Submission #3416069

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Source Code Expand

#include<algorithm>
#include<iostream>
#include<cstring>
#include<cstdio>
#include<cmath>
#define LL long long
#define M 400020
using namespace std;
int read(){
	int nm=0,fh=1; int cw=getchar();
	for(;!isdigit(cw);cw=getchar()) if(cw=='-') fh=-fh;
	for(;isdigit(cw);cw=getchar()) nm=nm*10+(cw-'0');
	return nm*fh;
}
int H,W,n,X[M],Y[M],XX[M],YY[M],L[M<<2],R[M<<2],od[M<<2];
bool on(int x,int y){return x==0||y==0||x==H||y==W;}
int bas(int x,int y){if(!x)return y;if(y==W)return W+x;if(x==H)return W+H+W-y;return W+H+W-x;}
bool cmp(int x,int y){return R[x]<R[y]||(R[x]==R[y]&&L[x]>L[y]);}
int main(){
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	H=read(),W=read(),n=read();
	for(int i=1;i<=n;i++){
		X[i]=read(),Y[i]=read(),XX[i]=read(),YY[i]=read(),od[i]=i;
		if(!on(X[i],Y[i])||!on(XX[i],YY[i])) i--,n--;
		L[i]=bas(X[i],Y[i]),R[i]=bas(XX[i],YY[i]);
		if(L[i]>R[i]) swap(L[i],R[i]);
	}
	for(int i=1;i<=n;i++) L[i+n]=R[i],R[i+n]=L[i]+W+H+W+H,od[i+n]=i+n;
	n<<=1,sort(od+1,od+n+1,cmp);
	for(int i=1;i<=n;i++) od[i+n]=od[i]+n,L[i+n]=L[i]+W+H+W+H,R[i+n]=R[i]+W+H+W+H; n<<=1;
	for(int i=2;i<=n;i++) if(L[od[i-1]]<L[od[i]]&&R[od[i-1]]<R[od[i]]&&L[od[i]]<R[od[i-1]]){puts("NO");return 0;}
	puts("YES"); return 0;
}

Submission Info

Judge Result