Submission #658499

#	Time	Username	Problem	Language	Result	Execution time	Memory
658499		YassineBenYounes	Prisoner Challenge (IOI22_prison)	C++17	48.50 / 100	32 ms	1364 KiB

prison

/*
ID: Yassine BenYounes
TASK: hoofball
LANG: C++                 
*/
#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
/*#define pbds                                               \
    tree<pair<int, int>, null_type, less<pair<int, int> >, \
         rb_tree_tag, tree_order_statistics_node_update>
using namespace __gnu_pbds;*/
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef double db;
ll gcd(ll a , ll b) {return b ? gcd(b , a % b) : a ;} // greatest common divisor (PGCD)
ll lcm(ll a , ll b) {return (a * b) / gcd(a , b);} // least common multiple (PPCM)
ll modd(ll x, ll n){while(x < 0){x += n;}return (x % n);} // modulo for negative numbers
int dx[4] = {1, -1, 0, 0 };
int dy[4] = {0, 0, 1, -1};
#define endl "\n"
#define ss second
#define ff first
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define vi vector<int>
#define vii vector<pair<int,int>>
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pdd  pair<double,double>
#define vdd  vector<pdd>
#define speed ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
 
void init(){
    #ifndef ONLINE_JUDGE
 
freopen("input.txt", "r", stdin);
 
freopen("output.txt", "w", stdout);
 
#endif // ONLINE_JUDGE
}
 
const int mx = 1e5 + 9;
const ll mod = 1e9+7;
const int inf = 1e9;

int find_bit(int target, int k){
    vi v;
    while(target > 0){
        int x = target;
        target = target / 3;
        v.pb(x % 3);
    }
    reverse(all(v));
    while(v.size() < 8){
        v.insert(v.begin(), 0);
    }
    return v[k];
}

vi identify(int n){
    if(n >= 25){
        return {n - 24, 0, 1};
    }
    int bit = (n - 1) % 3;
    int tartib = (n-1) / 3;
    return {tartib, bit, 0};
}

int transform(int tartib, int bit, int player){
    if(player == 1){
        return 24 + tartib;
    }
    int x = tartib * 3 + bit + 1;
    return x;
}

int n;

std::vector<std::vector<int>> devise_strategy(int N){
    vector<vi> v(32, vi(N+1)); 
    n = N;
    v[0][0] = 0;
    for(int j = 1; j <= N;j++){
        int tartib = 0;
        int bit = find_bit(j, tartib);
        int player = 0;
        int number = transform(tartib, bit, player);

        v[0][j] = number;
    }
    for(int i = 1; i <= 31;i++){
        vi vec = identify(i);
        int tartib = vec[0];
        int bit = vec[1];
        int player = vec[2];
        if(player == 0){
            v[i][0] = 1;
            for(int j = 1;j <= N;j++){
                int x = find_bit(j, tartib);
                if(x < bit){
                    v[i][j] = -2;
                }
                else if(bit < x){
                    v[i][j] = -1;
                }
                else{
                    int number = transform(tartib+1, x, 1);
                    if(tartib == 7)continue;
                    //cout << tartib << " " << bit << " " << player << " : " << number << endl;
                    v[i][j] = number;
                }
            }        
        }
        else{
            v[i][0] = 0;
            //cout << tartib+1 << endl;
            for(int j = 1;j <= N;j++){
                int x = find_bit(j, tartib);
                int number = transform(tartib, x, 0);
                v[i][j] = number;
            }
        }
    }
    return v;
}
/*
int main(){
    init();
    speed;
    vector<vi> v = devise_strategy(3);
    for(int i = 0; i <= 31;i++){
        for(int j = 0;j <= n;j++){
            cout << v[i][j] << " ";
        }
        cout << endl;
    }
    //tartib, bit, player
   // cout << transform(1, 0, 1) << endl;
    
    vi vec = identify(31);
    int tartib = vec[0];
    int bit = vec[1];
    int player = vec[2];
    for(int x : vec){
        cout << x << endl;
    }
    //cout << find_bit(1, 7) << endl;
}*/

Compilation message (stderr)

prison.cpp: In function 'void init()':
prison.cpp:41:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 | freopen("input.txt", "r", stdin);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
prison.cpp:43:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 | freopen("output.txt", "w", stdout);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 38.5 / 90