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;
int f(int a, int b) {
if(a == 0)return 1;
return b*f(a-1, b)+f(a-1, b+1);
}
int main () {
int n, ans = 0;
cin >> n;
int MAX = 0, a[n];
for(int i = 0;i<n;i++) {
cin >> a[i];
}
MAX = a[0];
int i = 0;
if(n > 1)
ans = (f(n-i-1, MAX)*(a[i+1]-1));
else ans = 1;
cout<<ans<<endl;
}
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