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  1. #include <bits/stdc++.h>
  2. #define ll long long
  3. #define val 1000000000000
  4. using namespace std;
  5.  
  6. ll a[1000002];
  7.  
  8. ll minm(ll x, ll y)
  9. {
  10.     if(x < y) return x;
  11.     return y;
  12. }
  13.  
  14. int main()
  15. {
  16.    // freopen("input_output\\in09.txt", "r", stdin);
  17.     //freopen("input_output\\out09.txt", "w", stdout);
  18.     int t;
  19.     cin >> t;
  20.     //assert(1 <= t && t <= 100);
  21.     while (t--) {
  22.         int n, z;
  23.         cin >> n >> z;
  24.         //assert(1 <= n && n <= 10000);
  25.         //assert(1 <= z && z <= n);
  26.         for (int i = 1; i <= n; i++) {
  27.             cin >> a[i];
  28.            // assert(0 <= a[i] && a[i] <= val);
  29.         }
  30.         ll prev = 0;
  31.         int prevptr = 1;
  32.         int currptr = z + 1;
  33.         for (int i = 1; i <= z; i++) prev ^= a[i];
  34.         ll ans_val = prev;
  35.         int ans = prevptr;
  36.         //cout << prev << " ";
  37.         while ((currptr - prevptr == z) && (currptr <= n) ) {
  38.             prev ^= a[prevptr];
  39.             prev ^= a[currptr];
  40.             ans_val = minm(prev, ans_val);
  41.             if(ans_val == prev) {
  42.                 ans = prevptr + 1;
  43.             }
  44.            // cout << prev << " ";
  45.             prevptr++;
  46.             currptr++;
  47.         }
  48.         //cout << endl;
  49.         cout << ans << endl;
  50.     }
  51. }
Runtime error #stdin #stdout 3.29s 10952KB
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/OvnRWa
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
secret

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