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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define int long long
  5. void solve(){
  6. 	int n;
  7. 	cin>>n;
  8. 	vector<int> v(n);
  9. 	for(int i=0;i<n;i++)cin>>v[i];
  10. 	map<int,int> mp;
  11. 	int sum=0;
  12. 	for(int i=0;i<n;i++){
  13. 		sum+=v[i];
  14. 		mp[sum]=i;
  15. 	}
  16. 	sum=0;
  17. 	int j=n-1;
  18. 	int i=-1;
  19. 	int ans=0;
  20. 	while(j>i){
  21. 		sum+=v[j];
  22. 		if(mp.find(sum)!=mp.end() && j>mp[sum]){
  23. 			i=mp[sum];
  24. 			ans=max(ans,i+1+n-j);
  25. 		}
  26. 		j--;
  27. 	}
  28. 	cout<<ans<<endl;
  29.  
  30. }
  31. signed main() {
  32. 	// your code goes here
  33. 	int t;
  34. 	cin>>t;
  35. 	while(t--){
  36. 		solve();
  37. 	}
  38. 	return 0;
  39. }
Success #stdin #stdout 0.01s 5292KB
comments (?)
stdin
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4
3
10 20 10
6
2 1 4 2 4 1
5
1 2 4 8 16
9
7 3 20 5 15 1 11 8 10
stdout
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2
6
0
7
https://ideone.com/bIN0Ar
language:
C++ (gcc 8.3)
created:
9 days ago
visibility:
public

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