# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
548330 | krit3379 | Calvinball championship (CEOI15_teams) | C++17 | 10 ms | 8120 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
#define N 1005
long long a[N],p[N][N],ma,ans=1,mod=1e6+7;
int main(){
int n,i,j,k;
scanf("%d",&n);
for(i=1;i<=n;i++)scanf("%lld",&a[i]);
for(i=1;i<=n;i++)p[0][i]=1;
for(i=1;i<=n;i++)for(j=1;j<=n;j++)p[i][j]=(j*p[i-1][j]+p[i-1][j+1])%mod;
for(i=1;i<=n;i++){
ans=(ans+(a[i]-1)*p[n-i][ma])%mod;
ma=max(ma,a[i]);
}
printf("%lld",ans);
return 0;
}
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