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