Submission #221476

#	Time	Username	Problem	Language	Result	Execution time	Memory
221476		galca	Mechanical Doll (IOI18_doll)	C++14	0 / 100	1 ms	204 KiB

doll

#include "doll.h"

// N + 1 = 15
// num_bits = 4
// we should have: 1 + 2 + 4 + 8

void create_circuit(int M, std::vector<int> A) {
	int N = A.size();
	std::vector<int> C(M + 1);
	
	for (int i = 0; i <= M; ++i) {
		C[i] = -1;
	}

	std::vector<int> X, Y;

	int num_bits = 0;
	int tmp = N + 1;
	while (tmp > 0) {
		++num_bits;
		tmp >>= 1;
	}

	for (int k = 1; k < num_bits; ++k) {
		int n_nodes = 1 << (k-1);
		for (int n = 0; n < n_nodes; n++) {
			X.push_back(-n * 2);
			Y.push_back(-(n * 2 + 1));
		}
	}

	// N nodes of the last level are connected to the triggers, the last one
	// 2^bits-N-1 to -1
	// and the last one to origin
	int n_leaves = 1 << (num_bits-1);

	int idx_b = X.size();
	for (int n = 0; n < n_leaves; n++) {
		X.push_back(-1);
		Y.push_back(-1);
	}

	for (int n = 0; n < N; n++) {
		// revert the number
		int n_inv = 0;
		int n_tmp = n;
		for (int l=0; l<num_bits; l++) {
			n_inv = (n_inv << 1) | (n_tmp & 1);
			n_tmp >>= 1;
		}
		if (n_inv & 1) {
			Y[idx_b + n_inv/2] = A[n];
		}
		else {
			X[idx_b + n_inv/2] = A[n];
		}
	}
	Y[idx_b + n_leaves - 1] = 0;

	answer(C, X, Y);
}

• Subtask 1: 0 / 2
• Subtask 2: 0 / 4
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 18
• Subtask 6: 0 / 56