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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. typedef long long ll;
  5.  
  6. ll rs(vector<ll>& sum, int l, int r) {
  7. 	return sum[r]-(l?sum[l-1]:0);
  8. }
  9.  
  10. int main() {
  11. 	int n;
  12. 	cin>>n;
  13. 	vector<ll> a(n);
  14. 	for(int i=0;i<n;++i) {
  15. 		cin>>a[i];
  16. 	}
  17.  
  18. 	vector<ll> sum(n,0);
  19. 	sum[0]=a[0];
  20. 	for(int i=1;i<n;++i) {
  21. 		sum[i]=sum[i-1]+a[i];
  22. 	}
  23.  
  24. 	vector<ll> R(n,0), L(n,0);
  25. 	R[n-1]=a[n-1];
  26. 	for(int i=n-2;i>=0;i--) {
  27. 		R[i]=min(R[i+1]+a[i],  a[i]);
  28.  
  29. 	}
  30.  
  31. 	L[0]=a[0];
  32. 	for(int i=1;i<n;++i) {
  33. 		L[i]=min(L[i-1], sum[i]);
  34. 	}
  35.  
  36. 	int ans=0;
  37. 	for(int i=0;i<n;++i) {
  38.  
  39. 		if(R[i]>=0 && rs(sum,i,n-1)+L[i-1]>=0) {
  40. 			ans++;
  41. 		}
  42. 	}
  43.  
  44. 	cout<<ans<<"\n";
  45.  
  46. 	return 0;
  47. }
  48.  
Runtime error #stdin #stdout 0s 15240KB
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https://ideone.com/mM0RTf
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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