Submission #1077235

#	Time	Username	Problem	Language	Result	Execution time	Memory
1077235		pcc	Prisoner Challenge (IOI22_prison)	C++17	36.50 / 100	447 ms	3536 KiB

prison

#include "prison.h"

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

std::vector<std::vector<int>> devise_strategy(int N) {
	int ans = 13*2*2;//nowbit,turn,bit of a
	vector<vector<int>> re(ans,vector<int>(N+1,-1));
	vector<int> all;
	for(int i = 0;i<ans;i++){
		int turn = ((i>>1)&1);
		int tar = 12-(i>>2);
		int bit = i&1;
		if(turn == 0)re[i][0] = 0;
		else re[i][0] = 1;
		for(int j = 1;j<=N;j++){
			if(turn == 0){
				re[i][j] = (i/4*4)|2|((j>>tar)&1);
			}
			else{
				if(bit != ((j>>tar)&1)){
					if((j>>tar)&1)re[i][j] = -1;
					else re[i][j] = -2;
				}
				else{
					re[i][j] = ((i/4+1)*4);
					if(re[i][j]>=ans)re[i][j] = -1;
				}
			}
		}
	}
	for(auto &i:re)for(auto &j:i)if(j>=0)all.push_back(j);
	all.push_back(0);
	sort(all.begin(),all.end());all.resize(unique(all.begin(),all.end())-all.begin());cerr<<"ALL: "<<all.size()<<endl;
	ans = all.size();
	vector<vector<int>> v(ans,vector<int>(N+1,-1));
	for(int i = 0;i<ans;i++){
		int p = all[i];
		v[i][0] = re[p][0];
		for(int j = 1;j<=N;j++){
			if(re[p][j]<0)v[i][j] = re[p][j];
			else v[i][j] = lower_bound(all.begin(),all.end(),re[p][j])-all.begin();
		}
	}
	for(int i = 0;i<ans;i++){
		cerr<<i<<":";for(auto &j:v[i])cerr<<j<<',';cerr<<endl;
	}
	cerr<<"INIT DONE!"<<endl;
	return v;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 26.5 / 90