一只题解

#include<iostream>
using namespace std;
int main(){
    string a,b;
    cin>>a>>b;
    int ax=a.length()-1;
    int bx=b.length()-1;
    int z=0;
    for(int i=0;i<=bx;i++){
        if(b[i]==a[z]){
 
            if(z==ax){
                cout<<a<<" is substring of "<<b;
                return 0;
            }
            else z++;
        }
        else z=0;
    }
    z=0;
    for(int i=0;i<=ax;i++){
        if(a[i]==b[z]){
 
            if(z==bx){
                cout<<b<<" is substring of "<<a;
                return 0;
            }
            else z++;
        }
        else z=0;
    }
    cout<<"No substring";
}