find函数超简单

#include<iostream>
#include<cstdio>
using namespace std;
int main(){
	string a,b;
	cin>>a>>b;
	if(a.find(b)!=-1){
		cout<<b<<" is substring of "<<a;
		return 0;
	}
	if(b.find(a)!=-1){
		cout<<a<<" is substring of "<<b;
		return 0;
	}
	cout<<"No substring"; 
    return 0;
}