Submission #1776260

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Source Code Expand

#include <iostream>
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>
#include <string>
#include <bitset>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <algorithm>
#include <sstream>
#include <stack>
#include <iomanip>
using namespace std;
#define pb push_back
#define mp make_pair
typedef pair<int,int> pii;
typedef long long ll;
typedef double ld;
typedef vector<int> vi;
#define fi first
#define se second
#define fe first
#define FO(x) {freopen(#x".in","r",stdin);freopen(#x".out","w",stdout);}
#define Edg int M=0,fst[SZ],vb[SZ],nxt[SZ];void ad_de(int a,int b){++M;nxt[M]=fst[a];fst[a]=M;vb[M]=b;}void adde(int a,int b){ad_de(a,b);ad_de(b,a);}
#define Edgc int M=0,fst[SZ],vb[SZ],nxt[SZ],vc[SZ];void ad_de(int a,int b,int c){++M;nxt[M]=fst[a];fst[a]=M;vb[M]=b;vc[M]=c;}void adde(int a,int b,int c){ad_de(a,b,c);ad_de(b,a,c);}
#define es(x,e) (int e=fst[x];e;e=nxt[e])
#define esb(x,e,b) (int e=fst[x],b=vb[e];e;e=nxt[e],b=vb[e])
#define SZ 666666
int M=0,fst[SZ],vb[SZ],nxt[SZ],in[SZ],ou[SZ];
int ff[SZ];
int gf(int x) {return ff[x]?ff[x]=gf(ff[x]):x;}
void uni(int a,int b)
{
	int ga=gf(a),gb=gf(b);
	if(ga^gb) ff[ga]=gb;
}
void ad_de(int a,int b)
{++in[b]; ++ou[a]; uni(a,b);
++M;nxt[M]=fst[a];fst[a]=M;vb[M]=b;}
int n,h;
bool bb[SZ];
#define GG {puts("NO"); exit(0);}
int main()
{
	scanf("%d%d",&n,&h);
	for(int i=1,a,b,c,d,l,r;i<=n;++i)
	{
		scanf("%d%d%d%d",&a,&b,&c,&d);
		if(!c) l=a; else l=-c;
		if(!d) r=-b; else r=d;
		ad_de(l+n+1,r+n+1);
	}
	for(int i=n+1;i<=n+n;++i)
		if(ou[i]<in[i]) GG
	for(int i=1;i<=n;++i)
		if(in[i]<ou[i]) GG
	for(int i=1;i<=n+n;++i)
		if(in[i]!=ou[i]) bb[gf(i)]=1;
	for(int i=1;i<=n+n;++i)
		if((in[i]||ou[i])&&gf(i)==i&&!bb[i]) GG
	puts("YES");
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:49:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&h);
                     ^
./Main.cpp:52:32: 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