#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int md = (int)1e9 + 7;
int main() {
ios::sync_with_stdio(false); cin.tie(nullptr);
int n;
cin >> n;
vector<int> a(n), b(n);
for (int i = 0; i < n; i++) cin >> a[i] >> b[i];
map<int, int> m;
for (int i = 0; i < n; i++) {
int x = (m.empty() || a[i] <= (*m.begin()).first ? 0 : (*--m.lower_bound(a[i])).second);
if (m.find(a[i]) == m.end()) m[a[i]] = x;
for (int j = a[i] + 1; j <= b[i]; j++) {
if (m.find(j) == m.end()) m[j] = m[j - 1];
}
for (int j = a[i]; j <= b[i]; j++) {
int y = m[j];
m[j] = (m[j] + x + 1) % md;
x = y;
}
}
int sm = 0;
for (auto i : m) sm = (sm + i.second) % md;
cout << sm;
}
/*sub1
vector<int> dp(n);
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[i] + dp[j]) % md;
}
}
int sm = 0;
for (auto i : dp) sm = (sm + i) % md;
cout << sm;
*/
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Execution timed out |
2060 ms |
208492 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |