Submission #632276

#	Time	Username	Problem	Language	Result	Execution time	Memory
632276		Cauchico	Prisoner Challenge (IOI22_prison)	C++17	80 / 100	11 ms	1156 KiB

prison

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

vector<vector<int>> devise_strategy(int n) {
  if (n==2) {
    vector<vector<int>> ans = {{0,-1,-2},{1,-2,-1}};
    return ans;
  }
  int x = 3 * ceil(log2(n)/(float(log2(3)))) - 2; //cout << x << "\n";
  vector<vector<int>> ans(x+1,vector<int>(n+1));
  vector<int> p3 = {1};
  while (p3.back() < n) {
    p3.push_back(3*p3.back());
  }

  int bggest = 0;
  int cp = n;
  while (cp>0) {
    bggest++;
    cp/=3;
  }
  vector<vector<int>> b3(n+1,vector<int>(bggest));
  for (int i=0;i<=n;i++) {
    int j = 0,k=i;
    while (k>0) {
      b3[i][j] = k%3;
      k/=3; j++;
    }
    reverse(b3[i].begin(),b3[i].end());
  }

  ans[0][0] = 0;
  for (int j=1;j<=n;j++) {
    ans[0][j] = 1 + b3[j][0];
  }

  for (int i=1;i<=x;i++) {
    int step = ceil(i/3.00);
    if (step%2 == 0) {
      ans[i][0] = 0;
    } else {
      ans[i][0] = 1;
    }

    for (int j=1;j<=n;j++) {
      if (i==x) {
        if (b3[j][step-1] == 0) {
          if (step%2==0) {
            ans[i][j] = -1;
          } else {
            ans[i][j] = -2;
          }
        } else {
          if (step%2==0) {
            ans[i][j] = -2;
          } else {
            ans[i][j] = -1;
          }
        }
      } else if (b3[j][step-1] == (i-1)%3) {
        int value = 3*step + b3[j][step]+1;
        if (value == x) {
          if (step%2==0) {
            ans[i][j] = -1;
          } else {
            ans[i][j] = -2;
          }
        } else if (value == x+2){
          if (step%2==0) {
            ans[i][j] = -2;
          } else {
            ans[i][j] = -1;
          }
        } else if (value==x+1) {
          ans[i][j] = x;  
        } else {
          ans[i][j] = value;
        }
      } else {
        if (b3[j][step-1] < (i-1)%3) {
          if (step%2==0) {
            ans[i][j] = -1;
          } else {
            ans[i][j] = -2;
          }
        } else {
          if (step%2==0) {
            ans[i][j] = -2;
          } else {
            ans[i][j] = -1;
          }
        }
      }
    }
  }
  return ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 70 / 90