#include <stdio.h>
#include <math.h>
#include <string.h>
typedef struct Num
{
int a;
int b;
}num;
int main(void){
int n;
scanf("%d", &n);
num arr[n];
for(int f=0; f<n; f++)
{
scanf("%d %d", &arr[f].a, &arr[f].b);
}
for(int i=0; i<n-1; i++) //바퀴 반복
{
for(int j=0; j<n-1-i; j++) //비교활동 반복
{
if(arr[j].a > arr[j+1].a)
{
int t; // 임시 저장
int m; // b 임시저장
t=arr[j].a;
m = arr[j].b;
arr[j].a = arr[j+1].a;
arr[j].b = arr[j+1].b;
arr[j+1].a = t;
arr[j+1].b = m;
}
}
}
for(int i=0; i<n; i++)
{
printf("%d %d\n",arr[i].a, arr[i].b);
}
}
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