func_code_string: #include <bits/stdc++.h>   #pragma GCC optimize( Ofast )   #pragma GCC target( sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native )   using namespace std;   long long MOD = 1e9 + 7;   long long dp[4000][4000];   long long mn[4000][4000];   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     long long n;     cin >> n;     set<long long> uss;     long long a[n];     long long b[n];     long long sm = 0;     for (int i = 0; i < n; i++) {       cin >> a[i];       a[i] = a[i] - i;       uss.insert(a[i]);     }     vector<long long> us;     for (auto i : uss) {       us.push_back(i);     }     for (int i = 0; i < n; i++) {       for (int j = 0; j < us.size(); j++) {         dp[i + 1][j] = mn[i][j] + abs(us[j] - a[i]);         mn[i + 1][j] = dp[i + 1][j];         if (j) mn[i + 1][j] = min(mn[i + 1][j], mn[i + 1][j - 1]);       }     }     cout << mn[n][us.size() - 1];   }   