样例输出是8，为啥呀？我要疯了，求助dalao，Thanks♪(･ω･)ﾉ

#include<bits/stdc++.h>
using namespace std;
int vis[100010],ans[100010];
queue<int> q;
int main(){
	int t,x,y;
	cin>>t;
	for(int i=1;i<=t;i++){
		cin>>x>>y;
		int x1;
		q.push(x);
		vis[x]=1;
		while(!q.empty()){
			x1=q.front();
			q.pop();
			//cout<<x1<<":"<<ans[x1]<<endl;
			if(x1==y){
				cout<<ans[y]<<endl;
				break;
			}
			if(x1+1<=100000 && vis[x1+1]==0){
				q.push(x1+1);
				ans[x1+1]=ans[x1]+1;
				vis[x1+1]==1;
			}
			if(x1-1>0 && vis[x1-1]==0){
				q.push(x1-1);
				ans[x1-1]=ans[x1]+1;
				vis[x1-1]==1;
			}
			if(2*x1<=100000 && vis[2*x1]==0){
				q.push(x1*2);
				ans[2*x1]=ans[x1]+1;
				vis[x1*2]==1;
			}
		}
	}
	return 0;
}