#include<bits/stdc++.h>
#include<stdint.h>
#define int int64_t
using namespace std;
typedef pair<int,int> pii;
#define REP(i,j,k) for(int i=(j);i<(k);++i)
#define RREP(i,j,k) for(int i=(j)-1;i>=(k);--i)
#define MST(a,v) memset(a,(v),sizeof a)
#define F first
#define S second
#define IOS cin.tie(0),ios_base::sync_with_stdio(false)
#define add(x,y) x=(x+y)%mo
const int maxn=509,mo=1e9L+7;
int n,q=0,a[maxn],b[maxn],dp[maxn];
pii p[2*maxn];
int qp(int x,int t){
int re=1;
while(t){
if(t&1)re=re*x%mo;
x=x*x%mo,t>>=1;
}
return re;
}
main(){
IOS;
cin>>n;
REP(i,0,n)cin>>a[i]>>b[i],++b[i],p[q++]=pii(a[i],0),p[q++]=pii(b[i],0);
sort(p,p+q);
q=unique(p,p+q)-p;
REP(i,0,q)p[i].S=i;
REP(i,0,n)a[i]=lower_bound(p,p+q,pii(a[i],0))->S,b[i]=lower_bound(p,p+q,pii(b[i],0))->S;
dp[0]=1;
REP(i,0,q-1){
REP(j,0,n){
int l=p[i+1].F-p[i].F;
if(a[j]<=i&&i<b[j]){
int c=l,t=1;
RREP(k,j+1,0){
add(dp[j+1],dp[k]*c%mo);
if(k&&a[k-1]<=i&&i<b[k-1])c=c*(k+l)%mo*qp(k+1,mo-2)%mo,++t;
}
}
}
}
int sum=0;
REP(i,0,n)add(sum,dp[i+1]);
cout<<sum<<endl;
}
Compilation message
boat.cpp:27:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
main(){
^
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
384 KB |
Output is correct |
| 2 |
Correct |
4 ms |
384 KB |
Output is correct |
| 3 |
Correct |
4 ms |
384 KB |
Output is correct |
| 4 |
Correct |
4 ms |
384 KB |
Output is correct |
| 5 |
Correct |
5 ms |
384 KB |
Output is correct |
| 6 |
Correct |
4 ms |
384 KB |
Output is correct |
| 7 |
Correct |
3 ms |
384 KB |
Output is correct |
| 8 |
Correct |
4 ms |
384 KB |
Output is correct |
| 9 |
Correct |
4 ms |
384 KB |
Output is correct |
| 10 |
Correct |
4 ms |
384 KB |
Output is correct |
| 11 |
Correct |
4 ms |
384 KB |
Output is correct |
| 12 |
Correct |
4 ms |
384 KB |
Output is correct |
| 13 |
Correct |
4 ms |
384 KB |
Output is correct |
| 14 |
Correct |
4 ms |
384 KB |
Output is correct |
| 15 |
Correct |
4 ms |
384 KB |
Output is correct |
| 16 |
Incorrect |
4 ms |
384 KB |
Output isn't correct |
| 17 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
384 KB |
Output is correct |
| 2 |
Correct |
4 ms |
384 KB |
Output is correct |
| 3 |
Correct |
4 ms |
384 KB |
Output is correct |
| 4 |
Correct |
4 ms |
384 KB |
Output is correct |
| 5 |
Correct |
5 ms |
384 KB |
Output is correct |
| 6 |
Correct |
4 ms |
384 KB |
Output is correct |
| 7 |
Correct |
3 ms |
384 KB |
Output is correct |
| 8 |
Correct |
4 ms |
384 KB |
Output is correct |
| 9 |
Correct |
4 ms |
384 KB |
Output is correct |
| 10 |
Correct |
4 ms |
384 KB |
Output is correct |
| 11 |
Correct |
4 ms |
384 KB |
Output is correct |
| 12 |
Correct |
4 ms |
384 KB |
Output is correct |
| 13 |
Correct |
4 ms |
384 KB |
Output is correct |
| 14 |
Correct |
4 ms |
384 KB |
Output is correct |
| 15 |
Correct |
4 ms |
384 KB |
Output is correct |
| 16 |
Incorrect |
4 ms |
384 KB |
Output isn't correct |
| 17 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
22 ms |
384 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
384 KB |
Output is correct |
| 2 |
Correct |
4 ms |
384 KB |
Output is correct |
| 3 |
Correct |
4 ms |
384 KB |
Output is correct |
| 4 |
Correct |
4 ms |
384 KB |
Output is correct |
| 5 |
Correct |
5 ms |
384 KB |
Output is correct |
| 6 |
Correct |
4 ms |
384 KB |
Output is correct |
| 7 |
Correct |
3 ms |
384 KB |
Output is correct |
| 8 |
Correct |
4 ms |
384 KB |
Output is correct |
| 9 |
Correct |
4 ms |
384 KB |
Output is correct |
| 10 |
Correct |
4 ms |
384 KB |
Output is correct |
| 11 |
Correct |
4 ms |
384 KB |
Output is correct |
| 12 |
Correct |
4 ms |
384 KB |
Output is correct |
| 13 |
Correct |
4 ms |
384 KB |
Output is correct |
| 14 |
Correct |
4 ms |
384 KB |
Output is correct |
| 15 |
Correct |
4 ms |
384 KB |
Output is correct |
| 16 |
Incorrect |
4 ms |
384 KB |
Output isn't correct |
| 17 |
Halted |
0 ms |
0 KB |
- |
