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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#749934 | #7006. Rikka with Subsequences | Made_in_Code | AC ✓ | 734ms | 4320kb | C++14 | 1.6kb | 2024-11-15 11:33:52 | 2024-11-15 11:33:53 |
Judging History
answer
#include <iostream>
#define LL long long
using namespace std;
const int kMaxN = 201, kMod = 1e9 + 7;
int t, n, a[kMaxN];
LL ans;
LL f[kMaxN][kMaxN]; // 三个子序列分别以 i, j, k 作为开头, 其中 i 一维滚动
LL g[kMaxN][kMaxN]; // 只有 j, k 被转移, i 还在原来的地方, 其中 i 一维滚动
bool e[kMaxN][kMaxN];
int main() {
cin.tie(0), cout.tie(0);
ios::sync_with_stdio(0);
cin >> t;
while (t--) {
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> a[i];
}
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= n; j++) {
static char c;
cin >> c, e[i][j] = c == '1', f[i][j] = g[i][j] = 0;
}
}
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= n; j++) { // 对 f_{i-1} 的 j, k 两维做前缀和
for (int k = 1; k <= n; k++) {
f[j][k] = (f[j][k] + f[j - 1][k] + f[j][k - 1] - f[j - 1][k - 1] + kMod) % kMod;
}
}
for (int j = 1; j <= n; j++) { // 将 i-1 加入 g 中, 同时在 i 一维做前缀和
for (int k = 1; k <= n; k++) {
if (a[j] == a[k] && e[a[i - 1]][a[j]]) {
g[j][k] = (g[j][k] + f[j - 1][k - 1]) % kMod;
}
}
}
for (int j = 1; j <= n; j++) { // 计算 f_i
for (int k = 1; k <= n; k++) {
if (a[i] == a[j] && a[i] == a[k]) {
f[j][k] = (g[j][k] + 1) % kMod;
ans = (ans + f[j][k]) % kMod;
} else {
f[j][k] = 0;
}
}
}
}
cout << ans << '\n', ans = 0;
}
return 0;
}
这程序好像有点Bug,我给组数据试试?
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3648kb
input:
1 4 1 2 1 2 1111 1111 1111 1111
output:
51
result:
ok single line: '51'
Test #2:
score: 0
Accepted
time: 734ms
memory: 4320kb
input:
20 195 4 5 4 3 2 4 3 5 1 5 4 3 4 3 1 5 4 4 5 2 2 2 2 4 1 5 3 4 1 1 1 2 1 1 5 5 4 5 4 5 5 4 5 2 1 2 5 4 5 1 1 3 1 2 2 3 3 5 2 3 3 1 4 4 2 4 2 4 3 4 1 1 1 4 3 5 1 1 3 2 2 5 1 3 1 5 1 5 5 3 5 3 3 2 5 1 3 2 4 1 5 5 1 3 3 2 4 2 3 3 3 4 1 3 3 3 5 5 1 1 4 2 5 1 2 5 4 3 5 1 5 5 5 4 2 2 5 3 2 3 4 1 3 2 1 5 3...
output:
806298135 541285042 48173297 222851978 875793336 100057791 156057874 129923599 551277543 874547790 544405786 653241411 521317929 370918040 803940504 969296122 806596012 469227084 338962879 194278629
result:
ok 20 lines