Submission #852379

#	Time	Username	Problem	Language	Result	Execution time	Memory
852379		MilosMilutinovic	Tri (CEOI09_tri)	C++14	100 / 100	607 ms	5104 KiB

tri

#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,n) for (int i=a;i<n;i++)
#define per(i,a,n) for (int i=n-1;i>=a;i--)
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
#define SZ(x) ((int)(x).size())
typedef vector<int> VI;
typedef basic_string<int> B;
typedef long long ll;
typedef pair<int,int> PII;
typedef double db;
mt19937 mrand(random_device{}()); 
const ll mod=1000000007;
int rnd(int x) { return mrand() % x;}
ll powmod(ll a,ll b) {ll res=1;a%=mod; assert(b>=0); for(;b;b>>=1){if(b&1)res=res*a%mod;a=a*a%mod;}return res;}
ll gcd(ll a,ll b) { return b?gcd(b,a%b):a;}
// head

const int N=100100;
const int S=sqrt(N*15);
int n,m;

struct pt {
	int x,y;
	pt(int _x=0,int _y=0) : x(_x),y(_y) {}
}p[N];
vector<pt> ch[N];
int orient(pt a,pt b,pt c) {
	ll v=(b.y-a.y)*1ll*(c.x-b.x)-(b.x-a.x)*1ll*(c.y-b.y);
	return v==0?0:(v<0?-1:1);
}
bool const operator<(const pt& a,const pt& b) {
	if (orient(pt(0,0),a,b)==0) {
		return (a.x==b.x?a.y<b.y:a.x<b.x);
	}
	return orient(pt(0,0),a,b)>0;
}
bool in_tri(pt a,pt b,pt c,pt p) {
	return orient(a,b,p)!=-1&&orient(b,c,p)!=-1&&orient(c,a,p)!=-1;
}
int main() {
	scanf("%d%d",&n,&m);
	rep(i,0,n) {
		scanf("%d%d",&p[i].x,&p[i].y);
	}
	sort(p,p+n);
	rep(i,0,n) {
		ch[i/S].pb(p[i]);
	}
	rep(i,0,n+1) {
		if (ch[i].empty()) continue;
		vector<pt> hull;
		sort(all(ch[i]),[&](pt a,pt b) { return a.x<b.x||(a.x==b.x&&a.y<b.y); });
		for (auto& p:ch[i]) {
			while (SZ(hull)>=2&&orient(hull[SZ(hull)-2],hull[SZ(hull)-1],p)>=0) {
				hull.pop_back();
			}
			hull.pb(p);
		}
		ch[i]=hull;
	}
	while (m--) {
		pt a,b;
		scanf("%d%d%d%d",&a.x,&a.y,&b.x,&b.y);
		if (orient(b,pt(0,0),a)<=0) swap(a,b);
		int L,R;
		{
			L=n-1;
			int low=0,high=n-1;
			while (low<=high) {
				int mid=low+high>>1;
				if (orient(p[mid],pt(0,0),a)>=0) {
					L=mid;
					high=mid-1;
				} else {
					low=mid+1;
				}
			}
		}
		{
			R=0;
			int low=0,high=n-1;
			while (low<=high) {
				int mid=low+high>>1;
				if (orient(p[mid],pt(0,0),b)<=0) {
					R=mid;
					low=mid+1;
				} else {
					high=mid-1;
				}
			}
		}
		if (L>R) {
			printf("N\n");
			continue;
		}
		if (R-L<=S) {
			bool ok=false;
			rep(i,L,R+1) if (in_tri(a,b,pt(0,0),p[i])) ok=true;
			puts(ok?"Y":"N");
			continue;
		}
		bool ok=false;
		while (L%S!=0) {
			if (in_tri(a,b,pt(0,0),p[L])) ok=true;
			L++;
		}
		while (R>=L&&R%S!=S-1) {
			if (in_tri(a,b,pt(0,0),p[R])) ok=true;
			R--;
		}
		rep(i,L/S,R/S+1) {
			int sz=SZ(ch[i]);
			int low=0,high=sz-1;
			while (low<=high) {
				int mid=low+high>>1;
				if (in_tri(a,b,pt(0,0),ch[i][mid])) {
					ok=true;
					break;
				}
				if (mid+1==sz||(!in_tri(a,b,pt(0,0),ch[i][mid+1])&&orient(ch[i][mid],a,ch[i][mid+1])==1)) {
					high=mid-1;
				} else {
					low=mid+1;
				}
			}
			if (ok) break;
		}
		puts(ok?"Y":"N");
	}
}

Compilation message (stderr)

tri.cpp: In function 'int main()':
tri.cpp:76:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   76 |     int mid=low+high>>1;
      |             ~~~^~~~~
tri.cpp:89:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   89 |     int mid=low+high>>1;
      |             ~~~^~~~~
tri.cpp:121:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  121 |     int mid=low+high>>1;
      |             ~~~^~~~~
tri.cpp:47:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |  scanf("%d%d",&n,&m);
      |  ~~~~~^~~~~~~~~~~~~~
tri.cpp:49:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |   scanf("%d%d",&p[i].x,&p[i].y);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
tri.cpp:69:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |   scanf("%d%d%d%d",&a.x,&a.y,&b.x,&b.y);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100