# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
548337 | krit3379 | Calvinball championship (CEOI15_teams) | C++17 | 7 ms | 340 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[2][N],ma[N],ans=1,mod=1e6+7;
int main(){
int n,i,j,k,now=0,prev;
scanf("%d",&n);
for(i=1;i<=n;i++)scanf("%lld",&a[i]);
for(i=1;i<=n;i++)p[now][i]=1,ma[i]=max(a[i],ma[i-1]);
for(i=1;i<=n;i++){
prev=now;
now=1-now;
for(j=1;j<=n;j++){
p[now][j]=(j*p[prev][j]+p[prev][j+1])%mod;
}
ans+=(a[n-i+1]-1)*p[prev][ma[n-i]];
ans%=mod;
}
printf("%lld",ans);
return 0;
}
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