제출 #103200

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
103200		baluteshih	커다란 상품 (IOI17_prize)	C++14	90 / 100	82 ms	2076 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>
#define jizz ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define pb push_back
#define MP make_pair
#define F first
#define S second
#define ET cout << "\n"
#define MEM(i,j) memset(i,j,sizeof i)
#define ALL(v) v.begin(),v.end()
#define DB(a,s,e) {for(int i=s;i<e;++i) cerr << a[i] << " ";ET;}
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

pii arr[200005];
pii query(int x)
{
	if(~arr[x].F) return arr[x];
	auto v=ask(x);
	return arr[x]=MP(v[0],v[1]);
}

int search(int l,int r)
{
	if(l>r) return -1;
	if(l==r)
	{
		if(query(l)==MP(0,0)) return l;
		return -1;
	}
	int m=l+r>>1;
	pii a=query(l),b=query(r),t=query(m);
	if(t==MP(0,0)) return m;
	if((t.F==a.F&&t.S==a.S)||!t.F) return search(m+1,r);
	if((t.F==b.F&&t.S==b.S)||!t.S) return search(l,m-1);
	int df=search(l,m-1);
	if(~df) return df;
	return search(m+1,r);
}

int find_best(int n) 
{
	//srand(time(NULL));
	//for(int t=100;--t;)
	//	query(rand()%n);
	fill(arr,arr+n,MP(-1,-1));
	if(query(0)==MP(0,0)) return 0;
	if(query(n-1)==MP(0,0)) return n-1;
	return search(0,n-1);
}

컴파일 시 표준 에러 (stderr) 메시지

prize.cpp: In function 'int search(int, int)':
prize.cpp:33:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int m=l+r>>1;
        ~^~

• Subtask 1: 20 / 20
• Subtask 2: 70 / 80