#include <bits/stdc++.h>
using namespace std;
const long long mod = 1E9 + 7;
int main() {
int n;
cin >> n;
vector<vector<long long>> pre_dp;
long long boat[n][2];
for (int i = 0; i < n; ++i) {
cin >> boat[i][0] >> boat[i][1];
pre_dp.push_back(vector<long long>(boat[i][1] - boat[i][0] + 1, 1));
}
long long answer = 0;
for (int i = 0; i < n; ++i) {
int sz = pre_dp[i].size();
for (int j = 0; j < sz; ++j) {
for (int k = 0; k < i; ++k) {
if (boat[i][0] + j > boat[k][1]) {
pre_dp[i][j] += pre_dp[k][boat[k][1] - boat[k][0]];
}
else if (boat[i][0] + j <= boat[k][0]) {
// do nothing
}
else {
pre_dp[i][j] += pre_dp[k][boat[i][0] + j - boat[k][0] - 1];
}
}
answer += pre_dp[i][j];
if (j) pre_dp[i][j] += pre_dp[i][j - 1];
pre_dp[i][j] %= mod;
}
answer %= mod;
}
answer %= mod;
cout << answer << '\n';
return 0;
}
/*
int main() {
int n;
cin >> n;
long long boat[n][2];
for (int i = 0; i < n; ++i) {
cin >> boat[i][0] >> boat[i][1];
}
long long dp[n], answer = 0;
for (int i = 0; i < n; ++i) {
dp[i] = 1;
for (int j = 0; j < i; ++j) {
if (boat[j][0] < boat[i][0]) {
dp[i] += dp[j];
}
}
dp[i] %= mod;
answer += dp[i];
}
answer %= mod;
cout << answer << '\n';
return 0;
}
*/
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
4 ms |
376 KB |
Output is correct |
2 |
Correct |
3 ms |
376 KB |
Output is correct |
3 |
Correct |
3 ms |
376 KB |
Output is correct |
4 |
Correct |
3 ms |
376 KB |
Output is correct |
5 |
Correct |
3 ms |
376 KB |
Output is correct |
6 |
Correct |
3 ms |
376 KB |
Output is correct |
7 |
Correct |
3 ms |
376 KB |
Output is correct |
8 |
Correct |
3 ms |
376 KB |
Output is correct |
9 |
Correct |
3 ms |
376 KB |
Output is correct |
10 |
Correct |
3 ms |
380 KB |
Output is correct |
11 |
Correct |
3 ms |
376 KB |
Output is correct |
12 |
Correct |
3 ms |
376 KB |
Output is correct |
13 |
Correct |
3 ms |
404 KB |
Output is correct |
14 |
Correct |
3 ms |
376 KB |
Output is correct |
15 |
Correct |
3 ms |
376 KB |
Output is correct |
16 |
Correct |
3 ms |
348 KB |
Output is correct |
17 |
Correct |
3 ms |
380 KB |
Output is correct |
18 |
Correct |
3 ms |
376 KB |
Output is correct |
19 |
Correct |
3 ms |
376 KB |
Output is correct |
20 |
Correct |
3 ms |
376 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
4 ms |
376 KB |
Output is correct |
2 |
Correct |
3 ms |
376 KB |
Output is correct |
3 |
Correct |
3 ms |
376 KB |
Output is correct |
4 |
Correct |
3 ms |
376 KB |
Output is correct |
5 |
Correct |
3 ms |
376 KB |
Output is correct |
6 |
Correct |
3 ms |
376 KB |
Output is correct |
7 |
Correct |
3 ms |
376 KB |
Output is correct |
8 |
Correct |
3 ms |
376 KB |
Output is correct |
9 |
Correct |
3 ms |
376 KB |
Output is correct |
10 |
Correct |
3 ms |
380 KB |
Output is correct |
11 |
Correct |
3 ms |
376 KB |
Output is correct |
12 |
Correct |
3 ms |
376 KB |
Output is correct |
13 |
Correct |
3 ms |
404 KB |
Output is correct |
14 |
Correct |
3 ms |
376 KB |
Output is correct |
15 |
Correct |
3 ms |
376 KB |
Output is correct |
16 |
Correct |
3 ms |
348 KB |
Output is correct |
17 |
Correct |
3 ms |
380 KB |
Output is correct |
18 |
Correct |
3 ms |
376 KB |
Output is correct |
19 |
Correct |
3 ms |
376 KB |
Output is correct |
20 |
