Submission #1129965

#	Time	Username	Problem	Language	Result	Execution time	Memory
1129965		mnbvcxz123	Amusement Park (CEOI19_amusementpark)	C++20	Compilation error	0 ms	0 KiB

amusementpark

#include<bits/stdc++.h>
using namespace std;
using ll=long long;

const int N = 18;
const int M = 998244353;
int a[N];
bool indepset[1 << N];
int popcnt[1 << N];
int arg[1 << N];
int nodeid[1 << N];
ll dp[1 << N];
int main() {
	int n, m;
	cin >> n >> m;
	for (int i = 1; i <= m; i++) {
		int u, v;
		cin >> u >> v;
		u--;
		v--;
		a[u] |= 1 << v;
		a[v] |= 1 << u;
	}
	for (int i = 0; i < n; i++) { nodeid[1 << i] = i; }
	for (int i = 0; i < (1 << n); i++) {
		popcnt[i] = popcnt[i >> 1] + (i & 1);
		arg[i] = (popcnt[i] % 2) * 2 - 1;
	}
	indepset[0] = 1;
	for (int i = 1; i < (1 << n); i++) {
		if (indepset[i & (i - 1)] && (a[nodeid[i & (-i)]] & (i & (i - 1))) == 0) {
			indepset[i] = true;
		}
	}
	f[0] = 1;
	for (int i = 1; i < (1 << n); i++) {
		for (int j = i; j; j = (j - 1) & i) {
			if (indepset[j]) { dp[i] = (dp[i] + arg[j] * dp[i ^ j]) % M; }
		}
	}
	dp[(1 << n) - 1] = (dp[(1 << n) - 1] + M) % M;
	cout << dp[(1 << n) - 1] * m % M * ((M + 1) / 2) % M;
	return 0;
}

Compilation message (stderr)

amusementpark.cpp: In function 'int main()':
amusementpark.cpp:27:17: error: reference to 'arg' is ambiguous
   27 |                 arg[i] = (popcnt[i] % 2) * 2 - 1;
      |                 ^~~
In file included from /usr/include/c++/11/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54,
                 from amusementpark.cpp:1:
/usr/include/c++/11/complex:1852:5: note: candidates are: 'template<class _Tp> typename __gnu_cxx::__promote<_Tp>::__type std::arg(_Tp)'
 1852 |     arg(_Tp __x)
      |     ^~~
/usr/include/c++/11/complex:653:5: note:                 'template<class _Tp> _Tp std::arg(const std::complex<_Tp>&)'
  653 |     arg(const complex<_Tp>& __z) { return __complex_arg(__z.__rep()); }
      |     ^~~
amusementpark.cpp:10:5: note:                 'int arg [262144]'
   10 | int arg[1 << N];
      |     ^~~
amusementpark.cpp:35:9: error: 'f' was not declared in this scope
   35 |         f[0] = 1;
      |         ^
amusementpark.cpp:38:61: error: reference to 'arg' is ambiguous
   38 |                         if (indepset[j]) { dp[i] = (dp[i] + arg[j] * dp[i ^ j]) % M; }
      |                                                             ^~~
In file included from /usr/include/c++/11/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54,
                 from amusementpark.cpp:1:
/usr/include/c++/11/complex:1852:5: note: candidates are: 'template<class _Tp> typename __gnu_cxx::__promote<_Tp>::__type std::arg(_Tp)'
 1852 |     arg(_Tp __x)
      |     ^~~
/usr/include/c++/11/complex:653:5: note:                 'template<class _Tp> _Tp std::arg(const std::complex<_Tp>&)'
  653 |     arg(const complex<_Tp>& __z) { return __complex_arg(__z.__rep()); }
      |     ^~~
amusementpark.cpp:10:5: note:                 'int arg [262144]'
   10 | int arg[1 << N];
      |     ^~~