Submission #1234222

#	Time	Username	Problem	Language	Result	Execution time	Memory
1234222		dosts	Prisoner Challenge (IOI22_prison)	C++20	0 / 100	3 ms	584 KiB

prison

#include "prison.h"
#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
//#define int long long
#define pii pair<int,int>
#define vi vector<int>
#define ff first
#define ss second
#define sp << " " <<
#define all(x) x.begin(),x.end()
#define big(x) ((int)(x.size()))
using namespace std;
const int MOD = 1e9+7, LIM = 1e6+1, inf = 2e9;

int bit(int x,int b) {
  while (b--) x/=3;
  return x%3;
}
std::vector<std::vector<int>> devise_strategy(int N) {
  const int x = 22;
  vector<vi> ans(x+1,vi(N+1,0));
  ans[0][0] =  1;
  for (int j = 1;j<=N;j++) ans[0][j] = 3*7+bit(j,7)-1;
  for (int i=x;i>=2;i--) {
    int idx = (i+1)/3;
    int v = (i+1)%3;
    ans[i][0] = 1-idx%2;
    for (int j = 1;j<=N;j++) {
      if (bit(j,idx) != v) {
        if (bit(j,idx) < v) {
          if (idx%2) ans[i][j] = -1;
          else ans[i][j] = -2;
        }
        else {
          if (idx%2) ans[i][j] = -2;
          else ans[i][j] = -1;
        }
      }
      else {
        if (idx) {
          if (idx == 1) {
            int vv = bit(j,idx-1);
            if (vv == 0) {
              if (idx%2) ans[i][j] = -1;
              else ans[i][j] = -2;
            }
            else if (vv == 2) {
              if (idx%2) ans[i][j] = -2;
              else ans[i][j] = -1;
            }
            else ans[i][j] = 1;
          }
          else {
            ans[i][j] = 3*(idx-1)+bit(j,idx-1)-1;
          }
        }
        else ans[i][j] = 0;
      }
    }
  }
  for (int j=1;j<=N;j++) {
    int v = bit(j,0);
    int idx = 0;
    if (v > 1) ans[1][j] = -2;
    else ans[1][j] = -1;
  }
  return ans;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 90