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 <cstdio>
#include <vector>
#include <algorithm>
#include <utility>
#include <queue>
#include <string>
#include <cstring>
using namespace std;
#define in cin
#define out cout
#define all(v) v.begin(), v.end()
#define X first
#define Y second
int CNT[1010];
int main()
{
    int n, m; in >> n >> m;
    vector< pair<int, int> > v;
    for(int i=0; i<n; i++)
    {
        for(int j=0; j<m; j++)
        {
            int x; in >> x;
            v.push_back(make_pair(x, i));
        }
    }
    sort(all(v));
    int q = 0;
    int K = 0;
    int res = 101010101;
    for(int p=0; p<n*m; p++)
    {
        if(CNT[ v[p].Y ] == 0) K++;
        CNT[ v[p].Y ]++;
        while(K == n)
        {
            if(v[p].X - v[q].X < res) res = v[p].X - v[q].X;
            CNT[ v[q].Y ]--;
            if(CNT[ v[q].Y ] == 0) K--;
            q++;
        }
    }
    int p = n*m-1;
        while(K == n)
        {
            if(v[p].X - v[q].X < res) res = v[p].X - v[q].X;
            CNT[ v[q].Y ]--;
            if(CNT[ v[q].Y ] == 0) K--;
            q++;
        }
    out << res;
    return 0;
}
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