Submission #966207

#	Time	Username	Problem	Language	Result	Execution time	Memory
966207		42kangaroo	Prisoner Challenge (IOI22_prison)	C++17	10 / 100	4 ms	604 KiB

prison

#include "prison.h"

#include <vector>

std::vector<std::vector<int>> devise_strategy(int N) {
	using namespace std;
	vector<vector<int>> strat(26, vector<int>(N + 1, 0));
	strat[0][0] = 0;
	for (int i = 0; i < N; ++i) {
		strat[0][i + 1] = ((i + 1) >> 11) + 1;
	}
	strat[1][0] = strat[2][0] = strat[3][0] = 1;
	for (int i = 1; i < 4; ++i) {
		for (int j = 0; j < N; ++j) {
			if ((j + 1) >> 11 == i - 1) {
				strat[i][j + 1] = 4 + (((j + 1) >> 10) % 2);
			} else if ((j + 1) >> 11 > i - 1) strat[i][j + 1] = -2;
			else strat[i][j + 1] = -1;
		}
	}
	for (int i = 0; i < 9; ++i) {
		strat[4 + 2 * i][0] = strat[5 + 2 * i][0] = i % 2;
		for (int j = 0; j < N; ++j) {
			if (((j + 1) >> (11 - i)) % 2 == 0) {
				strat[5 + 2 * i][j + 1] = -1 - (i) % 2;
				strat[4 + 2 * i][j + 1] = 6 + 2 * i + ((j + 1) >> (10 - i)) % 2;
			} else {
				strat[4 + 2 * i][j + 1] = -1 - (i + 1) % 2;
				strat[5 + 2 * i][j + 1] = 6 + 2 * i + ((j + 1) >> (10 - i)) % 2;
			}
		}
	}
	strat[22][0] = strat[23][0] = 1;
	for (int i = 0; i < N; ++i) {
		if (((i + 1) >> 2) % 2 == 0) {
			strat[23][i + 1] = -2;
			if (i % 4 == 3) {
				strat[22][i + 1] = -2;
			} else if (i % 4 == 2) {
				strat[22][i + 1] = -1;
			} else {
				strat[22][i + 1] = 24 + i % 2;
			}
		} else {
			strat[22][i + 1] = -1;
			if (i % 4 == 3) {
				strat[23][i + 1] = -2;
			} else if (i % 4 == 2) {
				strat[23][i + 1] = -1;
			} else {
				strat[23][i + 1] = 24 + i % 2;
			}
		}
	}
	strat[24][0] = strat[25][0] = 0;
	for (int i = 0; i < N; ++i) {
		strat[24][i + 1] = -1 - (((i + 1) % 4) > 1);
		strat[25][i + 1] = -1 - (((i + 1) % 4) > 2);
	}
	return strat;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 0 / 90