Josif_tepe

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Mar 14th, 2026
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C++ 1.10 KB | None | 0 0
  1. #include <iostream>
  2. using namespace std;
  3. const int maxn = 1e6 + 5;
  4. const int INF = 2e9;
  5. int segment_tree[3 * maxn];
  6. int a[maxn];
  7.  
  8. void build_tree(int L, int R, int node) {
  9.     if(L == R) {
  10.         segment_tree[node] = a[L];
  11.     }
  12.     else {
  13.         int middle = (L + R) / 2;
  14.         build_tree(L, middle, 2 * node);
  15.         build_tree(middle + 1, R, 2 * node + 1);
  16.         segment_tree[node] = max(segment_tree[2 * node], segment_tree[2 * node + 1]);
  17.     }
  18. }
  19.  
  20. //L R i L R j L R
  21. int query(int i, int j, int L, int R, int node) {
  22.     if(R < i or j < L) {
  23.         return -INF;
  24.     }
  25.     if(i <= L and R <= j) {
  26.         return segment_tree[node];
  27.     }
  28.     int middle = (L + R) / 2;
  29.     return max(query(i, j, L, middle, 2 * node), query(i, j, middle + 1, R, 2 * node + 1));
  30. }
  31. int main(){
  32.     ios_base::sync_with_stdio(false);
  33.     int n, k;
  34.     cin >> n >> k;
  35.    
  36.     for(int i = 0; i < n; i++) {
  37.         cin >> a[i];
  38.     }
  39.    
  40.     build_tree(0, n - 1, 1);
  41.    
  42.     for(int i = 0; i < n - k + 1; i++) {
  43.         cout << query(i, i + k - 1, 0, n - 1, 1) << " ";
  44.     }
  45.  
  46.     return 0;
  47. }
  48.  
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