#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 ALL(x) x.begin(),x.end()
#define pb push_back
#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,a[maxn],b[maxn],dp[maxn],inv[maxn];
vector<int>p;
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,1,n+1)inv[i]=qp(i,mo-2);
REP(i,0,n)cin>>a[i]>>b[i],++b[i],p.pb(a[i]),p.pb(b[i]);
sort(ALL(p));
p.resize(unique(ALL(p))-p.begin());
REP(i,0,n)a[i]=find(ALL(p),a[i])-p.begin(),b[i]=find(ALL(p),b[i])-p.begin();
dp[0]=1;
REP(i,0,p.size()-1){
int l=p[i+1]-p[i];
RREP(j,n,0){
if(a[j]<=i&&i<b[j]){
int c=l,t=1;
RREP(k,j+1,0){
add(dp[j+1],c*dp[k]%mo);
if(k&&a[k-1]<=i&&i<b[k-1])c=c*(t+l)%mo*inv[t+1]%mo,++t;
}
}
}
}
int sum=0;
REP(i,0,n)add(sum,dp[i+1]);
cout<<sum<<endl;
}
Compilation message
boat.cpp:29:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
main(){
^
boat.cpp: In function 'int main()':
boat.cpp:6:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
#define REP(i,j,k) for(int i=(j);i<(k);++i)
^
boat.cpp:38:2: note: in expansion of macro 'REP'
REP(i,0,p.size()-1){
^~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
384 KB |
Output is correct |
| 2 |
Correct |
5 ms |
384 KB |
Output is correct |
| 3 |
Correct |
4 ms |
384 KB |
Output is correct |
| 4 |
Correct |
6 ms |
384 KB |
Output is correct |
| 5 |
Correct |
5 ms |
384 KB |
Output is correct |
| 6 |
Correct |
5 ms |
384 KB |
Output is correct |
| 7 |
Correct |
6 ms |
384 KB |
Output is correct |
| 8 |
Correct |
3 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 |
428 KB |
Output is correct |
| 12 |
Correct |
5 ms |
384 KB |
Output is correct |
| 13 |
Correct |
0 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 |
Correct |
4 ms |
384 KB |
Output is correct |
| 17 |
Correct |
4 ms |
384 KB |
Output is correct |
| 18 |
Correct |
4 ms |
384 KB |
Output is correct |
| 19 |
Correct |
20 ms |
384 KB |
Output is correct |
| 20 |
Correct |
4 ms |
384 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
384 KB |
Output is correct |
| 2 |
Correct |
5 ms |
384 KB |
Output is correct |
| 3 |
Correct |
4 ms |
384 KB |
Output is correct |
| 4 |
Correct |
6 ms |
384 KB |
Output is correct |
| 5 |
Correct |
5 ms |
384 KB |
Output is correct |
| 6 |
Correct |
5 ms |
384 KB |
Output is correct |
| 7 |
Correct |
6 ms |
384 KB |
Output is correct |
| 8 |
Correct |
3 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 |
428 KB |
Output is correct |
| 12 |
Correct |
5 ms |
384 KB |
Output is correct |
| 13 |
Correct |
0 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 |
Correct |
4 ms |
384 KB |
Output is correct |
| 17 |
Correct |
4 ms |
384 KB |
Output is correct |
| 18 |
Correct |
4 ms |
384 KB |
Output is correct |
| 19 |
Correct |
20 ms |
384 KB |
Output is correct |
| 20 |
Correct |
4 ms |
384 KB |
Output is correct |
| 21 |
Correct |
325 ms |
384 KB |
Output is correct |
| 22 |
Correct |
296 ms |
384 KB |
Output is correct |
| 23 |
Correct |
287 ms |
500 KB |
