#include <bits/stdc++.h>
using namespace std;
vector<int> press;
int n;
typedef pair<int,int> P;
P arr[501];
long long psum[501];
long long save[501];
const int mod=1e9+7;
long long value[501];
long long fastpow(long long a,long long b) {
if (b==0) {
return 1;
}
if (b%2==1) {
return (fastpow(a,b-1)*a)%mod;
}
long long half=fastpow(a,b/2);
return (half*half)%mod;
}
int main(void) {
scanf("%d",&n);
press.push_back(1);
for(int i=1;i<=n;i++) {
int a,b;
scanf("%d %d",&a,&b);
arr[i]=P(a,b);
press.push_back(a);
press.push_back(b+1);
}
sort(press.begin(),press.end());
press.erase(unique(press.begin(),press.end()),press.end());
for(int i=1;i<=n;i++) {
arr[i].first=lower_bound(press.begin(),press.end(),arr[i].first)-press.begin()+1;
arr[i].second=lower_bound(press.begin(),press.end(),arr[i].second+1)-press.begin();
}
for(int i=0;i<n;i++) {
psum[i]=1;
}
for(int i=1;i<press.size();i++) {
int sz=press[i]-press[i-1];
value[0]=sz;
for(int j=1;j<=n;j++) {
value[j]=(value[j-1]*(sz+j))%mod;
value[j]*=fastpow(j+1,mod-2);
value[j]%=mod;
}
vector<long long> v;
save[0]=0;
for(int j=1;j<=n;j++) {
if (arr[j].first<=i&&i<=arr[j].second) {
v.insert(v.begin(),psum[j-1]);
}
save[j]=0;
for(int k=0;k<v.size();k++) {
save[j]+=(value[k]*v[k])%mod;
save[j]%=mod;
}
}
for(int j=0;j<=n;j++) {
//printf("%lld ",save[j]);
psum[j]+=save[j];
psum[j]%=mod;
}
//printf("\n");
}
printf("%lld",psum[n]);
}
Compilation message
boat.cpp: In function 'int main()':
boat.cpp:43:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
43 | for(int i=1;i<press.size();i++) {
| ~^~~~~~~~~~~~~
boat.cpp:58:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
58 | for(int k=0;k<v.size();k++) {
| ~^~~~~~~~~
boat.cpp:25:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
25 | scanf("%d",&n);
| ~~~~~^~~~~~~~~
boat.cpp:29:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
29 | scanf("%d %d",&a,&b);
| ~~~~~^~~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
149 ms |
292 KB |
Output is correct |
| 2 |
Correct |
149 ms |
204 KB |
Output is correct |
| 3 |
Correct |
151 ms |
300 KB |
Output is correct |
| 4 |
Correct |
149 ms |
204 KB |
Output is correct |
| 5 |
Correct |
150 ms |
288 KB |
Output is correct |
| 6 |
Correct |
147 ms |
300 KB |
Output is correct |
| 7 |
Correct |
148 ms |
292 KB |
Output is correct |
| 8 |
Correct |
150 ms |
204 KB |
Output is correct |
| 9 |
Correct |
160 ms |
204 KB |
Output is correct |
| 10 |
Correct |
150 ms |
292 KB |
Output is correct |
| 11 |
Correct |
147 ms |
204 KB |
Output is correct |
| 12 |
Correct |
149 ms |
204 KB |
Output is correct |
| 13 |
Correct |
147 ms |
292 KB |
Output is correct |
| 14 |
Correct |
149 ms |
292 KB |
Output is correct |
| 15 |
Correct |
150 ms |
288 KB |
Output is correct |
| 16 |
Correct |
28 ms |
308 KB |
Output is correct |
| 17 |
Correct |
29 ms |
288 KB |
Output is correct |
| 18 |
Correct |
29 ms |
296 KB |
Output is correct |
| 19 |
Correct |
29 ms |
204 KB |
Output is correct |
| 20 |
Correct |
30 ms |
204 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
149 ms |
292 KB |
Output is correct |
| 2 |
Correct |
149 ms |
204 KB |
Output is correct |
| 3 |
Correct |
151 ms |
300 KB |
Output is correct |
| 4 |
Correct |
149 ms |
204 KB |
Output is correct |
| 5 |
Correct |
150 ms |
288 KB |
Output is correct |
| 6 |
Correct |
147 ms |
300 KB |
Output is correct |
| 7 |
Correct |
148 ms |
292 KB |
Output is correct |
| 8 |
Correct |
150 ms |
204 KB |
Output is correct |
| 9 |
Correct |
