#include <stdio.h>voidsame(int a[], int b[], int c[]){
int i, j, k;
i = j = k =0;while(i <7&& j <7){if(a[i]== b[j]){
c[k++]= a[i];
i++;
j++;}elseif(a[i]< b[j]){
i++;}else{
j++;}}}
int main(){
int a[5][7]={{1,3,4,7,8,9,10},{2,3,5,6,7,8,11},{1,2,3,4,5,6,7},{1,3,4,6,7,9,10},{2,5,6,7,8,15,17}};
int b[4][7]={{0},{0},{0},{0}};same(a[0], a[1], b[0]);for(int i =2; i <5; i++){same(b[i -2], a[i], b[i -1]);}for(int i =0; b[3][i]; i++){printf("%d ", b[3][i]);}return0;}