Submission #797452

#	Time	Username	Problem	Language	Result	Execution time	Memory
797452		penguinman	Prisoner Challenge (IOI22_prison)	C++17	65 / 100	10 ms	1108 KiB

prison

#include "prison.h"

#include <bits/stdc++.h>

using std::vector;
using std::string;
using std::cin;
using std::cout;
using ll = int;
using vi = vector<ll>;
using vii = vector<vi>;
using pii = std::pair<ll,ll>;
#define ln "\n"
#define rep(i,j,k) for(ll i=ll(j); i<ll(k); i++)
#define REP(i,j,k) for(ll i=ll(j); i<=ll(k); i++)
#define per(i,j,k) for(ll i=ll(j); i>=ll(k); i--)
#define all(a) a.begin(), a.end()
#define mp std::make_pair
#define pb emplace_back

std::vector<std::vector<int>> devise_strategy(int N) {
  constexpr ll log = 13;
  constexpr ll x = (log-1)*2;
  vii ret(x+1, vi(N+1));
  ret[0][0] = 1;
  REP(i,1,N){
    if(i & (1ll<<(log-1))) ret[0][i] = 1;
    else ret[0][i] = 2;
  }
  REP(i,1,x){
    ll now = x-i;
    ll bit = now/2+1;
    ret[i][0] = bit%2;
    REP(j,1,N){
      ll op = 0;
      if(j & (1ll<<bit)) op = 1;
      if(op != now%2){
        // op ... A
        if(bit%2 == 0){
          if(op) ret[i][j] = -2;
          else ret[i][j] = -1;
        }
        // op ... B
        else{
          if(op) ret[i][j] = -1;
          else ret[i][j] = -2;
        }
      }
      else{
        // op ... B
        if(bit == 1){
          if(j%2) ret[i][j] = -1;
          else ret[i][j] = -2;
        }
        else{
          ll nbit = bit-1;
          ll next = (nbit-1)*2;
          if(j & (1ll<<nbit)) next++;
          ret[i][j] = x-next;
        }
      }
    }
  }
  return ret;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 55 / 90