Submission #1023115

#	Time	Username	Problem	Language	Result	Execution time	Memory
1023115		vjudge1	Prisoner Challenge (IOI22_prison)	C++17	56 / 100	10 ms	1116 KiB

prison

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

std::vector<std::vector<int>> devise_strategy(int N){
	vector<vector<int>> s(27, vector<int>(N + 1, 0));

	for(int x = 0; x < s.size(); x++){
		if(!x){
			s[x][0] = 0;
			for(int i = 1; i <= N; i++){
				s[x][i] = 25;
				if(i & (1<<12)) s[x][i]++;
			}
		} else{
			int k = (x - 1) / 2;
			s[x][0] = 1 - (k & 1);
			for(int i = 1; i <= N; i++){
				bool c = 0;
				if(i & (1<<k)) c = 1;
				if(((x - 1) & 1) < c){
					s[x][i] = - (s[x][0] ^ 1) - 1;
				}
				else if(((x - 1) & 1) > c){
					s[x][i] = - s[x][0] - 1;
				}
				else{
					s[x][i] = (k - 1) * 2 + 1;
					if(i & (1<<(k-1))) s[x][i]++;
					// cout << x << ' ' << k << ' ' << i << ' ' << bool(i & (1<<(k-1))) << s[x][i] << endl;
				}
			}
		}
		// cout << x << ' ' << s[x][0] << endl;
	}
	return s;
}

Compilation message (stderr)

prison.cpp: In function 'std::vector<std::vector<int> > devise_strategy(int)':
prison.cpp:7:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |  for(int x = 0; x < s.size(); x++){
      |                 ~~^~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 46 / 90