Submission #1076975

#	Time	Username	Problem	Language	Result	Execution time	Memory
1076975		Lalic	Prisoner Challenge (IOI22_prison)	C++17	56 / 100	10 ms	1372 KiB

prison

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

#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(), x.end()
#define allr(x) x.rbegin(), x.rend()
#define mp make_pair

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef complex<double> cd;

vector<vector<int>> devise_strategy(int N) {
	vector<vector<int>> ans(27, vector<int>(N+1));
	
	vector<int> pot(9);
	pot[0]=1;
	for(int i=1;i<=8;i++) pot[i]=3*pot[i-1];
	
	for(int i=0;i<=26;i++){
		if((i%9)&1) ans[i][0]=1;
		else ans[i][0]=0;
		
		int val=i/9, p=7-(i%9);
		
		for(int j=1;j<=N;j++){
			int curr=(j/pot[p+1])%3;
			
			if(curr<val){
				if((i%9)&1) ans[i][j]=-2;
				else ans[i][j]=-1;
				
				continue;
			}
			else if(curr>val){
				if((i%9)&1) ans[i][j]=-1;
				else ans[i][j]=-2;
				
				continue;
			}
			
			if(p>=0) ans[i][j]=(7-p+1)+9*((j/pot[p])%3);
			else ans[i][j]=1;
		}
	}
	
	//~ for(int i=0;i<=23;i++)
		//~ for(int j=0;j<=N;j++)
			//~ cout << i << " " << j << " -> " << ans[i][j] << "\n";
	
	return ans;
}

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