Sukujuhla

input/code.cpp: In function 'int main()':
input/code.cpp:28:24: error: reference to 'hash' is ambiguous
   28 |                 v[i] = hash(v[i]);
      |                        ^~~~
In file included from /usr/include/c++/11/bits/basic_string.h:6860,
                 from /usr/include/c++/11/string:55,
                 from /usr/include/c++/11/bits/locale_classes.h:40,
                 from /usr/include/c++/11/bits/ios_base.h:41,
                 from /usr/include/c++/11/ios:42,
                 from /usr/include/c++/11/istream:38,
                 from /usr/include/c++/11/sstream:38,
                 from /usr/include/c++/11/complex:45,
                 from /usr/include/c++/11/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54,
                 from input/code.cpp:1:
/usr/include/c++/11/bits/functional_hash.h:59:12: note: candidates are: 'template<class _Tp> struct std::hash'
   59 |     struct hash;
      |            ^~~~
input/code.cpp:18:5: n...

#include <bits/stdc++.h>
 
#define N (1<<18)
#define ll long long
#define ld long double
#define M 1000000007
#define INF 1000000007
#define LINF 1000000000000000007LL
#define pii pair<int, int>
#define pll pair<long long, long long>
#define pb push_back
#define F first
#define S second
#define L length() - 1
 
using namespace std;
 
int hash (int n) {
	return (rand() + n) % 3;
}
 
int main () {
	int n, m, k;
	cin>>n>>m>>k;
	int v[2 * k + 1];
	for (int i = 0; i < 2 * k + 1; i++) {
		cin>>v[i];
		v[i] = hash(v[i]);
	}
	for (int i = 0; i <= k; i++) {
		while (v[i] == v[i + 1] || v[i + 1] == v[i + 2]) {
			v[i + 1] = (v[i + 1] + 1) % 3;
		}
	}
	cout<<v[k] + 1<<endl;
}