Submission #1067375

#	Time	Username	Problem	Language	Result	Execution time	Memory
1067375		Ignut	The Big Prize (IOI17_prize)	C++17	20 / 100	38 ms	424 KiB

prize

// Ignut

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

vector<int> ask(int i);

int Q = 0;

int find_best(int n) {
	map<int, int> mp;
	int L = -1;
	while (L < n - 1) {
		int lo = L + 1, hi = n - 1;
		while (lo < hi) {
			int mid = lo + (hi - lo) / 2;
			Q ++;
			if (Q == 10000) {
				Q /= 0;
			}
			vector<int> vec = ask(mid);
			if (vec[0] + vec[1] == 0)
				return mid;
			int lvl = vec[0] + vec[1];
			int comp = 0;
			for (auto [a, b] : mp) if (a < lvl) comp += b;
			if (vec[0] > comp)
				hi = mid - 1;
			else {
				lo = mid + 1;
				mp[lvl] ++;
			}
		}
		Q ++;
		if (Q == 10000) {
			Q /= 0;
		}
		vector<int> vec = ask(lo);
		if (vec[0] + vec[1] == 0)
			return lo;
		int lvl = vec[0] + vec[1];
		mp[lvl] ++;
		L = lo;
	}
	return n - 1;
}

/*
8
3 2 3 1 3 3 2 3
*/

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:21:7: warning: division by zero [-Wdiv-by-zero]
   21 |     Q /= 0;
      |     ~~^~~~
prize.cpp:38:6: warning: division by zero [-Wdiv-by-zero]
   38 |    Q /= 0;
      |    ~~^~~~

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