Submission #292278

#	Time	Username	Problem	Language	Result	Execution time	Memory
292278		amiratou	Hotter Colder (IOI10_hottercolder)	C++14	78 / 100	3697 ms	8312 KiB

hottercolder

#include "grader.h"
#include <bits/stdc++.h>
#define rando mt19937 rng(chrono::steady_clock::now().time_since_epoch().count())
using namespace std;



map<pair<int,int>,int> mymap;


int HC(int N){
	mymap.clear();
	if(N==1)return 1;
	if(N==2){
		Guess(1);
		if(Guess(2)==1)return 2;
		return 1;
	}
	if(N==3){
		Guess(1);
		int k=Guess(3);
		if(!k)return 2;
		else if(k==1)return 3;
		else return 1;
	}
	int l=1,r=N,a,b,last=-1,h;
	if((r-l+1)<=5){
		Guess(l),h=Guess(r-2);
		if(!h)return l+1;
		else if(h==-1)return l;
		else{
			h=Guess(r);
			if(!h)return r-1;
			else if(h==1)return r;
			return r-2;
		}
	}
	while((r-l+1)>7){
		a=l+(r-l)/3,b=r-(r-l)/3;
		int med=(a+b)>>1;
		//cerr<<l<<" "<<r<<"\n";
		//cerr<<a<<" "<<b<<"\n";
		int A,B;
		if(mymap.count({a,b}))
			B=mymap[{a,b}];
		else{
			A=Guess(a),B=Guess(b),last=b;
			mymap[{a,b}]=B;
		}
		if(!B)return (a+b)/2;
		if(B==1)l=med+1;
		else r=med-(!((a+b)&1));
	}
	//cerr<<l<<" "<<r<<"\n";
	if((r-l+1)<=3){
		if(mymap.count({l,r}))
			h=mymap[{l,r}];
		else Guess(l),h=Guess(r);
		if(!h)return l+1;
		else if(h==1)return r;
		return l;
	}
	if((r-l+1)<=5){
		Guess(l),h=Guess(r-2);
		if(!h)return l+1;
		else if(h==-1)return l;
		else{
			h=Guess(r);
			if(!h)return r-1;
			else if(h==1)return r;
			return r-2;
		}
	}
	Guess(l),h=Guess(l+2);
	if(!h)return l+1;
	else if(h==-1)
		return l;
	else{
		h=Guess(r-2);
		if(!h)return r-3;
		else if(h==-1)return l+2;
		else{
			h=Guess(r);
			if(!h)return r-1;
			else if(h==1)return r;
			return r-2;
		}
	}
}

Compilation message (stderr)

hottercolder.cpp: In function 'int HC(int)':
hottercolder.cpp:43:7: warning: variable 'A' set but not used [-Wunused-but-set-variable]
   43 |   int A,B;
      |       ^
hottercolder.cpp:26:18: warning: variable 'last' set but not used [-Wunused-but-set-variable]
   26 |  int l=1,r=N,a,b,last=-1,h;
      |                  ^~~~

• Subtask 1: 25 / 25
• Subtask 2: 25 / 25
• Subtask 3: 25 / 25
• Subtask 4: 3 / 25