| # | Time | Username | Problem | Language | Result | Execution time | Memory | 
|---|---|---|---|---|---|---|---|
| 40414 | Pajaraja | Calvinball championship (CEOI15_teams) | C++14 | 367 ms | 1436 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;
const int MOD=1000007;
long long dp[10007],dpl[10007];
long long a[10007],parc[10007];
int main()
{
	long long cur=0;
	int n;
	scanf("%d",&n);
	for(int i=1;i<=n;i++) scanf("%d",&a[i]);
	parc[0]=0;
	for(int i=1;i<=n;i++) parc[i]=fmax(parc[i-1],a[i]);
	for(int i=1;i<=n;i++) dp[i]=1;
	for(int j=n;j>=1;j--)
	{
		cur=(cur+dp[parc[j-1]]*(min(parc[j-1],a[j]-1)))%MOD;
		for(int i=parc[j-1]+1;i<a[j];i++) cur=(cur+dp[i])%MOD;
		for(int i=1;i<=n;i++) dpl[i]=dp[i];
		for(int i=1;i<=n;i++) dp[i]=(i*dpl[i]+dpl[i+1])%MOD;
	}
	printf("%d",cur+1);
}
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