Submission #135660

#	Time	Username	Problem	Language	Result	Execution time	Memory
135660		win11905	The Big Prize (IOI17_prize)	C++11	90 / 100	92 ms	508 KiB

prize

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

int con = 500;

int find_best(int n) {
	if(n < con) {
		for(int i = 0; i < n; ++i) {
			vector<int> ret = ask(i);
			if(ret[0] + ret[1] == 0) return i;
		}
	}
	int mx = 0;
	for(int i = 0; i < con; ++i) {
		vector<int> ret = ask(i);
		mx = max(mx, ret[0] + ret[1]);
		if(ret[0] + ret[1] == 0) return i;
	}
	int ptr = con;
	while(ptr < n) {
		vector<int> ret = ask(ptr);
		if(ret[0] + ret[1] == 0) return ptr;
		if(ret[0] + ret[1] == mx) {
			int l = ptr, r = n-1;
			while(l < r) {
				int m = (l + r + 1) >> 1;
				if(ret == ask(m)) l = m;
				else r = m-1;
			}
			ptr = l;
		}
		ptr++;
	}
	return 0;
}

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