Correct |
3 ms |
376 KB |
Output is correct |
21 |
Correct |
672 ms |
7232 KB |
Output is correct |
22 |
Correct |
693 ms |
7160 KB |
Output is correct |
23 |
Correct |
659 ms |
6904 KB |
Output is correct |
24 |
Correct |
731 ms |
7544 KB |
Output is correct |
25 |
Correct |
699 ms |
7516 KB |
Output is correct |
26 |
Correct |
661 ms |
7900 KB |
Output is correct |
27 |
Correct |
714 ms |
8056 KB |
Output is correct |
28 |
Correct |
714 ms |
7928 KB |
Output is correct |
29 |
Correct |
736 ms |
8088 KB |
Output is correct |
30 |
Correct |
712 ms |
8216 KB |
Output is correct |
31 |
Correct |
702 ms |
8184 KB |
Output is correct |
32 |
Correct |
712 ms |
8172 KB |
Output is correct |
33 |
Correct |
682 ms |
7972 KB |
Output is correct |
34 |
Correct |
678 ms |
8036 KB |
Output is correct |
35 |
Correct |
365 ms |
7672 KB |
Output is correct |
36 |
Correct |
434 ms |
7800 KB |
Output is correct |
37 |
Correct |
429 ms |
7928 KB |
Output is correct |
38 |
Correct |
448 ms |
7800 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
5 ms |
504 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 |
4 ms |
376 KB |
Output is correct |
2 |
Correct |
3 ms |
376 KB |
Output is correct |
3 |
Correct |
3 ms |
376 KB |
Output is correct |
4 |
Correct |
3 ms |
376 KB |
Output is correct |
5 |
Correct |
3 ms |
376 KB |
Output is correct |
6 |
Correct |
3 ms |
376 KB |
Output is correct |
7 |
Correct |
3 ms |
376 KB |
Output is correct |
8 |
Correct |
3 ms |
376 KB |
Output is correct |
9 |
Correct |
3 ms |
376 KB |
Output is correct |
10 |
Correct |
3 ms |
380 KB |
Output is correct |
11 |
Correct |
3 ms |
376 KB |
Output is correct |
12 |
Correct |
3 ms |
376 KB |
Output is correct |
13 |
Correct |
3 ms |
404 KB |
Output is correct |
14 |
Correct |
3 ms |
376 KB |
Output is correct |
15 |
Correct |
3 ms |
376 KB |
Output is correct |
16 |
Correct |
3 ms |
348 KB |
Output is correct |
17 |
Correct |
3 ms |
380 KB |
Output is correct |
18 |
Correct |
3 ms |
376 KB |
Output is correct |
19 |
Correct |
3 ms |
376 KB |
Output is correct |
20 |
Correct |
3 ms |
376 KB |
Output is correct |
21 |
Correct |
672 ms |
7232 KB |
Output is correct |
22 |
Correct |
693 ms |
7160 KB |
Output is correct |
23 |
Correct |
659 ms |
6904 KB |
Output is correct |
24 |
Correct |
731 ms |
7544 KB |
Output is correct |
25 |
Correct |
699 ms |
7516 KB |
Output is correct |
26 |
Correct |
661 ms |
7900 KB |
Output is correct |
27 |
Correct |
714 ms |
8056 KB |
Output is correct |
28 |
Correct |
714 ms |
7928 KB |
Output is correct |
29 |
Correct |
736 ms |
8088 KB |
Output is correct |
30 |
Correct |
712 ms |
8216 KB |
Output is correct |
31 |
Correct |
702 ms |
8184 KB |
Output is correct |
32 |
Correct |
712 ms |
8172 KB |
Output is correct |
33 |
Correct |
682 ms |
7972 KB |
Output is correct |
34 |
Correct |
678 ms |
8036 KB |
Output is correct |
35 |
Correct |
365 ms |
7672 KB |
Output is correct |
36 |
Correct |
434 ms |
7800 KB |
Output is correct |
37 |
Correct |
429 ms |
7928 KB |
Output is correct |
38 |
Correct |
448 ms |
7800 KB |
Output is correct |
39 |
Runtime error |
5 ms |
504 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
40 |
Halted |
0 ms |
0 KB |
- |