#include "bits/stdc++.h"
using namespace std;
constexpr long long MOD = 1000000007;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
int N;
cin >> N;
vector<long long> A(N), B(N), X;
X.push_back(0);
for (int i = 0; i < N; i++) {
cin >> A[i] >> B[i];
B[i]++;
X.push_back(A[i]), X.push_back(B[i]);
}
sort(X.begin(), X.end());
X.erase(unique(X.begin(), X.end()), X.end());
for (int i = 0; i < N; i++) {
A[i] = lower_bound(X.begin(), X.end(), A[i]) - X.begin();
B[i] = lower_bound(X.begin(), X.end(), B[i]) - X.begin();
}
vector<vector<long long> > DP(N + 1, vector<long long>(X.size() - 1, 0));
DP[0][0] = 1;
for (int i = 0; i < N; i++) {
for (int j = 0; j < X.size() - 1; j++) DP[i + 1][j] = DP[i][j];
long long SUM = 0;
for (int j = 0; j < A[i]; j++) SUM += DP[i][j], SUM %= MOD;
for (int j = A[i]; j < B[i]; j++) {
DP[i + 1][j] += SUM * (X[j + 1] - X[j]);
DP[i + 1][j] %= MOD;
SUM += DP[i][j];
SUM %= MOD;
}
}
long long ANS = 0;
for (int j = 1; j < X.size() - 1; j++) {
ANS += DP[N][j];
ANS %= MOD;
}
cout << ANS << endl;
}
Compilation message
boat.cpp: In function 'int main()':
boat.cpp:27:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
27 | for (int j = 0; j < X.size() - 1; j++) DP[i + 1][j] = DP[i][j];
| ~~^~~~~~~~~~~~~~
boat.cpp:38:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
38 | for (int j = 1; j < X.size() - 1; j++) {
| ~~^~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 2 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 3 |
Correct |
5 ms |
4360 KB |
Output is correct |
| 4 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 5 |
Correct |
6 ms |
4352 KB |
Output is correct |
| 6 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 7 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 8 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 9 |
Correct |
4 ms |
4352 KB |
Output is correct |
| 10 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 11 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 12 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 13 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 14 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 15 |
Correct |
4 ms |
4352 KB |
Output is correct |
| 16 |
Correct |
1 ms |
1024 KB |
Output is correct |
| 17 |
Correct |
1 ms |
1152 KB |
Output is correct |
| 18 |
Correct |
1 ms |
1152 KB |
Output is correct |
| 19 |
Correct |
2 ms |
1152 KB |
Output is correct |
| 20 |
Correct |
1 ms |
1152 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 2 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 3 |
Correct |
5 ms |
4360 KB |
Output is correct |
| 4 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 5 |
Correct |
6 ms |
4352 KB |
Output is correct |
| 6 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 7 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 8 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 9 |
Correct |
4 ms |
4352 KB |
Output is correct |
| 10 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 11 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 12 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 13 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 14 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 15 |
Correct |
4 ms |
4352 KB |
Output is correct |
| 16 |
Correct |
1 ms |
1024 KB |
Output is correct |
| 17 |
Correct |
1 ms |
1152 KB |
Output is correct |
| 18 |
Correct |
1 ms |
1152 KB |
Output is correct |
| 19 |
Correct |
2 ms |
1152 KB |
Output is correct |
| 20 |
Correct |
1 ms |
1152 KB |
Output is correct |
| 21 |
Incorrect |
6 ms |
3968 KB |
Output isn't correct |
| 22 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
1 ms |
512 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 2 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 3 |
Correct |
5 ms |
4360 KB |
Output is correct |
| 4 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 5 |
Correct |
6 ms |
4352 KB |
Output is correct |
| 6 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 7 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 8 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 9 |
Correct |
4 ms |
4352 KB |
Output is correct |
| 10 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 11 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 12 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 13 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 14 |
Correct |
5 ms |
4352 KB |
Output is correct |
| 15 |
Correct |
4 ms |
4352 KB |
Output is correct |
| 16 |
Correct |
1 ms |
1024 KB |
Output is correct |
| 17 |
Correct |
1 ms |
1152 KB |
Output is correct |
| 18 |
Correct |
1 ms |
1152 KB |
Output is correct |
| 19 |
Correct |
2 ms |
1152 KB |
Output is correct |
| 20 |
Correct |
1 ms |
1152 KB |
Output is correct |
| 21 |
Incorrect |
6 ms |
3968 KB |
Output isn't correct |
| 22 |
Halted |
0 ms |
0 KB |
- |
