Submission #104053

#	Time	Username	Problem	Language	Result	Execution time	Memory
104053		RockyB	The Big Prize (IOI17_prize)	C++17	98.07 / 100	47 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(r-l<=1) 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.F) return search(m,r);
	if((t.F==b.F)||!t.S) return search(l,m);
	if(rand()%2)
	{
		int df=search(l,m);
		if(~df) return df;
		return search(m,r);
	}
	int df=search(m,r);
	if(~df) return df;
	return search(l,m);
}
 
int find_best(int n) 
{
  srand('I' + 'O' + 'I');
	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;
	int ans = search(1,n-2);
	return ans;
}

Compilation message (stderr)

prize.cpp: In function 'int search(int, int)':
prize.cpp:28:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int m=l+r>>1;
        ~^~

• Subtask 1: 20 / 20
• Subtask 2: 78.07 / 80