Submission #2766833

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Source Code Expand

#include <bits/stdc++.h>

#if MYDEBUG
#include "lib/cp_debug.hpp"
#else
#define DBG(...) ;
#endif

using LL = long long;
constexpr LL LINF = 334ll << 53;
constexpr int INF = 15 << 26;
constexpr LL MOD = 1E9 + 7;

namespace Problem {
using namespace std;

class Solver {
 public:
  int n;
  vector<LL> a, b;

  Solver(LL n) : n(n), a(n){};

  void solve() {
    for (int i = 0; i < n; ++i) {
      cin >> a[i];
    }
    b = a;
    for (int i = 0; i < n; ++i) {
      b[i] -= i + 1;
    }
    sort(b.begin(), b.end());
    LL m = b[n / 2];
    DBG(m)
    LL ans = 0;
    for (int i = 0; i < n; ++i) {
      ans += abs(a[i] - m - i - 1);
    }
    cout << ans << endl;
  }
};
}  // namespace Problem

int main() {
  std::cin.tie(0);
  std::ios_base::sync_with_stdio(false);
  long long n = 0;
  std::cin >> n;

  Problem::Solver sol(n);
  sol.solve();
  return 0;
}

Submission Info

Judge Result