#include <stdio.h>
#include <stdlib.h>
 
int comp(const void *a, const void *b){
	return *(int *)a - *(int *)b;
}
 
int main(void){
    int A[5][2] = {{3, 4}, {1, 2}, {5, 6}, {9, 10}, {7, 8}};
    int B[5][2] = {{3, 4}, {1, 2}, {5, 6}, {9, 10}, {7, 8}};
    int *p = &A[0][0];
    int *q = &B[0][1];
    qsort(p, 5, sizeof(int) * 2, comp);
    qsort(q, 5, sizeof(int) * 2, comp);
    int i;
    for(i = 0 ; i < 5; i++){
    	printf("(%d, %d) ", A[i][0], A[i][1]);
	}
	printf("\n");
	for(i = 0 ; i < 5; i++){
    	printf("(%d, %d) ", B[i][0], B[i][1]);
	}
	printf("\n");
	system("pause");
	return 0;
}

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