QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#227868 | #5532. Kangaroo | Camillus | 100 ✓ | 46ms | 70696kb | C++20 | 3.7kb | 2023-10-28 01:24:28 | 2023-10-28 01:24:29 |
Judging History
answer
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
using namespace std;
struct mint {
static constexpr int mod = 1'000'000'007;
int value = 0;
mint() = default;
mint(int value) : value(value) {}
};
mint operator+(const mint &A, const mint &B) {
int value = A.value + B.value;
if (value >= mint::mod) {
value -= mint::mod;
}
return mint(value);
}
mint operator-(const mint &A, const mint &B) {
int value = A.value + mint::mod - B.value;
if (value >= mint::mod) {
value -= mint::mod;
}
return mint(value);
}
mint operator*(const mint &A, const mint &B) {
return mint(1ll * A.value * B.value % mint::mod);
}
mint recA(int l, int i, int j);
mint recB(int l, int i, int j);
struct saved {
vector<vector<mint>> data0;
vector<vector<bool>> mark0;
vector<vector<mint>> data1;
vector<vector<bool>> mark1;
saved() {
data0 = vector<vector<mint>>(2024, vector<mint>(2024));
data1 = vector<vector<mint>>(2024, vector<mint>(2024));
mark0 = vector<vector<bool>>(2024, vector<bool>(2024));
mark1 = vector<vector<bool>>(2024, vector<bool>(2024));
}
bool contains(int l, int i, int j) const {
if (i == 0) {
return mark0[l][j];
} else {
return mark1[l][i];
}
};
mint& get(int l, int i, int j) {
if (i == 0) {
mark0[l][j] = true;
return data0[l][j];
} else {
mark1[l][i] = true;
return data1[l][i];
}
}
};
saved savedA;
saved savedB;
mint recA(int l, int i, int j) {
if (i > j) {
if (l % 2 == 0) {
return recB(l, j, i);
} else {
return recA(l, j, i);
}
}
if (savedA.contains(l, i, j)) {
return savedA.get(l, i, j);
}
if (l == 1) {
if (i == 0 && j == 0) {
return 1;
} else {
return 0;
}
}
if (i == j) {
return 0;
}
if (i == 0) {
mint res = 0;
if (l % 2 == 0) {
if (j == 1) {
for (int k = 0; k < j; k++) {
res = res + recA(l - 1, 0, k);
}
} else {
res = recA(l, 0, j - 1) + recA(l - 1, 0, j - 1);
}
} else {
if (j == 1) {
for (int k = j; k <= l - 2; k++) {
res = res + recA(l - 1, 0, k);
}
} else {
res = recA(l, 0, j - 1) - recA(l - 1, 0, j - 1);
}
}
return savedA.get(l, i, j) = res;
}
return savedA.get(l, i, j) = recA(l, i - 1, j) - recB(l - 1, i - 1, j - 1);
}
mint recB(int l, int i, int j) {
if (i > j) {
if (l % 2 == 0) {
return recA(l, j, i);
} else {
return recB(l, j, i);
}
}
if (savedB.contains(l, i, j)) {
return savedB.get(l, i, j);
}
if (l == 1) {
if (i == 0 && j == 0) {
return 1;
} else {
return 0;
}
}
if (i == j) {
return 0;
}
if (i == 0) {
return savedB.get(l, i, j) = 0;
}
return savedB.get(l, i, j) = recB(l, i - 1, j) + recA(l - 1, i - 1, j - 1);
}
signed main() {
#ifndef LOCAL
ios::sync_with_stdio(false);
cin.tie(nullptr);
#else
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif
int n, s, f;
cin >> n >> s >> f;
s--, f--;
cout << (recA(n, s, f) + recB(n, s, f)).value << '\n';
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Subtask #1:
score: 6
Accepted
Test #1:
score: 6
Accepted
time: 8ms
memory: 70312kb
input:
7 3 6
output:
14
result:
ok 1 number(s): "14"
Subtask #2:
score: 30
Accepted
Dependency #1:
100%
Accepted
Test #2:
score: 30
Accepted
time: 0ms
memory: 70380kb
input:
39 36 32
output:
964903316
result:
ok 1 number(s): "964903316"
Test #3:
score: 0
Accepted
time: 4ms
