50分，谁能助我渡过玄关，第一个样例不对，第二个对

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n; 
	cin>>n;
	for(int i=1;i<=n;i++){
		string a,b;
		cin>>a>>b;
		int la=a.length();
		int lb=b.length();
		if(la==lb){
			int s=0;
			for(int i=0;i<la;i++)if(a[i]!=b[i])s++;
			if(s<=1)cout<<"similar"<<endl;
			else cout<<"not similar"<<endl;
		}else if(la==lb+1){
			int s=0;
			for(int i=0,j=0;i<la;i++,j++){
				if(a[i]!=b[j]){
					s++;
					j--;
				}
			}
			if(s<=1)cout<<"similar"<<endl;
			else cout<<"not similar"<<endl;
		}else if(la==lb-1){
			int s=0;
			for(int i=0,j=0;i<la;i++,j++){
				if(a[j]!=b[i]){
					s++;
					j--;
				}
			}
			if(s<=1)cout<<"similar"<<endl;
			else cout<<"not similar"<<endl;
		}else cout<<"not similar"<<endl;
	}
	return 0;
}