Submission #585335

#	Time	Username	Problem	Language	Result	Execution time	Memory
585335		Vanilla	The Big Prize (IOI17_prize)	C++17	20 / 100	21 ms	1068 KiB

prize

#include <bits/stdc++.h>
#include "prize.h"
using namespace std;
int nr[] = {1, 2, 5, 26, 677};
int vmx = 0, vpos = 0;
const int maxn = 2e5 + 2;
int pref [maxn];
int mark [maxn];

void upd (int x) {
	mark[x] = 1;
	for (int i = x; i < maxn; i++){
		pref[i]++;
	}
}

int find_best(int n) {
	for (int i = 0; i < min(500, n); i++){
		vector <int> k = ask(i);
		if (k[0] + k[1] > vmx) {
			vmx = k[0] + k[1];
			vpos = i;
		}
	}
	for (int i = 0; i < vmx; i++){
		int l = 0, r = n - 1;
		while (l <= r) {
			int mid = (l + r) / 2;
			// cout << i << " " << l << " " << r << "\n";
			vector <int> k = ask(mid);
			if (k[0] + k[1] == 0) return mid;
			if (k[0] + k[1] != vmx && !mark[mid]) {
				// cout << mid << "\n";
				upd(mid);
				break;
			}
			if (k[0] - pref[mid]) {
				r = mid - 1;
			}
			else {
				l = mid + 1;
			}
		}
	}
	// assert(0);
	return -1;
	
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 80