160 ms |
204 KB |
Output is correct |
| 10 |
Correct |
150 ms |
292 KB |
Output is correct |
| 11 |
Correct |
147 ms |
204 KB |
Output is correct |
| 12 |
Correct |
149 ms |
204 KB |
Output is correct |
| 13 |
Correct |
147 ms |
292 KB |
Output is correct |
| 14 |
Correct |
149 ms |
292 KB |
Output is correct |
| 15 |
Correct |
150 ms |
288 KB |
Output is correct |
| 16 |
Correct |
28 ms |
308 KB |
Output is correct |
| 17 |
Correct |
29 ms |
288 KB |
Output is correct |
| 18 |
Correct |
29 ms |
296 KB |
Output is correct |
| 19 |
Correct |
29 ms |
204 KB |
Output is correct |
| 20 |
Correct |
30 ms |
204 KB |
Output is correct |
| 21 |
Correct |
323 ms |
308 KB |
Output is correct |
| 22 |
Correct |
334 ms |
308 KB |
Output is correct |
| 23 |
Correct |
311 ms |
304 KB |
Output is correct |
| 24 |
Correct |
331 ms |
300 KB |
Output is correct |
| 25 |
Correct |
341 ms |
204 KB |
Output is correct |
| 26 |
Correct |
414 ms |
304 KB |
Output is correct |
| 27 |
Correct |
413 ms |
300 KB |
Output is correct |
| 28 |
Correct |
410 ms |
304 KB |
Output is correct |
| 29 |
Correct |
400 ms |
300 KB |
Output is correct |
| 30 |
Correct |
156 ms |
324 KB |
Output is correct |
| 31 |
Correct |
148 ms |
312 KB |
Output is correct |
| 32 |
Correct |
150 ms |
312 KB |
Output is correct |
| 33 |
Correct |
162 ms |
324 KB |
Output is correct |
| 34 |
Correct |
148 ms |
320 KB |
Output is correct |
| 35 |
Correct |
150 ms |
204 KB |
Output is correct |
| 36 |
Correct |
151 ms |
304 KB |
Output is correct |
| 37 |
Correct |
152 ms |
300 KB |
Output is correct |
| 38 |
Correct |
152 ms |
300 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
8 ms |
204 KB |
Output is correct |
| 2 |
Correct |
9 ms |
204 KB |
Output is correct |
| 3 |
Correct |
8 ms |
204 KB |
Output is correct |
| 4 |
Correct |
8 ms |
204 KB |
Output is correct |
| 5 |
Correct |
8 ms |
204 KB |
Output is correct |
| 6 |
Correct |
9 ms |
312 KB |
Output is correct |
| 7 |
Correct |
10 ms |
204 KB |
Output is correct |
| 8 |
Correct |
9 ms |
204 KB |
Output is correct |
| 9 |
Correct |
9 ms |
312 KB |
Output is correct |
| 10 |
Correct |
11 ms |
332 KB |
Output is correct |
| 11 |
Correct |
9 ms |
308 KB |
Output is correct |
| 12 |
Correct |
8 ms |
308 KB |
Output is correct |
| 13 |
Correct |
10 ms |
204 KB |
Output is correct |
| 14 |
Correct |
8 ms |
204 KB |
Output is correct |
| 15 |
Correct |
8 ms |
204 KB |
Output is correct |
| 16 |
Correct |
5 ms |
204 KB |
Output is correct |
| 17 |
Correct |
5 ms |
204 KB |
Output is correct |
| 18 |
Correct |
5 ms |
308 KB |
Output is correct |
| 19 |
Correct |
6 ms |
300 KB |
Output is correct |
| 20 |
Correct |
5 ms |
204 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
149 ms |
292 KB |
Output is correct |
| 2 |
Correct |
149 ms |
204 KB |
Output is correct |
| 3 |
Correct |
151 ms |
300 KB |
Output is correct |
| 4 |
Correct |
149 ms |
204 KB |
Output is correct |
| 5 |
Correct |
150 ms |
288 KB |
Output is correct |
| 6 |
Correct |
147 ms |
300 KB |
Output is correct |
| 7 |
Correct |
148 ms |
292 KB |
Output is correct |
| 8 |
Correct |
150 ms |
204 KB |
Output is correct |
| 9 |
Correct |
160 ms |
204 KB |
Output is correct |
| 10 |
Correct |
150 ms |
292 KB |
Output is correct |
| 11 |
Correct |
147 ms |
204 KB |
Output is correct |
| 12 |
Correct |
149 ms |
204 KB |
Output is correct |
| 13 |
Correct |
147 ms |
292 KB |
Output is correct |
| 14 |
Correct |
149 ms |
292 KB |
Output is correct |
