main.cpp

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#include <bits/stdc++.h>
 
using namespace std;
 
class Solution
{
public:
    char repeatedCharacter(string s)
    {
        set<char> characters;
        for (char c: s)
        {
            if (characters.find(c) != characters.end())
                return c;
            else
                characters.insert(c);
        }
        return '\0';
    }
};
 
int main()
{
 
    return 0;
}