Submission #1051001

#	Time	Username	Problem	Language	Result	Execution time	Memory
1051001		rainboy	How to Avoid Disqualification in 75 Easy Steps (CEOI23_avoid)	C++17	15 / 100	418 ms	263068 KiB

avoid

#include "avoid.h"
#include <vector>

using namespace std;

const int N = 1000, LN = 10, L = 26;

typedef vector<int> vi;
typedef pair<int, int> pi;

int count(int b) {
	return b == 0 ? 0 : count(b & b - 1) + 1;
}

pi scout(int q, int b) {
	if (q == 10) {
		for (int l = 0; l < LN; l++) {
			vi ii;
			for (int i = 0; i < N; i++)
				if ((i >> l & 1) != 0)
					ii.push_back(i + 1);
			send(ii);
		}
		vi cc = wait();
		int i = 0;
		for (int l = 0; l < LN; l++)
			if (cc[l])
				i |= 1 << l;
		return { i + 1, i + 1 };
	} else if (q == 20) {
		int lower = 0, upper = N;
		while (upper - lower > 1) {
			int m = (lower + upper) / 2;
			vi ii;
			for (int i = lower; i < m; i++)
				ii.push_back(i + 1);
			send(ii);
			if (wait()[0])
				upper = m;
			else
				lower = m;
		}
		int i_ = lower;
		lower = 0, upper = N + 1;
		while (upper - lower > 1) {
			int m = (lower + upper) / 2;
			vi ii;
			for (int i = lower; i < m; i++)
				if (i != i_)
					ii.push_back(i + 1);
			if (ii.size() == 0) {
				lower = m;
				continue;
			}
			send(ii);
			if (wait()[0])
				upper = m;
			else
				lower = m;
		}
		int j_ = lower;
		if (j_ == N)
			j_ = i_;
		return { i_ + 1, j_ + 1 };
	} else {
		vi bb(N), ij(1 << L, -1);
		for (int j = 0, b = 0; j < N; j++) {
			bool good = false;
			while (b < 1 << L) {
				bb[j] = b++;
				if (count(bb[j]) != L / 3)
					continue;
				good = true;
				for (int i = 0; i <= j; i++)
					if (ij[bb[j] | bb[i]] != -1) {
						good = 0;
						break;
					}
				if (good) {
					for (int i = 0; i <= j; i++)
						ij[bb[j] | bb[i]] = i * N + j;
					break;
				}
			}
			if (!good)
				return { -1, -1 };
		}
		for (int l = 0; l < L; l++) {
			vi ii;
			for (int i = 0; i < N; i++)
				if ((bb[i] >> l & 1) != 0)
					ii.push_back(i + 1);
			send(ii);
		}
		vi cc = wait();
		int b = 0;
		for (int l = 0; l < LN; l++)
			if (cc[l])
				b |= 1 << l;
		int i = ij[b] / N, j = ij[b] % N;
		return { i + 1, j + 1 };
	}
}

Compilation message (stderr)

avoid.cpp: In function 'int count(int)':
avoid.cpp:12:34: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   12 |  return b == 0 ? 0 : count(b & b - 1) + 1;
      |                                ~~^~~

• Subtask 0: 0 / 0
• Subtask 1: 10 / 10
• Subtask 2: 5 / 5
• Subtask 3: 0 / 10
• Subtask 4: 0 / 75