UVa 10763
统计国家代号出现的次数，如果去的和来的相等就输出YES即可。import java.util.*;
public class Main10763 {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
while(true) {
int n = scan.nextInt();
if(n == 0) break;
int[] a = new int, b = new int;
Arrays.fill(a, 0);
Arrays.fill(b, 0);
int maxg = 0;
for(int i=0; i<n; i++) {
int mm = scan.nextInt();
int nn = scan.nextInt();
maxg = max(maxg, max(mm, nn));
a ++;
b ++;
}
int cnt = 0;
for(int i=0; i<=maxg; i++) {
if(a != b) {
cnt = 1;
break;
}
}
if(cnt == 0)
System.out.println("YES");
else
System.out.println("NO");
}
}
public static int max(int a, int b) {
if(a >= b)
return a;
else
return b;
}
}
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