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 <iostream>
#include <cstring>
using namespace std;
int N;
int arr[10005];
int dp(int idx, int num, int marker){
if(idx >= N) return 0;
if(idx == N - 1) return 1;
if(num > N) return 0;
int summ = 0;
for(int i = 1; i <= num + 1; i++){
if(marker){
if(i == arr[idx + 1])summ += dp(idx + 1, i, 1);
else if (i < arr[idx + 1])summ += dp(idx + 1, i, 0);
else break;
}
else if(i == num + 1) summ += dp(idx + 1, num + 1, 0);
else summ += dp(idx + 1, num, 0);
summ %= 1000007;
}
return summ;
}
int main(){
cin >> N;
for(int i = 0; i < N; i++) cin >> arr[i];
cout << dp(0, 1, 1);
}
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