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  1. #include <bits/stdc++.h>
  2. #define ll long long 
  3. using namespace std;
  4. string s;
  5. ll n, k;
  6. vector<ll>a(3e5+7);
  7. bool ok(ll x) {
  8.     int tr = 0;int i = 0;
  9.     while(i < n) {
  10.         if(s[i]=='R'&&a[i]>x) {
  11.             i++;  continue;}
  12.        int p=0;
  13.         while(i<n&&(s[i]=='R'&&a[i]>x)==0) {
  14.             if(s[i]=='B'&& a[i]>x) {
  15.                 p =1;
  16.             }
  17.             i++;
  18.         }
  19.         if(p)tr++;
  20.     }
  21.     return tr<= k;
  22. }
  23.  
  24. int main() {
  25.     ios::sync_with_stdio(false);
  26.     cin.tie(nullptr);
  27.     int t;
  28.     cin >> t;
  29.     while(t--) {
  30.         cin >> n >> k;
  31.         cin >> s;
  32.         int mx_a= 0;
  33.         for (int i = 0;i<n; i++) {
  34.             cin >> a[i];
  35.             if(a[i]>mx_a)
  36.                { mx_a = a[i];}
  37.         }
  38.         ll l =0,r= mx_a;
  39.         ll ans=mx_a;
  40.         while(l<=r) {
  41.             ll mid=l+(r-l)/2;
  42.             if(ok(mid)) {
  43.                 ans = mid;
  44.                 r = mid-1;
  45.             } 
  46.             else {
  47.                 l = mid+1;
  48.             }
  49.             // cout<<ans<<"\n";
  50.         }
  51.         cout << ans << "\n";
  52.     }
  53.     return 0;
  54. }
Success #stdin #stdout 0.01s 5460KB
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https://ideone.com/fwo4CT
language:
C++ (gcc 8.3)
created:
12 days ago
visibility:
public

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