Submission #530328

#	Time	Username	Problem	Language	Result	Execution time	Memory
530328		fhvirus	Minerals (JOI19_minerals)	C++17	85 / 100	62 ms	3304 KiB

minerals

#include "minerals.h"
#include <bits/stdc++.h>
using namespace std;

namespace {

bool query(int x) {
	static int lst = 0;
	int cur = Query(x);
	int ans = lst ^ cur;
	lst = cur;
	return ans;
}

void solve(vector<int> a, vector<int> b, bool in) {
	int n = a.size(), m = ceil(n * .40);
	if (n == 0) return;
	if (n == 1) { Answer(a[0], b[0]); return; }
	if (in) for (int i = n - 1; i >= m; --i) query(a[i]);
	else    for (int i = 0; i < m; ++i) query(a[i]);
	random_shuffle(begin(b), end(b));
	vector<int> bl, br;
	for (const int& i: b) {
		bool go_l = (bl.size() < m and (br.size() == n - m or !query(i)));
		(go_l ? bl : br).emplace_back(i);
	}
	solve(vector<int>(begin(a), begin(a) + m), bl, true);
	solve(vector<int>(begin(a) + m, end(a)), br, false);
}

}

void Solve(int N) {
	vector<int> a, b;
	for (int i = 1; i <= N * 2; ++i)
		(query(i) ? b : a).emplace_back(i);
	solve(a, b, true);
}

Compilation message (stderr)

minerals.cpp: In function 'void {anonymous}::solve(std::vector<int>, std::vector<int>, bool)':
minerals.cpp:24:26: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   24 |   bool go_l = (bl.size() < m and (br.size() == n - m or !query(i)));
      |                ~~~~~~~~~~^~~
minerals.cpp:24:45: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   24 |   bool go_l = (bl.size() < m and (br.size() == n - m or !query(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