Submission #994353

#	Time	Username	Problem	Language	Result	Execution time	Memory
994353		prvocislo	Minerals (JOI19_minerals)	C++17	85 / 100	36 ms	3120 KiB

minerals

#include "minerals.h"
#include <algorithm>
#include <bitset>
#include <cassert>
#include <chrono>
#include <cmath>
#include <deque>
#include <iomanip>
#include <iostream>
#include <map>
#include <queue>
#include <random>
#include <set>
#include <string>
#include <vector>
typedef long long ll;
typedef long double ld;
using namespace std;

vector<int> p;
vector<int> h1, h2;
int c = 0; // kolko z h1 je vnutri?
int lst = 0;
bool other(int x) // je druhy prvok typu x vnutri?
{
	int now = Query(p[x]);
	if (now != lst) return lst = now, false;
	return lst = now, true;
}
void go(int c2)
{
	while (c > c2) lst = Query(p[h1[--c]]);
	while (c < c2) lst = Query(p[h1[c++]]);
}
void solve(int l, int r, vector<int> b)
{
	if (l == r)
	{
		Answer(p[h1[l - 1]], p[b[0]]);
		return;
	}
	int m = (l + r) / 2;
	if (c > m) min(max(l, r - (1 * (r - l)) / 3), r - 1);
	if (c < m) min(max(l, l + (1 * (r - l)) / 3), r - 1);
	go(m);
	vector<int> bl, br;
	for (int i : b)
	{
		if (bl.size() == m - l + 1)
		{
			br.push_back(i);
		}
		else if (br.size() == r - m)
		{
			bl.push_back(i);
		}
		else
		{
			if (other(i)) bl.push_back(i);
			else br.push_back(i);
		}
	}
	solve(l, m, bl);
	solve(m + 1, r, br);
}
int rnd()
{
	return ((rand() % 10000) * 10000 + (rand() % 10000));
}
void Solve(int n)
{
	for (int i = 0; i <= 2 * n; i++) p.push_back(i);
	for (int i = 1; i <= 2 * n; i++) swap(p[i], p[1 + rnd() % i]);
	for (int i = 1; i <= 2 * n; i++)
	{
		if (h1.size() == n || other(i)) h2.push_back(i);
		else h1.push_back(i), c++;
	}
	solve(1, n, h2);
}

Compilation message (stderr)

minerals.cpp: In function 'void solve(int, int, std::vector<int>)':
minerals.cpp:49:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   49 |   if (bl.size() == m - l + 1)
      |       ~~~~~~~~~~^~~~~~~~~~~~
minerals.cpp:53:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   53 |   else if (br.size() == r - m)
      |            ~~~~~~~~~~^~~~~~~~
minerals.cpp: In function 'void Solve(int)':
minerals.cpp:76:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   76 |   if (h1.size() == n || other(i)) h2.push_back(i);
      |       ~~~~~~~~~~^~~~

• Subtask 1: 6 / 6
• Subtask 2: 25 / 25
• Subtask 3: 9 / 9
• Subtask 4: 30 / 30
• Subtask 5: 5 / 5
• Subtask 6: 5 / 5
• Subtask 7: 5 / 5
• Subtask 8: 0 / 5
• Subtask 9: 0 / 10