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30 lines
686 B
C++
30 lines
686 B
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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typedef long long ll;
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const int N = 1e5 + 50;
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ll a[N];
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int C[N];
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int main()
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{
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int T, n;
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scanf("%d", &T);
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while (T--)
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{
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memset(C, 0, sizeof C);
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scanf("%d", &n);
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for (int i = 1; i <= n; i++) scanf("%lld", a + i);
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ll ans = 0;
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for (int i = 1; i <= n; i++)
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{
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int cnt = 0;
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for (int x = a[i]; !C[x]; x = a[x])
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C[x] = true, cnt++;
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if (cnt) ans += cnt - 1;
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}
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printf("%lld\n", ans);
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}
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return 0;
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}
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