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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void solve() {
  5. 	int n;
  6. 	cin >> n;
  7. 	vector<int> a(n);
  8. 	for (int i = 0; i < n; i++) cin >> a[i];
  9. 	for (int i = 0; i < n - 1; i++) {
  10. 		if (a[i] <= a[i + 1]) {
  11. 			a[i + 1] -= a[i];
  12. 		} else {
  13. 			cout << "NO" << endl;
  14. 			return;
  15. 		}
  16. 	}
  17. 	cout << "YES" << endl;
  18. }
  19.  
  20. int main() {
  21. 	int t;
  22. 	cin >> t;
  23. 	while (t--) solve();
  24. }
Success #stdin #stdout 0s 5288KB
comments (?)
stdin
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5
5
1 2 3 4 5
4
4 3 2 1
4
4 5 2 3
8
4 5 4 5 4 5 4 5
9
9 9 8 2 4 4 3 5 3
stdout
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YES
NO
YES
YES
NO
https://ideone.com/k046XJ
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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