#include <bits/stdc++.h>
using namespace std;
const int MOD = 1e9 + 7;
int add (int a, int b) {
a += b; if (a >= MOD) a -= MOD;
return a;
}
int sub (int a, int b) {
a -= b; if (a < 0) a += MOD;
return a;
}
int mul (int a, int b) {
return (a * 1ll * b) % MOD;
}
int dp[300][300][27][2];
int n, m;
vector <pair <int, int>> dd[300];
int ans (int pos, int prev, int c, int x) {
int &ret = dp[pos][prev][c][x];
if (ret != -1) return ret;
bool flag = 1;
for (auto j : dd[pos]) {
if (j.second == 0) {
flag &= (prev >= j.first || x == 0);
} else {
flag &= (prev >= j.first || x == 1);
}
}
if (!flag) return ret = 0;
if (pos == 0) return ret = 1;
ret = ans(pos - 1, prev, c, x);
for (int i = 0; i < c; i++) {
ret = add(ret, ans(pos - 1, pos, i, 0));
}
for (int i = c + 1; i < 26; i++) {
ret = add(ret, ans(pos - 1, pos, i, 1));
}
return ret;
}
int main () {
memset(dp, -1, sizeof(dp));
cin >> n >> m;
for (int i = 1; i <= m; i++) {
int a, b;
cin >> a >> b;
int l = min(a, b), r = max(a, b);
if (a > b) {
dd[l - 1].push_back({r, 0});
} else {
dd[l - 1].push_back({r, 1});
}
}
int sum = 0;
for (int i = 0; i < 26; i++) {
sum = add(sum, ans(n - 1, n + 1, i, 0));
}
cout << sum << '\n';
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
19292 KB |
Output is correct |
2 |
Correct |
3 ms |
19308 KB |
Output is correct |
3 |
Correct |
3 ms |
19292 KB |
Output is correct |
4 |
Correct |
4 ms |
19472 KB |
Output is correct |
5 |
Correct |
3 ms |
19292 KB |
Output is correct |
6 |
Correct |
3 ms |
19292 KB |
Output is correct |
7 |
Correct |
4 ms |
19292 KB |
Output is correct |
8 |
Correct |
3 ms |
19292 KB |
Output is correct |
9 |
Correct |
3 ms |
19292 KB |
Output is correct |
10 |
Correct |
3 ms |
19292 KB |
Output is correct |
11 |
Correct |
4 ms |
19292 KB |
Output is correct |
12 |
Correct |
3 ms |
19292 KB |
Output is correct |
13 |
Correct |
3 ms |
19292 KB |
Output is correct |
14 |
Correct |
4 ms |
19292 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
19292 KB |
Output is correct |
2 |
Correct |
3 ms |
19308 KB |
Output is correct |
3 |
Correct |
3 ms |
19292 KB |
Output is correct |
4 |
Correct |
4 ms |
19472 KB |
Output is correct |
5 |
Correct |
3 ms |
19292 KB |
Output is correct |
6 |
Correct |
3 ms |
19292 KB |
Output is correct |
7 |
Correct |
4 ms |
19292 KB |
Output is correct |
8 |
Correct |
3 ms |
19292 KB |
Output is correct |
9 |
Correct |
3 ms |
19292 KB |
Output is correct |
10 |
Correct |
3 ms |
19292 KB |
Output is correct |
11 |
Correct |
4 ms |
19292 KB |
Output is correct |
12 |
Correct |
3 ms |
19292 KB |
Output is correct |
13 |
Correct |
3 ms |
19292 KB |
Output is correct |
14 |
Correct |
4 ms |
19292 KB |
Output is correct |
15 |
Correct |
25 ms |
19292 KB |
Output is correct |
16 |
Correct |
12 ms |
19292 KB |
Output is correct |
17 |
Correct |
7 ms |
19544 KB |
Output is correct |
18 |
Correct |
4 ms |
19292 KB |
Output is correct |
19 |
Correct |
6 ms |
19292 KB |
Output is correct |
20 |
Correct |
5 ms |
19292 KB |
Output is correct |
21 |
Correct |
5 ms |
19288 KB |
Output is correct |
22 |
Correct |
9 ms |
19548 KB |
Output is correct |
23 |
Correct |
46 ms |
19540 KB |
Output is correct |
24 |
Correct |
9 ms |
19292 KB |
Output is correct |
25 |
Correct |
4 ms |
19292 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
19288 KB |
Output is correct |
