Submission #1215872

#	Time	Username	Problem	Language	Result	Execution time	Memory
1215872		bangan	Prisoner Challenge (IOI22_prison)	C++20	65 / 100	8 ms	1196 KiB

prison

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

int kth(int x, int k) {
	k = 12-k;
	while (k--) x/=2;
	return x%2;
}

const int X = 24;

std::vector<std::vector<int>> devise_strategy(int N) {
	vector s(X+1, vector<int>(N+1));
	s[0][0] = 0;
	for (int i=1; i<=X; i++) {
		int b = i-1;
		b = (b - b%2) / 2;
		s[i][0] = 1 - b%2;
	}
	for (int i=1; i<=N; i++) s[0][i] = kth(i, 0) + 1;
	for (int i=1; i<=X; i++) for (int j=1; j<=N; j++) {
		int b = i-1;
		int r = b%2;
		b = (b-r) / 2;
		if (r < kth(j, b)) s[i][j] = -(1-s[i][0]+1);
		else if (r == kth(j, b)) s[i][j] = 2*(b+1) + kth(j, b+1) + 1;
		else if (r > kth(j, b)) s[i][j] = -(s[i][0]+1);
		if (b == 11 && r == kth(j, b)) {
			if (kth(j, b+1) == 0) s[i][j] = -(s[i][0]+1);
			else s[i][j] = -(1-s[i][0]+1);
		} 
	}
	return s;
	// cout << "\t";
	// for (int i=0; i<=N; i++) cout << i << "\t";
	// cout << "\n";
	// for (int i=0; i<=X; i++) {
	// 	cout << i << "\t";
	// 	for (int j=0; j<=N; j++) cout << s[i][j] << "\t";
	// 	cout << "\n";
	// }
	return s;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 55 / 90