UVA 10763 Foreign Exchange

CODE：

#include <iostream>
#include <cstdlib>
#include <cstring>
#include <cstdio>
#include <algorithm>
using namespace std;

#define MAXN 500001

int main()
{
int n;
while(scanf("%d", &n) && n)
{
for(int i = 0; i < n; i++)
{
scanf("%d%d", &a[i], &b[i]);
}
sort(a, a+n), sort(b, b+n);
if(memcmp(a, b, sizeof(b)) == 0) printf("YES\n");
else printf("NO\n");
}
return 0;
}