C语言潇洒三元运算，注意题目意思是无限完全二叉树，用不断除2直到相等即可
二叉树
http://www.nowcoder.com/questionTerminal/5b80ab166efa4551844657603227caeb
#include<stdio.h>
int main()
{
int x,y;
while(scanf("%d %d",&x,&y)!=EOF)
{
while(x!=y){
x>y?(x/=2):(y/=2);
}
printf("%d\n",y);
}
}
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