HDU 1029

#include<stdio.h>int main(){    int n,count,k,ans;    while(scanf("%d",&n)!=EOF)    {        count=0;        while(n--)        {            scanf("%d",&k);            if(!count)            {                ans=k;                count++;            }            else if(ans==k)                count++;            else                count--;        }        printf("%d\n",ans);    }}