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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4. #define int long long
  5. #define yes cout << "YES\n";
  6. #define no cout << "NO\n";
  7.  
  8.  
  9. void FastIO(){
  10.     ios_base::sync_with_stdio(false);
  11.     cin.tie(nullptr);
  12.     cout.tie(nullptr);
  13. }
  14. /// Eating Candies
  15. void solve(){
  16.     int n;
  17.     cin >> n;
  18.  
  19.     vector<int> vec(n);
  20.  
  21.     for(int i = 0; i < n; i++){
  22.         cin >> vec[i];
  23.     }
  24.  
  25.     int ans = 0, i = 1, j = n-1, a = vec[0], b = 0;
  26.  
  27.     while(i<=j){
  28.         if(a < b){
  29.             a += vec[i];
  30.             i++;
  31.         }
  32.  
  33.         else if(a > b){
  34.             b += vec[j];
  35.             j--;
  36.         }
  37.  
  38.         else{
  39.             ans = max(ans,i + n-j-1);
  40.             a += vec[i];
  41.             i++;
  42.         }
  43.     }
  44.     if(a == b){
  45.         ans = max(ans,i + n-j-1);
  46.     }
  47.     cout << ans << "\n";
  48. }
  49.  
  50. signed main(){
  51.     FastIO();
  52.  
  53.     int t;
  54.     cin >> t;
  55.  
  56.     while(t--){
  57.         solve();
  58.     }
  59.     return 0;
  60. }
Success #stdin #stdout 0.01s 5320KB
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stdin
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4
3
10 20 10
6
2 1 4 2 4 1
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1 2 4 8 16
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7 3 20 5 15 1 11 8 10
stdout
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2
6
0
7
https://ideone.com/cF1e6H
Eating Candies
language:
C++14 (gcc 8.3)
created:
5 hours ago
visibility:
public

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