#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
const ll MAX = 1007, MOD = 1E9 + 7;
ll L[MAX], R[MAX], F[MAX], IF[MAX], C[MAX], all[MAX], temp[MAX];
vector<int> S[MAX];
ll Pow(ll N, ll K) {
ll ret = 1;
while (K) {
if (K & 1) ret = ret * N % MOD;
N = N * N % MOD;
K >>= 1LL;
}
return ret;
}
ll Comb(ll N, ll K) {
ll ret = IF[K];
for (ll j = N; j > N - K; --j) ret = (ret * j) % MOD;
return ret;
}
int main() {
F[0] = IF[0] = 1;
for (ll i = 1; i < MAX; ++i) {
F[i] = F[i - 1] * i % MOD;
IF[i] = Pow(F[i], MOD - 2);
}
ios::sync_with_stdio(0); cin.tie(0);
int N;
cin >> N;
vector<int> T;
for (int i = 1; i <= N; ++i) {
cin >> L[i] >> R[i];
T.push_back(L[i]);
T.push_back(R[i] + 1);
}
T.push_back(0);
sort(T.begin(), T.end());
T.erase(unique(T.begin(), T.end()), T.end());
for (int i = 1; i <= N; ++i) {
int l = lower_bound(T.begin(), T.end(), L[i]) - T.begin();
int r = lower_bound(T.begin(), T.end(), R[i] + 1) - T.begin();
for (int j = l; j < r; ++j) S[j].push_back(i);
}
all[0] = 1;
for (int i = 1; i + 1 < T.size(); ++i) {
memset(temp, 0, sizeof(temp));
ll z = T[i + 1] - T[i];
ll pv = 0, idx = 0;
for (int a = 0; a < S[i].size(); ++a) C[a] = Comb(z + a, a + 1);
for (int a = 0; a < S[i].size(); ++a) {
while (idx < S[i][a]) pv = (pv + all[idx++]) % MOD;
for (int b = a; b < S[i].size(); ++b) {
temp[S[i][b]] = (temp[S[i][b]] + pv * C[b - a]) % MOD;
}
pv = 0;
}
for (int j = 0; j < MAX; ++j) all[j] = (all[j] + temp[j]) % MOD;
}
ll ans = accumulate(all + 1, all + MAX, 0LL) % MOD;
cout << ans;
return 0;
}
Compilation message
boat.cpp: In function 'int main()':
boat.cpp:52:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
52 | for (int i = 1; i + 1 < T.size(); ++i) {
| ~~~~~~^~~~~~~~~~
boat.cpp:56:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
56 | for (int a = 0; a < S[i].size(); ++a) C[a] = Comb(z + a, a + 1);
| ~~^~~~~~~~~~~~~
boat.cpp:58:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
58 | for (int a = 0; a < S[i].size(); ++a) {
| ~~^~~~~~~~~~~~~
boat.cpp:60:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
60 | for (int b = a; b < S[i].size(); ++b) {
| ~~^~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
348 KB |
Output is correct |
| 2 |
Correct |
3 ms |
348 KB |
Output is correct |
| 3 |
Correct |
3 ms |
348 KB |
Output is correct |
| 4 |
Correct |
3 ms |
348 KB |
Output is correct |
| 5 |
Correct |
3 ms |
348 KB |
Output is correct |
| 6 |
Correct |
3 ms |
568 KB |
Output is correct |
| 7 |
Correct |
3 ms |
512 KB |
Output is correct |
| 8 |
Correct |
3 ms |
596 KB |
Output is correct |
| 9 |
Correct |
3 ms |
344 KB |
Output is correct |
| 10 |
Correct |
2 ms |
348 KB |
Output is correct |
| 11 |
Correct |
3 ms |
348 KB |
Output is correct |
| 12 |
Correct |
3 ms |
600 KB |
Output is correct |
| 13 |
Correct |
3 ms |
348 KB |
Output is correct |
| 14 |
Correct |
3 ms |
564 KB |
Output is correct |
| 15 |
Correct |
3 ms |
348 KB |
Output is correct |
| 16 |
Correct |
1 ms |
348 KB |
Output is correct |
| 17 |
Correct |
1 ms |
348 KB |
Output is correct |
| 18 |
Correct |
1 ms |
348 KB |
Output is correct |
| 19 |
Correct |
1 ms |
348 KB |
Output is correct |
| 20 |
Correct |
1 ms |
348 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
348 KB |
Output is correct |
| 2 |
Correct |
3 ms |
348 KB |
Output is correct |
| 3 |
Correct |
3 ms |
348 KB |
Output is correct |
| 4 |
Correct |
3 ms |
348 KB |
Output is correct |
| 5 |
Correct |
3 ms |
348 KB |
Output is correct |
| 6 |
Correct |
3 ms |
568 KB |
