Submission #1056442

#	Time	Username	Problem	Language	Result	Execution time	Memory
1056442		mychecksedad	Prisoner Challenge (IOI22_prison)	C++17	72 / 100	13 ms	1116 KiB

prison

#include "prison.h"
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define all(x) x.begin(),x.end()
#define ll long long int
#define en cout << '\n'
#define pi pair<int,int>
#define vi vector<int> 
#define ff first
#define ss second

int t[8]={
  1,
  3,
  9,
  27,
  81,
  243,
  729,
  2187
};

int get(int num, int div){
  if(div == -1) return 0;
  for(int i = 7; i > div; --i){
    while(num >= t[i]) num -= t[i];
  }
  return num / t[div];
}

std::vector<std::vector<int>> devise_strategy(int n) {
  vector<vector<int>> ans(24, vector<int>(n+1, 0));
  // cout << get(2, 1) << ' ';
  ans[0][0] = 0;
  for(int i = 1; i <= n; ++i){
    ans[0][i] = get(i, 7) + 1;
  }
  int tot = 8;
  for(int i = 1; i <= 23; ++i){
    int bit = tot-(i+2)/3;
    // cout << bit << ' ';
    int cur;
    if(bit % 2 == 0){
      ans[i][0] = 0;
      cur = 1;
    }else{
      ans[i][0] = 1;
      cur = 2;
    }

    // int nx = (1<<(bit-1));
    int ii = (i%3==0 ? i + 1 : (i % 3 == 1 ? i + 3 : i + 2));
    int x = i%3 == 0 ? 2 : (i % 3 == 1 ? 0 : 1);

    // cout << i << ' ' << ii << '\n';
    for(int j = 1; j <= n; ++j){
      int xx = get(j, bit);
      if(xx == 0){
        if(x > 0){
          ans[i][j] = -cur;
        }else{
          int nxt = get(j, bit - 1);
          ans[i][j] = ii + nxt;
        }
      }else if(xx == 1){
        if(x < 1){
          ans[i][j] = -(3-cur);
        }else if(x > 1){
          ans[i][j] = -cur;
        }else{
          int nxt = get(j, bit - 1);
          ans[i][j] = ii + nxt;
        }
      }else{
        if(x < 2){
          ans[i][j] = -(3-cur);
        }else{
          int nxt = get(j, bit - 1);
          ans[i][j] = ii + nxt;
        }
      }
      if(ans[i][j] >= 24) ans[i][j] = -1;
    }
  }
  // for(int i = 0; i <= 24; ++i){
  //   for(int j = 0; j <= n; ++j) cout << ans[i][j] << ' ';
  //   en;
  // }

  // for(auto &v: ans){
  //   for(auto &u: v){
  //     if(u == 26) u = 1;
  //   }
  // }
  return ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 62 / 90