68 lines
1.0 KiB
C++
68 lines
1.0 KiB
C++
#include <bits/stdc++.h>
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using namespace std;
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void test_case(int tc){
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int n, k;
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cin >> n >> k;
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vector<bool> strip;
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int blacks = 0;
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int whites = 0;
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for(int i = 0; i < k; ++i){
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char c;
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cin >> c;
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if(c == 'B'){
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blacks++;
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strip.push_back(true);
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} else{
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whites++;
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strip.push_back(false);
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}
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}
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int min_whites = whites;
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for(int i = 0; i < n - k; ++i){
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char c;
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cin >> c;
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if(strip[i]){
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blacks--;
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} else {
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whites--;
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}
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if(c == 'B'){
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blacks++;
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strip.push_back(true);
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} else {
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whites++;
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strip.push_back(false);
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}
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min_whites = min(min_whites, whites);
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}
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cout << min_whites << '\n';
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}
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int main(){
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ios::sync_with_stdio(0);
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cin.tie(0);
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int t;
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cin >> t;
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for(int tc = 1; tc <= t; ++tc){
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test_case(tc);
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}
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cout << flush;
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return 0;
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} |