Submission #1063476

#	Time	Username	Problem	Language	Result	Execution time	Memory
1063476		fv3	The Big Prize (IOI17_prize)	C++14	20 / 100	50 ms	3544 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>

using namespace std;

vector<int> st;
int nt = 1;

int get_range(int l, int r, int k, int x, int y)
{
	if (x > r || y < l) return 0;
	if (x >= l && y <= r) return st[k];
	int c = (x + y) / 2;
	return get_range(l, r, k*2, x, c) + get_range(l, r, k*2|1, c+1, y);
}

void add(int index)
{
	st[nt + index] = 1;
	for (int i = (nt + index) / 2; i >= 1; i /= 2)
		st[i] = st[i*2] + st[i*2|1];
}

vector<int> parent;
int find(int index)
{
	if (!parent[index]) return index;
	return parent[index] = find(parent[index]);
}

int find_best(int n)
{
	parent = vector<int>(n);

	while (nt < n) nt <<= 1;
	st = vector<int>(2 * nt);

	stack<int> stck;

	int mx_cnt = 1;
	while (1)
	{
		int l = 0, r = n - 1;
		while (1)
		{
			int c = (l + r) / 2;
			int index = find(c);

			auto val = ask(index);
			int cnt = val[0] + val[1]; 
			if (cnt == 0)
				return index;

			if (cnt > mx_cnt)
			{
				mx_cnt = cnt;
				while (!stck.empty())
				{
					add(stck.top());
					stck.pop();
				}
			}

			if (cnt < mx_cnt)
			{
				parent[index] = index + 1;
				add(index);
				break;
			}

			if (val[0] == get_range(0, index, 1, 0, nt-1))
				l = c + 1;
			else
				r = c - 1;
			stck.push(index);
		}

	}
	return 0;
}

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