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  1. #include <bits/stdc++.h>
  2.  
  3.     using namespace std;
  4.  
  5.     const int MAX_N = 500005;
  6.  
  7.     int n, k, numQuery;
  8.     int a[MAX_N];
  9.  
  10.     int main() {
  11.         ios_base::sync_with_stdio(0);
  12.         cin.tie(0);
  13.         cout.tie(0);
  14.  
  15.         freopen("XMAS.inp", "r", stdin);
  16.         freopen("XMAS.out", "w", stdout);
  17.  
  18.         cin >> n >> k;
  19.         for (int i = 1; i <= n; i++) {
  20.             cin >> a[i];
  21.         }
  22.         cin >> numQuery;
  23.  
  24.         while (numQuery--) {
  25.             int left, right;
  26.             cin >> left >> right;
  27.             stack<int> st;
  28.  
  29.             for (int i = left; i <= right; i++) {
  30.                 if (st.empty()) {
  31.                     st.push(a[i]);
  32.                 } else if (st.top() + a[i] != k) {
  33.                     st.push(a[i]);
  34.                 } else {
  35.                     st.pop();
  36.                 }
  37.             }
  38.  
  39.             cout << (st.empty() ? "YES\n" : "NO\n");
  40.         }
  41.  
  42.         return 0;
  43.     }
Success #stdin #stdout 0s 5288KB
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https://ideone.com/jgkxmZ
language:
C++14 (gcc 8.3)
created:
5 days ago
visibility:
public

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