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27 lines
753 B
C++
27 lines
753 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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#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 + 60;
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ll a[N];
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int main()
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{
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int n;
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scanf("%d", &n);
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for (int i = 0; i < n; i++) scanf("%lld", a + i), a[i] -= i;
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nth_element(a, a + n / 2, a + n);
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printf("%lld", accumulate(a, a + n, 0ll, [&](ll s, ll c) { return s + abs(c - a[n >> 1]); }));
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return 0;
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}
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