delete pics to save space

2.1398.cpp

@@ -0,0 +1,60 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+const int maxn=100010;
+int T,w,h,n,e;
+struct Event
+{
+	double x;
+	int type;
+	inline bool operator<(const Event &b) const
+	{ return x<b.x||(x==b.x&&type>b.type); }
+} events[maxn*2];
+void update(int x,int a,int w,double &L,double &R)
+{
+	if(a==0) { if(x<=0||x>=w) R=L-1; }
+	else if(a>0)
+	{
+		L=max(L,-(double)x/a);
+		R=min(R,(double)(w-x)/a);
+	}
+	else
+	{
+		L=max(L,(double)(w-x)/a);
+		R=min(R,-(double)x/a);
+	}
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d",&T);
+	while(T-->0)
+	{
+		e=0;
+		scanf("%d%d%d",&w,&h,&n);
+		for(int i=0;i<n;i++)
+		{
+			int x,y,a,b;
+			scanf("%d%d%d%d",&x,&y,&a,&b);
+			double L=0,R=1e9;
+			update(x,a,w,L,R);
+			update(y,b,h,L,R);
+			if(R>L)
+			{
+				events[e++]=(Event){L,0};
+				events[e++]=(Event){R,1};
+			}
+		}
+		sort(events,events+e);
+		int cnt=0,res=0;
+		for(int i=0;i<e;i++)
+		{
+			if(events[i].type==0) res=max(res,++cnt);
+			else cnt--;
+		}
+		printf("%d\n",res);
+	}
+	return 0;
+}