2 |
Correct |
3 ms |
19292 KB |
Output is correct |
3 |
Correct |
3 ms |
19288 KB |
Output is correct |
4 |
Correct |
4 ms |
19292 KB |
Output is correct |
5 |
Runtime error |
17 ms |
38956 KB |
Execution killed with signal 11 |
6 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
19292 KB |
Output is correct |
2 |
Correct |
3 ms |
19308 KB |
Output is correct |
3 |
Correct |
3 ms |
19292 KB |
Output is correct |
4 |
Correct |
4 ms |
19472 KB |
Output is correct |
5 |
Correct |
3 ms |
19292 KB |
Output is correct |
6 |
Correct |
3 ms |
19292 KB |
Output is correct |
7 |
Correct |
4 ms |
19292 KB |
Output is correct |
8 |
Correct |
3 ms |
19292 KB |
Output is correct |
9 |
Correct |
3 ms |
19292 KB |
Output is correct |
10 |
Correct |
3 ms |
19292 KB |
Output is correct |
11 |
Correct |
4 ms |
19292 KB |
Output is correct |
12 |
Correct |
3 ms |
19292 KB |
Output is correct |
13 |
Correct |
3 ms |
19292 KB |
Output is correct |
14 |
Correct |
4 ms |
19292 KB |
Output is correct |
15 |
Correct |
25 ms |
19292 KB |
Output is correct |
16 |
Correct |
12 ms |
19292 KB |
Output is correct |
17 |
Correct |
7 ms |
19544 KB |
Output is correct |
18 |
Correct |
4 ms |
19292 KB |
Output is correct |
19 |
Correct |
6 ms |
19292 KB |
Output is correct |
20 |
Correct |
5 ms |
19292 KB |
Output is correct |
21 |
Correct |
5 ms |
19288 KB |
Output is correct |
22 |
Correct |
9 ms |
19548 KB |
Output is correct |
23 |
Correct |
46 ms |
19540 KB |
Output is correct |
24 |
Correct |
9 ms |
19292 KB |
Output is correct |
25 |
Correct |
4 ms |
19292 KB |
Output is correct |
26 |
Runtime error |
18 ms |
39004 KB |
Execution killed with signal 11 |
27 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
19292 KB |
Output is correct |
2 |
Correct |
3 ms |
19308 KB |
Output is correct |
3 |
Correct |
3 ms |
19292 KB |
Output is correct |
4 |
Correct |
4 ms |
19472 KB |
Output is correct |
5 |
Correct |
3 ms |
19292 KB |
Output is correct |
6 |
Correct |
3 ms |
19292 KB |
Output is correct |
7 |
Correct |
4 ms |
19292 KB |
Output is correct |
8 |
Correct |
3 ms |
19292 KB |
Output is correct |
9 |
Correct |
3 ms |
19292 KB |
Output is correct |
10 |
Correct |
3 ms |
19292 KB |
Output is correct |
11 |
Correct |
4 ms |
19292 KB |
Output is correct |
12 |
Correct |
3 ms |
19292 KB |
Output is correct |
13 |
Correct |
3 ms |
19292 KB |
Output is correct |
14 |
Correct |
4 ms |
19292 KB |
Output is correct |
15 |
Correct |
25 ms |
19292 KB |
Output is correct |
16 |
Correct |
12 ms |
19292 KB |
Output is correct |
17 |
Correct |
7 ms |
19544 KB |
Output is correct |
18 |
Correct |
4 ms |
19292 KB |
Output is correct |
19 |
Correct |
6 ms |
19292 KB |
Output is correct |
20 |
Correct |
5 ms |
19292 KB |
Output is correct |
21 |
Correct |
5 ms |
19288 KB |
Output is correct |
22 |
Correct |
9 ms |
19548 KB |
Output is correct |
23 |
Correct |
46 ms |
19540 KB |
Output is correct |
24 |
Correct |
9 ms |
19292 KB |
Output is correct |
25 |
Correct |
4 ms |
19292 KB |
Output is correct |
26 |
Correct |
3 ms |
19288 KB |
Output is correct |
27 |
Correct |
3 ms |
19292 KB |
Output is correct |
28 |
Correct |
3 ms |
19288 KB |
Output is correct |
29 |
Correct |
4 ms |
19292 KB |
Output is correct |
30 |
Runtime error |
17 ms |
38956 KB |
Execution killed with signal 11 |
31 |
Halted |
0 ms |
0 KB |
- |