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 "bits/stdc++.h"
using namespace std;
const int MAXN = 2e5 + 10;
const int MOD = 1e9 + 7;
#define int long long
mt19937_64 rng((int)std::chrono::steady_clock::now().time_since_epoch().count());
int rnd(int x, int y) {
int u = uniform_int_distribution<int>(x, y)(rng); return u;
}
void solve(int tc) {
int n, m;
cin >> n >> m;
int a[n+1][m+1];
for(int i=1; i<=n; i++) {
for(int j=1; j<=m; j++) {
cin >> a[i][j];
}
}
int ans = -1e9;
for(int i=1; i<=n; i++) {
for(int j=1; j<=m; j++) {
for(int k=1; k<=n; k++) {
for(int l=1; l<=m; l++) {
ans = max(ans, abs(a[i][j] - a[k][l]) - (abs(i - k) + abs(j - l) + 1));
}
}
}
}
cout << ans << "\n";
}
int32_t main(){
ios::sync_with_stdio(0); cin.tie(0);
int t = 1; //cin >> t;
for(int i=1; i<=t; i++) solve(i);
}
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