제출 #696780

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
696780		vjudge1	Amusement Park (CEOI19_amusementpark)	C++17	100 / 100	2377 ms	3720 KiB

amusementpark

#include<bits/stdc++.h>
using namespace std;
const int N=18,mod=998244353,inv2=499122177;
int n,m,a[500],b[500],coef[1<<N],dp[1<<N],d[1<<N];
int main(){
	scanf("%d%d",&n,&m);
	dp[0]=1;
	coef[0]=mod-1;
	for(int i=1;i<1<<n;i++)coef[i]=mod-coef[i&(i-1)];
	for(int i=1;i<=m;i++)scanf("%d%d",&a[i],&b[i]),a[i]--,b[i]--;
	for(int i=1;i<1<<n;i++){
		for(int o=1;o<=m;o++){
			if((i>>a[o]&1)&&(i>>b[o]&1))d[i]=1;
		}
	}
	for(int i=1;i<1<<n;i++){
		for(int o=i;o;o=((o-1)&i)){
			if(!d[o])dp[i]=(dp[i]+1ll*dp[i^o]*coef[o])%mod;
		}
	}
	printf("%lld\n",1ll*dp[(1<<n)-1]*m%mod*inv2%mod);
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

amusementpark.cpp: In function 'int main()':
amusementpark.cpp:6:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    6 |  scanf("%d%d",&n,&m);
      |  ~~~~~^~~~~~~~~~~~~~
amusementpark.cpp:10:28: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |  for(int i=1;i<=m;i++)scanf("%d%d",&a[i],&b[i]),a[i]--,b[i]--;
      |                       ~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 12 / 12
• Subtask 3: 23 / 23
• Subtask 4: 21 / 21
• Subtask 5: 37 / 37