Output is correct |
| 7 |
Correct |
3 ms |
512 KB |
Output is correct |
| 8 |
Correct |
3 ms |
596 KB |
Output is correct |
| 9 |
Correct |
3 ms |
344 KB |
Output is correct |
| 10 |
Correct |
2 ms |
348 KB |
Output is correct |
| 11 |
Correct |
3 ms |
348 KB |
Output is correct |
| 12 |
Correct |
3 ms |
600 KB |
Output is correct |
| 13 |
Correct |
3 ms |
348 KB |
Output is correct |
| 14 |
Correct |
3 ms |
564 KB |
Output is correct |
| 15 |
Correct |
3 ms |
348 KB |
Output is correct |
| 16 |
Correct |
1 ms |
348 KB |
Output is correct |
| 17 |
Correct |
1 ms |
348 KB |
Output is correct |
| 18 |
Correct |
1 ms |
348 KB |
Output is correct |
| 19 |
Correct |
1 ms |
348 KB |
Output is correct |
| 20 |
Correct |
1 ms |
348 KB |
Output is correct |
| 21 |
Correct |
99 ms |
1468 KB |
Output is correct |
| 22 |
Correct |
97 ms |
1368 KB |
Output is correct |
| 23 |
Correct |
83 ms |
1368 KB |
Output is correct |
| 24 |
Correct |
97 ms |
1372 KB |
Output is correct |
| 25 |
Correct |
96 ms |
1368 KB |
Output is correct |
| 26 |
Correct |
214 ms |
1732 KB |
Output is correct |
| 27 |
Correct |
219 ms |
1768 KB |
Output is correct |
| 28 |
Correct |
216 ms |
1872 KB |
Output is correct |
| 29 |
Correct |
213 ms |
1720 KB |
Output is correct |
| 30 |
Correct |
3 ms |
348 KB |
Output is correct |
| 31 |
Correct |
3 ms |
348 KB |
Output is correct |
| 32 |
Correct |
3 ms |
348 KB |
Output is correct |
| 33 |
Correct |
3 ms |
348 KB |
Output is correct |
| 34 |
Correct |
3 ms |
348 KB |
Output is correct |
| 35 |
Correct |
3 ms |
348 KB |
Output is correct |
| 36 |
Correct |
4 ms |
348 KB |
Output is correct |
| 37 |
Correct |
3 ms |
348 KB |
Output is correct |
| 38 |
Correct |
3 ms |
344 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
348 KB |
Output is correct |
| 2 |
Correct |
2 ms |
348 KB |
Output is correct |
| 3 |
Correct |
2 ms |
504 KB |
Output is correct |
| 4 |
Correct |
2 ms |
348 KB |
Output is correct |
| 5 |
Correct |
2 ms |
348 KB |
Output is correct |
| 6 |
Correct |
3 ms |
348 KB |
Output is correct |
| 7 |
Correct |
3 ms |
604 KB |
Output is correct |
| 8 |
Correct |
3 ms |
604 KB |
Output is correct |
| 9 |
Correct |
3 ms |
604 KB |
Output is correct |
| 10 |
Correct |
3 ms |
604 KB |
Output is correct |
| 11 |
Correct |
2 ms |
500 KB |
Output is correct |
| 12 |
Correct |
1 ms |
348 KB |
Output is correct |
| 13 |
Correct |
2 ms |
348 KB |
Output is correct |
| 14 |
Correct |
2 ms |
348 KB |
Output is correct |
| 15 |
Correct |
2 ms |
348 KB |
Output is correct |
| 16 |
Correct |
1 ms |
348 KB |
Output is correct |
| 17 |
Correct |
1 ms |
348 KB |
Output is correct |
| 18 |
Correct |
2 ms |
348 KB |
Output is correct |
| 19 |
Correct |
1 ms |
348 KB |
Output is correct |
| 20 |
Correct |
2 ms |
348 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
348 KB |
Output is correct |
| 2 |
Correct |
3 ms |
348 KB |
Output is correct |
| 3 |
Correct |
3 ms |
348 KB |
Output is correct |
| 4 |
Correct |
3 ms |
348 KB |
Output is correct |
| 5 |
Correct |
3 ms |
348 KB |
Output is correct |
| 6 |
Correct |
3 ms |
568 KB |
Output is correct |
| 7 |
Correct |
3 ms |
512 KB |
Output is correct |
| 8 |
Correct |
3 ms |
596 KB |
Output is correct |
| 9 |
Correct |
3 ms |
344 KB |
Output is correct |
| 10 |
Correct |
2 ms |
348 KB |
Output is correct |
| 11 |
Correct |
3 ms |
348 KB |
Output is correct |
| 12 |
Correct |
3 ms |
600 KB |
Output is correct |
| 13 |
Correct |
3 ms |
348 KB |
Output is correct |
| 14 |
Correct |
3 ms |
