Submission #63557

#	Time	Username	Problem	Language	Result	Execution time	Memory
63557		yu0524	Watching (JOI13_watching)	C++14	0 / 100	1083 ms	848 KiB

watching

#include <iostream>
#include <algorithm>
#include <vector>
#include <string.h>
#include <queue>
using namespace std;
typedef long long ll;
int N, p, q, a;
vector<ll> arr;

int func(ll w, int cur = 0, int sw = p, int bw = q) {
	if (sw <= 0 && bw <= 0) return 0;
	if (cur >= arr.size()) return 1;
	bool chk1 = 0, chk2 = 0;
	for (int i = cur+1; i < arr.size(); ++i) {
		if (arr[i] - arr[cur] + 1 > w && chk1 == 0 && sw) {
			chk1 = 1;
			if (func(w, i, sw - 1, bw)) return 1;
		}

		if (arr[i] - arr[cur] + 1 > 2 * w && chk2 == 0 && bw) {
			chk2 = 1;
			if (func(w, i, sw, bw - 1)) return 1;
		}
	}

	if (chk1 == 0 && sw) return 1;
	if (chk2 == 0 && bw) return 1;
	return 0;
}

int main() {
	cin.tie(NULL);
	ios::sync_with_stdio(false);

	cin >> N;
	cin >> p >> q;

	for (int i = 0; i < N; ++i) {
		cin >> a;
		arr.push_back(a);
	}
	sort(arr.begin(), arr.end());
	arr.resize(distance(arr.begin(), unique(arr.begin(), arr.end())));
	ll x = 1, y = 1000000000, mid, res;

	while (x <= y) {
		mid = (x + y) >> 1;
		
		if (func(mid)) {
			y = mid - 1;
			res = mid;
		}
		else {
			x = mid + 1;
		}
	}

	cout << res;
}

Compilation message (stderr)

watching.cpp: In function 'int func(ll, int, int, int)':
watching.cpp:13:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (cur >= arr.size()) return 1;
      ~~~~^~~~~~~~~~~~~
watching.cpp:15:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = cur+1; i < arr.size(); ++i) {
                      ~~^~~~~~~~~~~~

• Subtask 1: 0 / 50
• Subtask 2: 0 / 50