Submission #277800

#	Time	Username	Problem	Language	Result	Execution time	Memory
277800		AKaan37	Amusement Park (CEOI19_amusementpark)	C++17	19 / 100	3037 ms	12160 KiB

amusementpark

//Bismillahirrahmanirrahim
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#include <bits/stdc++.h>

using namespace std;

typedef long long lo;
typedef pair< lo,lo > PII;

#define fi first
#define se second
#define mp make_pair
#define endl "\n"
#define int long long
#define pb push_back
#define fio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define FOR for(int i=1;i<=n;i++)
#define mid ((start+end)/2)
#define ort ((bas+son)/2)

const lo inf = 1000000000000000000;
const lo KOK = 100000;
const lo LOG = 30;
const lo li = 500005;
const lo mod = 1000000007;

int n,m,b[li],a[li],k,flag,t,vis[li],x[li],y[li];
int cev;
string s;
vector<int> v[li];

inline void f(int sira,int mask){
	if(sira==m){
		FOR vis[i]=0;
		FOR v[i].clear();
		int say=0;
		for(int i=0;i<m;i++){
			if((mask&(1ll<<i))==0){vis[y[i]]++;v[x[i]].pb(y[i]);}
			else{vis[x[i]]++;v[y[i]].pb(x[i]);say++;}
		}
		queue<int> q;
		FOR{
			if(vis[i]==0)q.push(i);
		}
		int cevv=0;
		while(q.size()){
			int node=q.front();
			q.pop();
			cevv++;
			for(int i=0;i<(int)v[node].size();i++){
				int go=v[node][i];
				if(vis[go]==1)q.push(go);
				vis[go]--;
			}
		}
		if(cevv==n)cev+=say;
		return ;
	}
	f(sira+1,mask);
	f(sira+1,(mask|(1<<sira)));
}

main(void){
	scanf("%lld %lld",&n,&m);
	for(int i=0;i<m;i++){
		scanf("%lld %lld",&x[i],&y[i]);
	}
	f(0,0);
	printf("%lld\n",cev);
	return 0;
}

Compilation message (stderr)

amusementpark.cpp:66:10: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   66 | main(void){
      |          ^
amusementpark.cpp: In function 'int main()':
amusementpark.cpp:67:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   67 |  scanf("%lld %lld",&n,&m);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~
amusementpark.cpp:69:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   69 |   scanf("%lld %lld",&x[i],&y[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 12 / 12
• Subtask 3: 0 / 23
• Subtask 4: 0 / 21
• Subtask 5: 0 / 37