Submission #1078792

#	Time	Username	Problem	Language	Result	Execution time	Memory
1078792		LittleOrange	Prisoner Challenge (IOI22_prison)	C++17	65 / 100	17 ms	1220 KiB

prison

#include "prison.h"

#include <vector>
#include<bits/stdc++.h>
using namespace std;
using ll = int;
const ll m = 3;
ll g(ll x, ll lv){
  //cerr << "g " << x << " " << lv;
  while(lv-->0) x/=m;
  //cerr << " = " << x%m << "\n";
  return x%m;
}
ll cal(ll x){
  ll r = -1;
  while(x){
    r++;
    x/=m;
  }
  return r;
}
std::vector<std::vector<int>> devise_strategy(int N) {
  ll n = N;
  ll lvl = cal(n);
  vector<vector<ll>> ret;
  vector<ll> mp;
  {
    vector<ll> a(n+1,0);
    for(ll i = 1;i<=n;i++) a[i] = g(i,lvl)+1;
    ret.push_back(a);
  }
  for(ll j = 0;j<=lvl;j++){
    ll h = lvl-j;
    ll tp = j&1^1;
    for(ll x = 0;x<m;x++){
      vector<ll> a(n+1,tp);
      for(ll i = 1;i<=n;i++){
        ll v = g(i,h);
        if (v<x) a[i] = -1-tp;
        else if (v>x) a[i] = -2+tp;
        else a[i] = g(i,h-1)+(j+1)*m+1;
      }
      ret.push_back(a);
    }
  }
  //ofstream stra("str.txt");
  //stra << ret.size() << "\n";
  ll x = ret.size()-1;
  for(auto &o : ret){
    for(ll &i : o){
      if (i<-2||i>x) i = x;
    }
    //for(ll i = 0;i<=n;i++) stra << o[i] << " \n"[i==n];
  }
  return ret;
}

Compilation message (stderr)

prison.cpp: In function 'std::vector<std::vector<int> > devise_strategy(int)':
prison.cpp:34:14: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
   34 |     ll tp = j&1^1;
      |             ~^~

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