766A - Mahmoud and Longest Uncommon Subsequence - CodeForces Solution

constructive algorithms strings *1000

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Python Code: 

def calc_unseq_string(a, b):
    if b not in a:
        return len(b)
    return calc_unseq_string(b[1:], a)


a = input()
b = input()
if a == b:
    print(-1)
else:
    sequence1 = calc_unseq_string(a, b)
    sequence2 = calc_unseq_string(b, a)
    print(max(sequence1, sequence2))

C++ Code: 

#include <iostream>

using namespace std;

int main()
{
    string a,b;
    cin>>a>>b;
    if (a==b)
        cout <<-1<<"\n";
    if (a!=b)
        if (a.size()>b.size())
        cout <<a.size()<<"\n";
    else
        cout <<b.size()<<"\n";



    return 0;
}


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