错 #3和#5

#include <bits/stdc++.h>
using namespace std;
int main(){
	char s1[210],s2[210];
	cin>>s1>>s2;
	if(strlen(s1)>strlen(s2)){
		cout<<s2<<" is substring of "<<s1;
	}
	else if(strlen(s1)<strlen(s2))cout<<s1<<" is substring of "<<s2;
	else cout<<"No substring";
	return 0;
}

错 #2和#5

#include <bits/stdc++.h>
using namespace std;
int main(){
	char s1[210],s2[210];
	cin>>s1>>s2;
	if(strlen(s1)>strlen(s2)){
		cout<<s2<<" is substring of "<<s1;
	}
	else cout<<s1<<" is substring of "<<s2;
	return 0;
}

有什么区别？？