This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
#define int long long
int32_t main() {
ios::sync_with_stdio(0); cin.tie(0);
int n, m; cin >> n >> m;
vector<vector<int>> a(n, vector<int>(m));
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
cin >> a[i][j];
}
}
int ans = -1e9;
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
for (int k = 0; k < n; k++) {
for (int l = 0; l < m; l++) {
int temp = max(a[i][j], a[k][l]) - min(a[i][j], a[k][l]);
if (i == k && j == i) temp--;
else if (i == k) temp -= abs(j - l) + 1;
else if (j == l) temp -= abs(i - k) + 1;
else temp -= abs(i - k) + abs(j - l) + 1;
ans = max(ans, temp);
}
}
}
}
cout << ans << '\n';
}
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