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42 lines
1.1 KiB
C++
42 lines
1.1 KiB
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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#define CRP(t, x) const t &x
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#define OPL(t, x) bool operator<(CRP(t, x)) const
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#define FIL(x, v) memset(x, v, sizeof(x))
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#define CLR(x) FIL(x, 0)
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#define NE1(x) FIL(x, -1)
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#define INF(x) FIL(x, 0x3f)
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#ifndef _DEBUG
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#define _DEBUG 0
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#endif // !_DEBUG
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#define IFD if (_DEBUG)
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typedef long long ll, i64;
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const int N = 2e5 + 50;
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char s[N];
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int cnt[N][27];
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char tgt[N];
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int main()
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{
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int T, n, k;
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scanf("%d", &T);
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while (T--)
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{
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scanf("%d%d%s", &n, &k, s);
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memset(cnt, 0, sizeof(int) * k * 27);
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for (int i = 0; i < n; i += k)
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for (int j = 0; j < k; j++)
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{
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cnt[j][s[i + j] - 'a']++;
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cnt[j][s[i + k - j - 1] - 'a']++;
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}
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for (int i = 0; i < k; i++) tgt[i] = 'a' + max_element(cnt[i], cnt[i] + 27) - cnt[i];
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int ans = 0;
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for (int i = 0; i < n; i += k)
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for (int j = 0; j < k; j++)
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if (s[i + j] != tgt[j]) ans++;
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printf("%d\n", ans);
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}
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return 0;
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} |