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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, a[MAX_N], p[MAX_N], ip[MAX_N];
  8.     int numQuery, l[MAX_N], r[MAX_N];
  9.     bool ans[MAX_N];
  10.     vector<int> ids[MAX_N];
  11.     map<int, int> mark[MAX_N];
  12.     map<int, bool> reach[MAX_N];
  13.  
  14.     int main() {
  15.         ios_base::sync_with_stdio(0);
  16.         cin.tie(0);
  17.         cout.tie(0);
  18.  
  19.         freopen("XMAS.inp", "r", stdin);
  20.         freopen("XMAS.out", "w", stdout);
  21.  
  22.         cin >> n >> k;
  23.         for (int i = 1; i <= n; i++) {
  24.             cin >> a[i];
  25.         }
  26.         cin >> numQuery;
  27.         for (int i = 1; i <= numQuery; i++) {
  28.             cin >> l[i] >> r[i];
  29.             ids[r[i]].push_back(i);
  30.         }
  31.  
  32.         a[0] = -1;
  33.         reach[0][0] = true;
  34.         for (int i = 1; i <= n; i++) {
  35.             p[i] = mark[i - 1][k - a[i]];
  36.             ip[p[i]] = i;
  37.             if (p[i]) {
  38.                 swap(mark[i], mark[p[i] - 1]);
  39.                 swap(reach[i], reach[p[i] - 1]);
  40.             }
  41.             mark[i][a[i]] = i;
  42.             reach[i][i] = true;
  43.             for (int id : ids[i]) {
  44.                 ans[id] = reach[r[id]][l[id] - 1];
  45.             }
  46.         }
  47.  
  48.         for (int i = 1; i <= numQuery; i++) {
  49.             cout << (ans[i] ? "YES\n" : "NO\n");
  50.         }
  51.  
  52.         return 0;
  53.     }
Success #stdin #stdout 0.02s 64908KB
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https://ideone.com/WVo9j4
language:
C++14 (gcc 8.3)
created:
5 days ago
visibility:
public

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