#include <bits/stdc++.h> /// #pragma GCC optimize ("Ofast") /// #pragma GCC target ("avx2") /// #pragma GCC optimize("unroll-loops") using namespace std; using ll = long long; using ii = pair<ll, ll>; using vi = vector<int>; #define ff first #define ss second #define pb push_back #define all(x) (x).begin(), (x).end() #define lb lower_bound /// #define int ll const int oo = 1e9 + 7; string solve_puzzle(string s, int k, int c[]) { int n = s.length(); string res(n, '?'); return res; }

/usr/bin/ld: /tmp/ccdAQTcG.o: in function `main':
grader.cpp:(.text.startup+0x213): undefined reference to `solve_puzzle(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status