Untitled

#include<iostream>

#include<fstream>

using namespace std;

int main()

{ ifstream f( "matrice.txt" );
    
    int v[21][31], n, m, i, j, min, max, lmax, lmin;
    
    cin >> n >> m;
    
    for ( i = 1; i <= m; i ++) 
    
        for ( j = 1; j <= n; j ++) { 
             
            f >> v[i][j];
            
            if( i == 0 && j == 0) min = max = v[i][j];
                    
            else {  if ( v[i][j] < min ) { min= v[i][j];
            
                                           lmin = i; }
                
                   if ( v[i][j] > max ) { max = v[i][j];
                   
                                  lmax = i; }
                 
                }
        }
    
      
    for ( i = 1; i <= n; i ++) 
          
          swap ( v[lmax][j] , v[lmin][j] );
     
    for ( i = 1; i <= m; i ++) {
      
      for ( j = 1; j <= n; j ++)
       
         cout << v[i][j] << " ";
         
    cout << endl;
    } 
    
    f.close();
  
return 0;
  }