String sort(2 test case in not passed)

#1

sir if one string is present as a prefix in another string then there first letter will also be same so i just compare there first character then done sorting but only 1 testcase is passing
please tell the erroe
#include<bits/stdc++.h>
using namespace std;
bool cmp(string s1,string s2)
{ int i=0;
if(s1[i]==s2[i])
{
return s1.length()>s2.length();
}
return s1<s2;
}
int main()
{
int n;
string s[1000];
cin>>n;
for(int i=0;i<n;i++)
{
cin>>s[i];
}
sort(s,s+n,cmp);
for(int i=0;i<n;i++)
{
cout<<s[i]<<endl;
}
return 0;
}

#2

you should only compare using length when one string is prefix of the other, you are just comparing the first element which is wrong

#3

sir if one string is present as a prefix in another string then there first letter will also be same so why should compare the whole string??

#4

bzt, batman, first letter is the same but first string is not the prefix of the other

#5

okk sir,got it thank u