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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4. int t, n, pre, ans, mod = 1000000007, tmp;
  5.  
  6. int main() {
  7. 	scanf("%d", &t);
  8. 	while (t--) {
  9. 		scanf("%d", &n);
  10. 		scanf("%d", &tmp);
  11. 		for (int i = 1; i < n; ++i) {
  12. 			pre = tmp;
  13. 			scanf("%d", &tmp);
  14. 			tmp = (ll(pre + 1) * tmp + pre) % mod;
  15. 		}
  16. 		cout << tmp << endl;
  17. 	}
  18. 	return 0;
  19. }
Success #stdin #stdout 0s 16064KB
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https://ideone.com/rYmHOD
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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