제출 #80848

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
80848		farukkastamonuda	Norela (info1cup18_norela)	C++14	100 / 100	88 ms	804 KiB

norela

#include <bits/stdc++.h>
#define fi first
#define se second
#define lo long long 
#define inf 1000000000
#define md 1000000007
#define li 2005
#define mp make_pair
#define pb push_back
using namespace std;
int n, m, x, y;
lo int ans, gg, ind[80];
lo int bet(lo int a, lo int b){
	if(__builtin_popcount(a) < __builtin_popcount(b)) return a;
	if(__builtin_popcount(a) > __builtin_popcount(b)) return b;
	for(int i = 0;i < m; i ++){
		int x = a&(1 << i);
		int y = b&(1 << i);
		if(x < y) return b;
		if(y < x) return a; 
	}
	return a;
}
void dfs(int node, lo int msk, lo int ste){
	if(msk == gg){
		ans=bet(ans, ste);
		return ;
	}
	if(node == m + 1) return ; 
	dfs(node + 1, msk ^ ind[node], ste ^ (1 << (node - 1)));
	dfs(node + 1, msk, ste);
}
int main(){
	scanf("%d %d", &n, &m);
	gg = (1LL << n) - 1;
	ans = (1LL << m) - 1;
	for(int i = 1; i <= m; i ++){
		scanf("%d", &x);
		for(int j = 1;j <= x; j ++){
			scanf("%d", &y);
			y--;
			ind[i] ^= (1LL<<y);
		}
	}
	dfs(1, 0, 0);
	printf("%d\n", __builtin_popcount(ans));
	for(int i = 0; i < m; i ++){
		if(ans&(1 << i)) printf("%d ", i + 1);
	}
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

norela.cpp: In function 'int main()':
norela.cpp:34:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~~
norela.cpp:38:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &x);
   ~~~~~^~~~~~~~~~
norela.cpp:40:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &y);
    ~~~~~^~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 25 / 25
• Subtask 4: 25 / 25