#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define mp make_pair
#define fi first
#define se second
using namespace std;
ll n,i,a[550],b[550],j,k,has,mo=1000000007;
int main()
{
//ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
cin>>n;
for(i=1;i<=n;i++)
{
cin>>a[i]>>b[i];
}
vector<ll> v[550],p[550];
for(i=n;i>=1;i--)
{
for(j=a[i];j<=b[i];j++)
{
ll tem=1;
for(k=i+1;k<=n;k++)
{
if(j>=b[k])
continue;
tem+=p[k][max(0LL,j-a[k]+1)];
tem%=mo;
}
v[i].pb(tem);
p[i].pb(0);
has+=tem;
has%=mo;
}
p[i].pb(0);
for(j=b[i]-a[i];j>=0;j--)
p[i][j]=(p[i][j+1]+v[i][j])%mo;
}
cout<<has<<"\n";
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
376 KB |
Output is correct |
| 2 |
Correct |
4 ms |
496 KB |
Output is correct |
| 3 |
Correct |
4 ms |
684 KB |
Output is correct |
| 4 |
Correct |
4 ms |
684 KB |
Output is correct |
| 5 |
Correct |
4 ms |
684 KB |
Output is correct |
| 6 |
Correct |
5 ms |
796 KB |
Output is correct |
| 7 |
Correct |
5 ms |
796 KB |
Output is correct |
| 8 |
Correct |
5 ms |
804 KB |
Output is correct |
| 9 |
Correct |
5 ms |
816 KB |
Output is correct |
| 10 |
Correct |
5 ms |
828 KB |
Output is correct |
| 11 |
Correct |
5 ms |
900 KB |
Output is correct |
| 12 |
Correct |
6 ms |
912 KB |
Output is correct |
| 13 |
Correct |
5 ms |
924 KB |
Output is correct |
| 14 |
Correct |
5 ms |
936 KB |
Output is correct |
| 15 |
Correct |
5 ms |
948 KB |
Output is correct |
| 16 |
Correct |
4 ms |
1152 KB |
Output is correct |
| 17 |
Correct |
4 ms |
1152 KB |
Output is correct |
| 18 |
Correct |
4 ms |
1152 KB |
Output is correct |
| 19 |
Correct |
5 ms |
1152 KB |
Output is correct |
| 20 |
Correct |
4 ms |
1152 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
376 KB |
Output is correct |
| 2 |
Correct |
4 ms |
496 KB |
Output is correct |
| 3 |
Correct |
4 ms |
684 KB |
Output is correct |
| 4 |
Correct |
4 ms |
684 KB |
Output is correct |
| 5 |
Correct |
4 ms |
684 KB |
Output is correct |
| 6 |
Correct |
5 ms |
796 KB |
Output is correct |
| 7 |
Correct |
5 ms |
796 KB |
Output is correct |
| 8 |
Correct |
5 ms |
804 KB |
Output is correct |
| 9 |
Correct |
5 ms |
816 KB |
Output is correct |
| 10 |
Correct |
5 ms |
828 KB |
Output is correct |
| 11 |
Correct |
5 ms |
900 KB |
Output is correct |
| 12 |
Correct |
6 ms |
912 KB |
Output is correct |
| 13 |
Correct |
5 ms |
924 KB |
Output is correct |
| 14 |
Correct |
5 ms |
936 KB |
Output is correct |
| 15 |
Correct |
5 ms |
948 KB |
Output is correct |
| 16 |
Correct |
4 ms |
1152 KB |
Output is correct |
| 17 |
Correct |
4 ms |
1152 KB |
Output is correct |
| 18 |
Correct |
4 ms |
1152 KB |
Output is correct |
| 19 |
Correct |
5 ms |
1152 KB |
Output is correct |
| 20 |
Correct |
4 ms |
1152 KB |
Output is correct |
| 21 |
Execution timed out |
2061 ms |
13436 KB |
Time limit exceeded |
| 22 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Runtime error |
1091 ms |
524288 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
376 KB |
Output is correct |
| 2 |
Correct |
4 ms |
496 KB |
Output is correct |
| 3 |
Correct |
4 ms |
684 KB |
Output is correct |
| 4 |
Correct |
4 ms |
684 KB |
Output is correct |
| 5 |
Correct |
4 ms |
684 KB |
Output is correct |
| 6 |
Correct |
5 ms |
796 KB |
Output is correct |
| 7 |
Correct |
5 ms |
796 KB |
Output is correct |
| 8 |
Correct |
5 ms |
804 KB |
Output is correct |
| 9 |
Correct |
5 ms |
816 KB |
Output is correct |
| 10 |
Correct |
5 ms |
828 KB |
Output is correct |
| 11 |
Correct |
5 ms |
900 KB |
Output is correct |
| 12 |
Correct |
6 ms |
912 KB |
Output is correct |
| 13 |
Correct |
5 ms |
924 KB |
Output is correct |
| 14 |
Correct |
5 ms |
936 KB |
Output is correct |
| 15 |
Correct |
5 ms |
948 KB |
Output is correct |
| 16 |
Correct |
4 ms |
1152 KB |
Output is correct |
| 17 |
Correct |
4 ms |
1152 KB |
Output is correct |
| 18 |
Correct |
4 ms |
1152 KB |
Output is correct |
| 19 |
Correct |
5 ms |
1152 KB |
Output is correct |
| 20 |
Correct |
4 ms |
1152 KB |
Output is correct |
| 21 |
Execution timed out |
2061 ms |
13436 KB |
Time limit exceeded |
| 22 |
Halted |
0 ms |
0 KB |
- |
