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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int n, k;
  4. int a[300005];
  5. char s[300005], b[300005];
  6.  
  7. bool check(int val) {
  8.     int dem = 0;
  9.     char last = 'R';
  10.     for (int i = 1; i <= n; i++) {
  11.         if (a[i] > val) {
  12.             if (s[i] == 'B' && last != 'B') {
  13.                 dem++;
  14.             }
  15.             last = s[i];
  16.         }
  17.     }
  18.     return (dem <= k);
  19. }
  20.  
  21. main() {
  22.     ios_base::sync_with_stdio(false);
  23.     cin.tie(0); cout.tie(0);
  24.     int test;
  25.     cin >> test;
  26.  
  27.     while (test--) {
  28.         cin >> n >> k;
  29.         for (int i = 1; i <= n; i++) cin >> s[i];
  30.         for (int i = 1; i <= n; i++) cin >> a[i];
  31.  
  32.         int l = -1;
  33.         int r = 1e9 + 1;
  34.         while (l < r - 1) {
  35.             int mid = (l + r) / 2;
  36.             if (check(mid)) r = mid;
  37.             else l = mid;
  38.         }
  39.  
  40.         cout << r << '\n';
  41.  
  42.     }
  43.  
  44.     return 0;
  45. }
  46.  
Success #stdin #stdout 0.01s 5324KB
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https://ideone.com/WgGAij
language:
C++14 (gcc 8.3)
created:
15 hours ago
visibility:
public

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