memory: 70572kb
input:
26 1 26
output:
955348527
result:
ok 1 number(s): "955348527"
Test #4:
score: 0
Accepted
time: 3ms
memory: 70616kb
input:
40 11 33
output:
695661890
result:
ok 1 number(s): "695661890"
Test #5:
score: 0
Accepted
time: 17ms
memory: 70536kb
input:
39 39 38
output:
717149364
result:
ok 1 number(s): "717149364"
Test #6:
score: 0
Accepted
time: 4ms
memory: 70408kb
input:
40 10 25
output:
912929610
result:
ok 1 number(s): "912929610"
Test #7:
score: 0
Accepted
time: 7ms
memory: 70380kb
input:
37 25 23
output:
250748685
result:
ok 1 number(s): "250748685"
Test #8:
score: 0
Accepted
time: 7ms
memory: 70316kb
input:
39 2 38
output:
624060592
result:
ok 1 number(s): "624060592"
Test #9:
score: 0
Accepted
time: 0ms
memory: 70400kb
input:
40 18 22
output:
739993796
result:
ok 1 number(s): "739993796"
Test #10:
score: 0
Accepted
time: 0ms
memory: 70616kb
input:
40 11 35
output:
135213497
result:
ok 1 number(s): "135213497"
Subtask #3:
score: 15
Accepted
Dependency #1:
100%
Accepted
Dependency #2:
100%
Accepted
Test #11:
score: 15
Accepted
time: 4ms
memory: 70324kb
input:
199 100 70
output:
914653136
result:
ok 1 number(s): "914653136"
Test #12:
score: 0
Accepted
time: 4ms
memory: 70580kb
input:
187 3 40
output:
928785584
result:
ok 1 number(s): "928785584"
Test #13:
score: 0
Accepted
time: 0ms
memory: 70564kb
input:
199 198 197
output:
38412688
result:
ok 1 number(s): "38412688"
Test #14:
score: 0
Accepted
time: 8ms
memory: 70352kb
input:
200 40 140
output:
367088143
result:
ok 1 number(s): "367088143"
Test #15:
score: 0
Accepted
time: 0ms
memory: 70584kb
input:
199 111 3
output:
870834793
result:
ok 1 number(s): "870834793"
Test #16:
score: 0
Accepted
time: 11ms
memory: 70552kb
input:
200 133 73
output:
343127012
result:
ok 1 number(s): "343127012"
Test #17:
score: 0
Accepted
time: 3ms
memory: 70356kb
input:
178 15 163
output:
160852284
result:
ok 1 number(s): "160852284"
Test #18:
score: 0
Accepted
time: 0ms
memory: 70396kb
input:
197 43 79
output:
332057544
result:
ok 1 number(s): "332057544"
Test #19:
score: 0
Accepted
time: 7ms
memory: 70556kb
input:
200 33 79
output:
742545318
result:
ok 1 number(s): "742545318"
Subtask #4:
score: 49
Accepted
Dependency #1:
100%
Accepted
Dependency #2:
100%
Accepted
Dependency #3:
100%
Accepted
Test #20:
score: 49
Accepted
time: 11ms
memory: 70324kb
input:
658 169 438
output:
206087110
result:
ok 1 number(s): "206087110"
Test #21:
score: 0
Accepted
time: 11ms
memory: 70364kb
input:
700 207 509
output:
478311263
result:
ok 1 number(s): "478311263"
Test #22:
score: 0
Accepted
time: 7ms
memory: 70372kb
input:
755 139 507
output:
103783948
result:
ok 1 number(s): "103783948"
Test #23:
score: 0
Accepted
time: 36ms
memory: 70696kb
input:
2000 500 1500
output:
123410309
result:
ok 1 number(s): "123410309"
Test #24:
score: 0
Accepted
time: 46ms
memory: 70464kb
input:
2000 1000 1001
output:
956197482
result:
ok 1 number(s): "956197482"
Test #25:
score: 0
Accepted
time: 39ms
memory: 70468kb
input:
2000 666 1333
output:
993781645
result:
ok 1 number(s): "993781645"
Test #26:
score: 0
Accepted
time: 31ms
memory: 70544kb
input:
1991 198 677
output:
155058730
result:
ok 1 number(s): "155058730"
Test #27:
score: 0
Accepted
time: 21ms
memory: 70516kb
input:
1498 299 659
output:
665757882
result:
ok 1 number(s): "665757882"