/in/foo.cc: In function 'void dps()':
/in/foo.cc:8:34: error: 'memset' was not declared in this scope
     memset(f,0x7fffffff,sizeof(f)); 
                                  ^
/in/foo.cc:13:50: error: 'abs' was not declared in this scope
             w[i]+=abs(a[rec[j]][i]-a[rec[j+1]][i]);
                                                  ^
/in/foo.cc:22:55: error: 'abs' was not declared in this scope
                 v[i][j]+=abs(a[rec[k]][i]-a[rec[k]][j]);
                                                       ^
/in/foo.cc:33:59: error: 'min' was not declared in this scope
                 f[i][j]=min(f[i-1][k]+w[j]+v[k][j],f[i][j]);
                                                           ^
/in/foo.cc:39:28: error: 'min' was not declared in this scope
         ans=min(ans,f[c][i]);
                            ^
/in/foo.cc: In function 'void dfs(int, int)':
/in/foo.cc:46:38: error: 'memset' was not declared in this scope
         memset(f,0x7fffffff,sizeof(f)); 
                                      ^
/in/foo.cc:51:50: error: 'abs' was not declared in this scope
             w[i]+=abs(a[rec[j]][i]-a[rec[j+1]][i]);
                                                  ^
/in/foo.cc:60:55: error: 'abs' was not declared in this scope
                 v[i][j]+=abs(a[rec[k]][i]-a[rec[k]][j]);
                                                       ^
/in/foo.cc:71:59: error: 'min' was not declared in this scope
                 f[i][j]=min(f[i-1][k]+w[j]+v[k][j],f[i][j]);
                                                           ^
/in/foo.cc:77:28: error: 'min' was not declared in this scope
         ans=min(ans,f[c][i]);
                            ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:89:5: error: 'cin' was not declared in this scope
     cin>>n>>m>>r>>c;
     ^~~
/in/foo.cc:94:32: error: 'scanf' was not declared in this scope
             scanf("%d",&a[i][j]);
                                ^
/in/foo.cc:98:5: error: 'cout' was not declared in this scope
     cout<<ans;    
     ^~~~