/* Ektupwnei tis sthles me ta idia stoixeia enos pinaka 2 diastasewn */
 
#include<stdio.h>
#define ROWS 4
#define COLS 5
int main(void){
int i,j,k;
int arr2d[ROWS][COLS]={ {2,6,1,4,0} , {8,0,5,3,3} , {4,2,20,5,16} , {1,3,4,12,16} };
int found_same[COLS]={0};
 
for(i=0; i<COLS; ++i) {
		found_same[i] = 0;
		for (j=0; j<ROWS-1; j++) {
			for(k=j+1; k<ROWS; k++) {
				if (arr2d[j][i] == arr2d[k][i]) found_same[i] = 1;
			}
		}
	}
 
	for(i=0; i<ROWS; ++i) {
		for (j=0; j<COLS; j++) {
			if (found_same[j])
				printf("%3d",arr2d[i][j]);
		}
		printf("\n");
	}
	return 0;
}
 

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