Submission #1626135

---

Source Code Expand

#include<cstdio>
using namespace std;
int beg[200100],nex[501000],tto[500100],e;
int cnt1[200100],cnt2[200100];
void putin(int s,int t){
	tto[++e]=t;
	nex[e]=beg[s];
	beg[s]=e;
}
bool vis[200100];
void dfs(int u){
	if(vis[u]) return;
	vis[u]=1;
	for(int i=beg[u];i;i=nex[i])
		dfs(tto[i]);
}
int main(){
//	freopen("E.in","r",stdin);
	int n,h;
	scanf("%d%d",&n,&h);
	int A,B,C,D;
	for(int i=1;i<=n;i++){
		scanf("%d%d%d%d",&A,&B,&C,&D);
		if(C>0){
			putin(n+C,i);
			putin(i,n+C);
			cnt1[n+C]++;
		}
		else{
			putin(n+A,i);
			putin(i,n+A);
			cnt2[n+A]++;
		}
		if(D>0){
			putin(n+D+h,i);
			putin(i,n+D+h);
			cnt1[n+D+h]++;
		}
		else{
			putin(n+B+h,i);
			putin(i,n+B+h);
			cnt2[n+B+h]++;
		}
	}
	for(int i=1;i<=h+h;i++){
		if(cnt1[n+i]>cnt2[n+i]){
			printf("NO\n");
			return 0;
		}
	}
	for(int i=1;i<=h+h;i++)
		if(cnt2[n+i]>cnt1[n+i])
			dfs(n+i);
	for(int i=1;i<=n;i++){
		if(!vis[i]){
			printf("NO\n");
			return 0;
		}
	}
	printf("YES\n");
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:20:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&h);
                     ^
./Main.cpp:23:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d%d",&A,&B,&C,&D);
                                ^

Judge Result