This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "paint.h"
#include <bits/stdc++.h>
using namespace std;
string solve_puzzle(string s, vector<int> c) {
    int n = s.size();
    if(n==c[0]) {
        return string(n, 'X');
    }
    return string(n, '?');
}
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