564 KB |
Output is correct |
| 15 |
Correct |
3 ms |
348 KB |
Output is correct |
| 16 |
Correct |
1 ms |
348 KB |
Output is correct |
| 17 |
Correct |
1 ms |
348 KB |
Output is correct |
| 18 |
Correct |
1 ms |
348 KB |
Output is correct |
| 19 |
Correct |
1 ms |
348 KB |
Output is correct |
| 20 |
Correct |
1 ms |
348 KB |
Output is correct |
| 21 |
Correct |
99 ms |
1468 KB |
Output is correct |
| 22 |
Correct |
97 ms |
1368 KB |
Output is correct |
| 23 |
Correct |
83 ms |
1368 KB |
Output is correct |
| 24 |
Correct |
97 ms |
1372 KB |
Output is correct |
| 25 |
Correct |
96 ms |
1368 KB |
Output is correct |
| 26 |
Correct |
214 ms |
1732 KB |
Output is correct |
| 27 |
Correct |
219 ms |
1768 KB |
Output is correct |
| 28 |
Correct |
216 ms |
1872 KB |
Output is correct |
| 29 |
Correct |
213 ms |
1720 KB |
Output is correct |
| 30 |
Correct |
3 ms |
348 KB |
Output is correct |
| 31 |
Correct |
3 ms |
348 KB |
Output is correct |
| 32 |
Correct |
3 ms |
348 KB |
Output is correct |
| 33 |
Correct |
3 ms |
348 KB |
Output is correct |
| 34 |
Correct |
3 ms |
348 KB |
Output is correct |
| 35 |
Correct |
3 ms |
348 KB |
Output is correct |
| 36 |
Correct |
4 ms |
348 KB |
Output is correct |
| 37 |
Correct |
3 ms |
348 KB |
Output is correct |
| 38 |
Correct |
3 ms |
344 KB |
Output is correct |
| 39 |
Correct |
2 ms |
348 KB |
Output is correct |
| 40 |
Correct |
2 ms |
348 KB |
Output is correct |
| 41 |
Correct |
2 ms |
504 KB |
Output is correct |
| 42 |
Correct |
2 ms |
348 KB |
Output is correct |
| 43 |
Correct |
2 ms |
348 KB |
Output is correct |
| 44 |
Correct |
3 ms |
348 KB |
Output is correct |
| 45 |
Correct |
3 ms |
604 KB |
Output is correct |
| 46 |
Correct |
3 ms |
604 KB |
Output is correct |
| 47 |
Correct |
3 ms |
604 KB |
Output is correct |
| 48 |
Correct |
3 ms |
604 KB |
Output is correct |
| 49 |
Correct |
2 ms |
500 KB |
Output is correct |
| 50 |
Correct |
1 ms |
348 KB |
Output is correct |
| 51 |
Correct |
2 ms |
348 KB |
Output is correct |
| 52 |
Correct |
2 ms |
348 KB |
Output is correct |
| 53 |
Correct |
2 ms |
348 KB |
Output is correct |
| 54 |
Correct |
1 ms |
348 KB |
Output is correct |
| 55 |
Correct |
1 ms |
348 KB |
Output is correct |
| 56 |
Correct |
2 ms |
348 KB |
Output is correct |
| 57 |
Correct |
1 ms |
348 KB |
Output is correct |
| 58 |
Correct |
2 ms |
348 KB |
Output is correct |
| 59 |
Correct |
107 ms |
1372 KB |
Output is correct |
| 60 |
Correct |
97 ms |
1448 KB |
Output is correct |
| 61 |
Correct |
90 ms |
1436 KB |
Output is correct |
| 62 |
Correct |
109 ms |
1628 KB |
Output is correct |
| 63 |
Correct |
101 ms |
1368 KB |
Output is correct |
| 64 |
Correct |
257 ms |
1904 KB |
Output is correct |
| 65 |
Correct |
244 ms |
1900 KB |
Output is correct |
| 66 |
Correct |
251 ms |
1904 KB |
Output is correct |
| 67 |
Correct |
245 ms |
2128 KB |
Output is correct |
| 68 |
Correct |
245 ms |
1884 KB |
Output is correct |
| 69 |
Correct |
90 ms |
1368 KB |
Output is correct |
| 70 |
Correct |
96 ms |
1620 KB |
Output is correct |
| 71 |
Correct |
95 ms |
1372 KB |
Output is correct |
| 72 |
Correct |
97 ms |
1416 KB |
Output is correct |
| 73 |
Correct |
97 ms |
1368 KB |
Output is correct |
| 74 |
Correct |
21 ms |
600 KB |
Output is correct |
| 75 |
Correct |
20 ms |
600 KB |
Output is correct |
| 76 |
Correct |
21 ms |
600 KB |
Output is correct |
| 77 |
Correct |
22 ms |
600 KB |
Output is correct |
| 78 |
Correct |
22 ms |
604 KB |
Output is correct |
