Language: C++

/**
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*/
#include <cstring>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <queue>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cassert>

#define F first
#define S second
#define endl '\n'
#define deb(x) cout<<#x<<' '<<x<<endl;
#define pb push_back

#ifdef IZI_KATKA
#define int __int64_t
#else
#define int __int64
#endif

const long long MOD = 1e9 + 7;
const long long MAXN = 1e6 + 1;
using namespace std;

typedef long long ll;

long long readInt() {
    bool minus1 = false;
    long long result = 0;
    char ch;
    ch = getchar();
    while (true) {
        if (ch == '-') break;
        if (ch >= '0' && ch <= '9') break;
        ch = getchar();
    }
    if (ch == '-') minus1 = true; else result = ch-'0';
    while (true) {
        ch = getchar();
        if (ch < '0' || ch > '9') break;
        result = result*10 + (ch - '0');
    }
    if (minus1)
        return -result;
    else
        return result;
}

int n;
int a[MAXN];

int f(int x) {
	int sum = 0;
	for (int i = 1; i <= n; i++) {
		sum += abs(i[a] - x);	
	}             
	return sum;
}
int b[MAXN];

 main() {
	#ifdef IZI_KATKA
	assert(freopen("input", "r", stdin));
    assert(freopen("output", "w", stdout));
    #endif
     n = readInt();
    for (int i = 1; i <= n; i++) {
    	a[i] = (b[i] = readInt()) - i;
    }
    sort(a + 1, a + 1 + n);
	cout << f(a[(n+1)/2]);
    return 0;
}

Compiler output:
a.cc:35:13: error: '__int64' does not name a type; did you mean '__int64_t'?
   35 | #define int __int64
      |             ^~~~~~~
a.cc:66:1: note: in expansion of macro 'int'
   66 | int n;
      | ^~~
a.cc:35:13: error: '__int64' does not name a type; did you mean '__int64_t'?
   35 | #define int __int64
      |             ^~~~~~~
a.cc:67:1: note: in expansion of macro 'int'
   67 | int a[MAXN];
      | ^~~
a.cc:35:13: error: '__int64' does not name a type; did you mean '__int64_t'?
   35 | #define int __int64
      |             ^~~~~~~
a.cc:69:1: note: in expansion of macro 'int'
   69 | int f(int x) {
      | ^~~
a.cc:35:13: error: '__int64' does not name a type; did you mean '__int64_t'?
   35 | #define int __int64
      |             ^~~~~~~
a.cc:76:1: note: in expansion of macro 'int'
   76 | int b[MAXN];
      | ^~~
a.cc:78:2: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   78 |  main() {
      |  ^~~~
a.cc: In function 'int main()':
a.cc:83:6: error: 'n' was not declared in this scope; did you mean 'yn'?
   83 |      n = readInt();
      |      ^
      |      yn
a.cc:35:13: error: '__int64' was not declared in this scope; did you mean '__ynf64'?
   35 | #define int __int64
      |             ^~~~~~~
a.cc:84:10: note: in expansion of macro 'int'
   84 |     for (int i = 1; i <= n; i++) {
      |          ^~~
a.cc:84:21: error: 'i' was not declared in this scope
   84 |     for (int i = 1; i <= n; i++) {
      |                     ^
a.cc:85:9: error: 'a' was not declared in this scope
   85 |         a[i] = (b[i] = readInt()) - i;
      |         ^
a.cc:85:17: error: 'b' was not declared in this scope; did you mean 'pb'?
   85 |         a[i] = (b[i] = readInt()) - i;
      |                 ^
      |                 pb
a.cc:87:10: error: 'a' was not declared in this scope
   87 |     sort(a + 1, a + 1 + n);
      |          ^
a.cc:88:17: error: 'f' was not declared in this scope
   88 |         cout << f(a[(n+1)/2]);
      |                 ^