WA代码：

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