Submission #59001

#	Time	Username	Problem	Language	Result	Execution time	Memory
59001		tugushka	The Big Prize (IOI17_prize)	C++14	97.31 / 100	73 ms	1212 KiB

prize

#include "prize.h"
#include<bits/stdc++.h>
using namespace std;

vector < int > res, a;
map < int, vector < int > > x;
map < int , int > cnt;
int sq, mx;

int find_best(int n){
	int now = 0, low = 0;
	sq = sqrt(n);
	
	/*
	for( ; now < min(sq+30, n-1) ; now++ ){
		res = ask(now);
		x[now] = res;
		cnt[res[0]+res[1]]++;
		mx = max( res[0]+res[1], mx );
		if( res[0] == 0 && res[1] == 0 ) return now;
	}
	
	for( map < int, int > :: iterator it = cnt.begin() ; it != cnt.end() ; it++ ){
		if( it -> first != mx ) low += it->second;
	}
	*/
	
	while( 1 ){
		if( x[now].empty() ) res = ask(now);
		else res = x[now];
		x[now] = res;
		mx = max(mx, res[0]+res[1]);
		if( res[0] == 0 && res[1] == 0 ) return now;
		
		if( res[0]+res[1] == mx ){
			int l = now+1, r = min(n-1, now + 3*sq);
			while( l < r ){
				int mid = (l+r+1)/2;
				if( x[mid].empty() )
					a = ask(mid),
					x[mid] = a;
				else a = x[mid];
				
				if( !a[0] && !a[1] ) return mid;
				
				if( res[0] == a[0] && res[1] == a[1] )
					l = mid;
				else r = mid-1;
			}
			now = l+1;
		}
		else now++;
	}
	return 0;
}

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:11:15: warning: unused variable 'low' [-Wunused-variable]
  int now = 0, low = 0;
               ^~~

• Subtask 1: 20 / 20
• Subtask 2: 77.31 / 80