#include<bits/stdc++.h> using namespace std; int main(){ int i,j,n,m,d,x,s; cin>>n>>m; int a[n][m]; for(i=0;i<n;i++){ for(j=0;j<m;j++) { cin>>a[i][j]; } } d=a[1][1]; x=a[1][1]; for(i=0;i<n;i++){ for(j=0;j<m;j++) { if(a[i][j]>d){ d=a[i][j]; } if(a[i][j]<x){ x=a[i][j]; } } } s=d-x; cout<<s; } /************************************************************** Problem: 1272 User: wuzhijing Language: C++ Result: Accepted Time:8 ms Memory:2072 kb ****************************************************************/