#include <cassert>
#include <iostream>
using namespace std;
const int mod = 1000000007;
int n, a[509], b[509], dp[509];
int main() {
cin >> n;
for (int i = 0; i < n; i++) {
cin >> a[i] >> b[i];
assert(a[i] == b[i]);
}
int sum = 0;
for (int i = 0; i < n; i++) {
dp[i] = 1;
for (int j = 0; j < i; j++) {
if (a[j] < a[i]) {
dp[i] += dp[j];
if (dp[i] >= mod) dp[i] -= mod;
}
}
sum += dp[i];
if (sum >= mod) sum -= mod;
}
cout << sum << '\n';
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
376 KB |
Output is correct |
| 2 |
Correct |
3 ms |
376 KB |
Output is correct |
| 3 |
Correct |
3 ms |
448 KB |
Output is correct |
| 4 |
Correct |
3 ms |
512 KB |
Output is correct |
| 5 |
Correct |
3 ms |
524 KB |
Output is correct |
| 6 |
Correct |
3 ms |
536 KB |
Output is correct |
| 7 |
Correct |
2 ms |
580 KB |
Output is correct |
| 8 |
Correct |
2 ms |
592 KB |
Output is correct |
| 9 |
Correct |
3 ms |
604 KB |
Output is correct |
| 10 |
Correct |
3 ms |
616 KB |
Output is correct |
| 11 |
Correct |
2 ms |
628 KB |
Output is correct |
| 12 |
Correct |
2 ms |
768 KB |
Output is correct |
| 13 |
Correct |
3 ms |
768 KB |
Output is correct |
| 14 |
Correct |
3 ms |
768 KB |
Output is correct |
| 15 |
Correct |
3 ms |
768 KB |
Output is correct |
| 16 |
Correct |
3 ms |
768 KB |
Output is correct |
| 17 |
Correct |
3 ms |
768 KB |
Output is correct |
| 18 |
Correct |
3 ms |
768 KB |
Output is correct |
| 19 |
Correct |
3 ms |
768 KB |
Output is correct |
| 20 |
Correct |
3 ms |
768 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
376 KB |
Output is correct |
| 2 |
Correct |
3 ms |
376 KB |
Output is correct |
| 3 |
Correct |
3 ms |
448 KB |
Output is correct |
| 4 |
Correct |
3 ms |
512 KB |
Output is correct |
| 5 |
Correct |
3 ms |
524 KB |
Output is correct |
| 6 |
Correct |
3 ms |
536 KB |
Output is correct |
| 7 |
Correct |
2 ms |
580 KB |
Output is correct |
| 8 |
Correct |
2 ms |
592 KB |
Output is correct |
| 9 |
Correct |
3 ms |
604 KB |
Output is correct |
| 10 |
Correct |
3 ms |
616 KB |
Output is correct |
| 11 |
Correct |
2 ms |
628 KB |
Output is correct |
| 12 |
Correct |
2 ms |
768 KB |
Output is correct |
| 13 |
Correct |
3 ms |
768 KB |
Output is correct |
| 14 |
Correct |
3 ms |
768 KB |
Output is correct |
| 15 |
Correct |
3 ms |
768 KB |
Output is correct |
| 16 |
Correct |
3 ms |
768 KB |
Output is correct |
| 17 |
Correct |
3 ms |
768 KB |
Output is correct |
| 18 |
Correct |
3 ms |
768 KB |
Output is correct |
| 19 |
Correct |
3 ms |
768 KB |
Output is correct |
| 20 |
Correct |
3 ms |
768 KB |
Output is correct |
| 21 |
Runtime error |
2 ms |
876 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 22 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Runtime error |
2 ms |
900 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
376 KB |
Output is correct |
| 2 |
Correct |
3 ms |
376 KB |
Output is correct |
| 3 |
Correct |
3 ms |
448 KB |
Output is correct |
| 4 |
Correct |
3 ms |
512 KB |
Output is correct |
| 5 |
Correct |
3 ms |
524 KB |
Output is correct |
| 6 |
Correct |
3 ms |
536 KB |
Output is correct |
| 7 |
Correct |
2 ms |
580 KB |
Output is correct |
| 8 |
Correct |
2 ms |
592 KB |
Output is correct |
| 9 |
Correct |
3 ms |
604 KB |
Output is correct |
| 10 |
Correct |
3 ms |
616 KB |
Output is correct |
| 11 |
Correct |
2 ms |
628 KB |
Output is correct |
| 12 |
Correct |
2 ms |
768 KB |
Output is correct |
| 13 |
Correct |
3 ms |
768 KB |
Output is correct |
| 14 |
Correct |
3 ms |
768 KB |
Output is correct |
| 15 |
Correct |
3 ms |
768 KB |
Output is correct |
| 16 |
Correct |
3 ms |
768 KB |
Output is correct |
| 17 |
Correct |
3 ms |
768 KB |
Output is correct |
| 18 |
Correct |
3 ms |
768 KB |
Output is correct |
| 19 |
Correct |
3 ms |
768 KB |
Output is correct |
| 20 |
Correct |
3 ms |
768 KB |
Output is correct |
| 21 |
Runtime error |
2 ms |
876 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 22 |
Halted |
0 ms |
0 KB |
- |