Output is correct |
| 24 |
Correct |
298 ms |
580 KB |
Output is correct |
| 25 |
Correct |
325 ms |
384 KB |
Output is correct |
| 26 |
Correct |
586 ms |
384 KB |
Output is correct |
| 27 |
Correct |
568 ms |
508 KB |
Output is correct |
| 28 |
Correct |
553 ms |
384 KB |
Output is correct |
| 29 |
Correct |
526 ms |
384 KB |
Output is correct |
| 30 |
Correct |
4 ms |
384 KB |
Output is correct |
| 31 |
Correct |
5 ms |
384 KB |
Output is correct |
| 32 |
Correct |
4 ms |
384 KB |
Output is correct |
| 33 |
Correct |
5 ms |
384 KB |
Output is correct |
| 34 |
Correct |
6 ms |
384 KB |
Output is correct |
| 35 |
Correct |
6 ms |
384 KB |
Output is correct |
| 36 |
Correct |
7 ms |
384 KB |
Output is correct |
| 37 |
Correct |
7 ms |
384 KB |
Output is correct |
| 38 |
Correct |
8 ms |
384 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
6 ms |
384 KB |
Output is correct |
| 2 |
Correct |
4 ms |
384 KB |
Output is correct |
| 3 |
Correct |
5 ms |
512 KB |
Output is correct |
| 4 |
Correct |
6 ms |
384 KB |
Output is correct |
| 5 |
Correct |
6 ms |
384 KB |
Output is correct |
| 6 |
Correct |
8 ms |
384 KB |
Output is correct |
| 7 |
Correct |
7 ms |
384 KB |
Output is correct |
| 8 |
Correct |
7 ms |
384 KB |
Output is correct |
| 9 |
Correct |
8 ms |
384 KB |
Output is correct |
| 10 |
Correct |
8 ms |
384 KB |
Output is correct |
| 11 |
Correct |
5 ms |
384 KB |
Output is correct |
| 12 |
Correct |
5 ms |
384 KB |
Output is correct |
| 13 |
Correct |
5 ms |
384 KB |
Output is correct |
| 14 |
Correct |
5 ms |
384 KB |
Output is correct |
| 15 |
Correct |
5 ms |
384 KB |
Output is correct |
| 16 |
Correct |
4 ms |
384 KB |
Output is correct |
| 17 |
Correct |
4 ms |
384 KB |
Output is correct |
| 18 |
Correct |
4 ms |
384 KB |
Output is correct |
| 19 |
Correct |
4 ms |
384 KB |
Output is correct |
| 20 |
Correct |
4 ms |
384 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
384 KB |
Output is correct |
| 2 |
Correct |
5 ms |
384 KB |
Output is correct |
| 3 |
Correct |
4 ms |
384 KB |
Output is correct |
| 4 |
Correct |
6 ms |
384 KB |
Output is correct |
| 5 |
Correct |
5 ms |
384 KB |
Output is correct |
| 6 |
Correct |
5 ms |
384 KB |
Output is correct |
| 7 |
Correct |
6 ms |
384 KB |
Output is correct |
| 8 |
Correct |
3 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 |
428 KB |
Output is correct |
| 12 |
Correct |
5 ms |
384 KB |
Output is correct |
| 13 |
Correct |
0 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 |
Correct |
4 ms |
384 KB |
Output is correct |
| 17 |
Correct |
4 ms |
384 KB |
Output is correct |
| 18 |
Correct |
4 ms |
384 KB |
Output is correct |
| 19 |
Correct |
20 ms |
384 KB |
Output is correct |
| 20 |
Correct |
4 ms |
384 KB |
Output is correct |
| 21 |
Correct |
325 ms |
384 KB |
Output is correct |
| 22 |
Correct |
296 ms |
384 KB |
Output is correct |
| 23 |
Correct |
287 ms |
500 KB |
Output is correct |
| 24 |
Correct |
298 ms |
