:
score: 0
Accepted
time: 65ms
memory: 25816kb
input:
1500 1500 11111111111110110001100000101100100110111111010111111011000111100111111111101111111110011111111111110101111111111111011111111111111111111100001100000001011001011001100001111100110000000000111111111111111111111111111111111111110111111111111111111111111000111111111111000110000011111111100011...
output:
YES
result:
ok answer is YES
Test #57:
score: 0
Accepted
time: 63ms
memory: 26152kb
input:
1500 1500 01101111111000011111111111111111111110011110011101111110000111111001111111111111111111111111111101111011101101111110001101111100001111111111111111111111000001100000110111111111110011001101111111111011100001011111100111101100001111111111111111100001111111111111011111000111111111111111101110...
output:
YES
result:
ok answer is YES