| 15 |
Correct |
150 ms |
288 KB |
Output is correct |
| 16 |
Correct |
28 ms |
308 KB |
Output is correct |
| 17 |
Correct |
29 ms |
288 KB |
Output is correct |
| 18 |
Correct |
29 ms |
296 KB |
Output is correct |
| 19 |
Correct |
29 ms |
204 KB |
Output is correct |
| 20 |
Correct |
30 ms |
204 KB |
Output is correct |
| 21 |
Correct |
323 ms |
308 KB |
Output is correct |
| 22 |
Correct |
334 ms |
308 KB |
Output is correct |
| 23 |
Correct |
311 ms |
304 KB |
Output is correct |
| 24 |
Correct |
331 ms |
300 KB |
Output is correct |
| 25 |
Correct |
341 ms |
204 KB |
Output is correct |
| 26 |
Correct |
414 ms |
304 KB |
Output is correct |
| 27 |
Correct |
413 ms |
300 KB |
Output is correct |
| 28 |
Correct |
410 ms |
304 KB |
Output is correct |
| 29 |
Correct |
400 ms |
300 KB |
Output is correct |
| 30 |
Correct |
156 ms |
324 KB |
Output is correct |
| 31 |
Correct |
148 ms |
312 KB |
Output is correct |
| 32 |
Correct |
150 ms |
312 KB |
Output is correct |
| 33 |
Correct |
162 ms |
324 KB |
Output is correct |
| 34 |
Correct |
148 ms |
320 KB |
Output is correct |
| 35 |
Correct |
150 ms |
204 KB |
Output is correct |
| 36 |
Correct |
151 ms |
304 KB |
Output is correct |
| 37 |
Correct |
152 ms |
300 KB |
Output is correct |
| 38 |
Correct |
152 ms |
300 KB |
Output is correct |
| 39 |
Correct |
8 ms |
204 KB |
Output is correct |
| 40 |
Correct |
9 ms |
204 KB |
Output is correct |
| 41 |
Correct |
8 ms |
204 KB |
Output is correct |
| 42 |
Correct |
8 ms |
204 KB |
Output is correct |
| 43 |
Correct |
8 ms |
204 KB |
Output is correct |
| 44 |
Correct |
9 ms |
312 KB |
Output is correct |
| 45 |
Correct |
10 ms |
204 KB |
Output is correct |
| 46 |
Correct |
9 ms |
204 KB |
Output is correct |
| 47 |
Correct |
9 ms |
312 KB |
Output is correct |
| 48 |
Correct |
11 ms |
332 KB |
Output is correct |
| 49 |
Correct |
9 ms |
308 KB |
Output is correct |
| 50 |
Correct |
8 ms |
308 KB |
Output is correct |
| 51 |
Correct |
10 ms |
204 KB |
Output is correct |
| 52 |
Correct |
8 ms |
204 KB |
Output is correct |
| 53 |
Correct |
8 ms |
204 KB |
Output is correct |
| 54 |
Correct |
5 ms |
204 KB |
Output is correct |
| 55 |
Correct |
5 ms |
204 KB |
Output is correct |
| 56 |
Correct |
5 ms |
308 KB |
Output is correct |
| 57 |
Correct |
6 ms |
300 KB |
Output is correct |
| 58 |
Correct |
5 ms |
204 KB |
Output is correct |
| 59 |
Correct |
372 ms |
308 KB |
Output is correct |
| 60 |
Correct |
351 ms |
204 KB |
Output is correct |
| 61 |
Correct |
350 ms |
204 KB |
Output is correct |
| 62 |
Correct |
374 ms |
312 KB |
Output is correct |
| 63 |
Correct |
355 ms |
304 KB |
Output is correct |
| 64 |
Correct |
462 ms |
204 KB |
Output is correct |
| 65 |
Correct |
496 ms |
308 KB |
Output is correct |
| 66 |
Correct |
463 ms |
204 KB |
Output is correct |
| 67 |
Correct |
491 ms |
324 KB |
Output is correct |
| 68 |
Correct |
474 ms |
204 KB |
Output is correct |
| 69 |
Correct |
373 ms |
304 KB |
Output is correct |
| 70 |
Correct |
384 ms |
204 KB |
Output is correct |
| 71 |
Correct |
389 ms |
300 KB |
Output is correct |
| 72 |
Correct |
390 ms |
308 KB |
Output is correct |
| 73 |
Correct |
399 ms |
324 KB |
Output is correct |
| 74 |
Correct |
77 ms |
204 KB |
Output is correct |
| 75 |
Correct |
72 ms |
204 KB |
Output is correct |
| 76 |
Correct |
70 ms |
304 KB |
Output is correct |
| 77 |
Correct |
68 ms |
204 KB |
Output is correct |
| 78 |
Correct |
67 ms |
304 KB |
Output is correct |
