36 lines
950 B
C++
36 lines
950 B
C++
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int main(){
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char num1[2010][100],num2[2010][100];
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int j,i,samep,count,n,butong,same;
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while(scanf("%d",&n) != EOF && n){
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getchar();
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for(i = 0;i < n * 2;i++)
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scanf("%s",&num2[i]);
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same = 0;
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for(i = 0;i < n * 2;i++){
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for(j = i+1;j < n * 2;j++){
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if(strcmp(num2[i],num2[j]) == 0){
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same++;
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break;
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}
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}
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}
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butong = n * 2 - same;
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same = 0;
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for(i = 1;i < n * 2;i+=2)
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for(j = i+2;j < n*2;j+=2){
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if(strcmp(num2[i],num2[j]) == 0){
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same++;
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break;
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}
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}
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count = n - same;
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if(butong - count == 1)
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printf("Yes\n");
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else
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printf("No\n");
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}
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}
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