Untitled

#include<iostream>

#include<fstream>

using namespace std;

int main()

{ ifstream f( "matrice.txt" );
    
    int v[21][31], n, m, i, j, min, max, l1, l2;
    
    cin >> n >> m;
    
    for ( i = 1; i <= n; i ++) 
    
        for ( j = 1; j <= m; j ++) f >> v[i][j];
        
    max = v[1][1];
    
    min = v[1][2];
        
    for ( i = 2; i <= n; i ++) {
        
        for ( j = 3; j <= m; j ++) {
            
            if ( v[i][j] > max ) { max = v[i][j];
            
                                   l1 = i; }
            
            else if ( v[i][j] < min ) { min = v[i][j];
            
                                        l2 = i; }
        }
    }
    
    for ( i = 1; i <= n; i ++) {
      
      for ( j = 1; j <= m; j ++) 
          
          swap ( v[l1][j] , v[l2][j] );
     }
      
    for ( i = 1; i <= n; i ++) {
      
      for ( j = 1; j <= m; j ++)
       
         cout << v[i][j] << " ";
         
    cout << endl;
    } 
    
    f.close();
  
return 0;
  }