580 KB |
Output is correct |
| 25 |
Correct |
325 ms |
384 KB |
Output is correct |
| 26 |
Correct |
586 ms |
384 KB |
Output is correct |
| 27 |
Correct |
568 ms |
508 KB |
Output is correct |
| 28 |
Correct |
553 ms |
384 KB |
Output is correct |
| 29 |
Correct |
526 ms |
384 KB |
Output is correct |
| 30 |
Correct |
4 ms |
384 KB |
Output is correct |
| 31 |
Correct |
5 ms |
384 KB |
Output is correct |
| 32 |
Correct |
4 ms |
384 KB |
Output is correct |
| 33 |
Correct |
5 ms |
384 KB |
Output is correct |
| 34 |
Correct |
6 ms |
384 KB |
Output is correct |
| 35 |
Correct |
6 ms |
384 KB |
Output is correct |
| 36 |
Correct |
7 ms |
384 KB |
Output is correct |
| 37 |
Correct |
7 ms |
384 KB |
Output is correct |
| 38 |
Correct |
8 ms |
384 KB |
Output is correct |
| 39 |
Correct |
6 ms |
384 KB |
Output is correct |
| 40 |
Correct |
4 ms |
384 KB |
Output is correct |
| 41 |
Correct |
5 ms |
512 KB |
Output is correct |
| 42 |
Correct |
6 ms |
384 KB |
Output is correct |
| 43 |
Correct |
6 ms |
384 KB |
Output is correct |
| 44 |
Correct |
8 ms |
384 KB |
Output is correct |
| 45 |
Correct |
7 ms |
384 KB |
Output is correct |
| 46 |
Correct |
7 ms |
384 KB |
Output is correct |
| 47 |
Correct |
8 ms |
384 KB |
Output is correct |
| 48 |
Correct |
8 ms |
384 KB |
Output is correct |
| 49 |
Correct |
5 ms |
384 KB |
Output is correct |
| 50 |
Correct |
5 ms |
384 KB |
Output is correct |
| 51 |
Correct |
5 ms |
384 KB |
Output is correct |
| 52 |
Correct |
5 ms |
384 KB |
Output is correct |
| 53 |
Correct |
5 ms |
384 KB |
Output is correct |
| 54 |
Correct |
4 ms |
384 KB |
Output is correct |
| 55 |
Correct |
4 ms |
384 KB |
Output is correct |
| 56 |
Correct |
4 ms |
384 KB |
Output is correct |
| 57 |
Correct |
4 ms |
384 KB |
Output is correct |
| 58 |
Correct |
4 ms |
384 KB |
Output is correct |
| 59 |
Correct |
346 ms |
416 KB |
Output is correct |
| 60 |
Correct |
302 ms |
508 KB |
Output is correct |
| 61 |
Correct |
303 ms |
504 KB |
Output is correct |
| 62 |
Correct |
349 ms |
512 KB |
Output is correct |
| 63 |
Correct |
313 ms |
512 KB |
Output is correct |
| 64 |
Correct |
670 ms |
504 KB |
Output is correct |
| 65 |
Correct |
729 ms |
384 KB |
Output is correct |
| 66 |
Correct |
639 ms |
504 KB |
Output is correct |
| 67 |
Correct |
627 ms |
508 KB |
Output is correct |
| 68 |
Correct |
617 ms |
504 KB |
Output is correct |
| 69 |
Correct |
260 ms |
504 KB |
Output is correct |
| 70 |
Correct |
262 ms |
384 KB |
Output is correct |
| 71 |
Correct |
281 ms |
504 KB |
Output is correct |
| 72 |
Correct |
264 ms |
384 KB |
Output is correct |
| 73 |
Correct |
296 ms |
412 KB |
Output is correct |
| 74 |
Correct |
74 ms |
384 KB |
Output is correct |
| 75 |
Correct |
66 ms |
384 KB |
Output is correct |
| 76 |
Correct |
69 ms |
384 KB |
Output is correct |
| 77 |
Correct |
78 ms |
384 KB |
Output is correct |
| 78 |
Correct |
74 ms |
416 KB |
Output is correct |
