Submission #1234150

#	Time	Username	Problem	Language	Result	Execution time	Memory
1234150		Zbyszek99	Crayfish scrivener (IOI12_scrivener)	C++20	0 / 100	232 ms	174852 KiB

scrivener

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define ld long double
#define ull unsigned long long
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<long long, long long>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define rep(i, b) for(int i = 0; i < (b); ++i)
#define rep2(i,a,b) for(int i = a; i <= (b); ++i)
#define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c)
#define count_bits(x) __builtin_popcountll((x))
#define all(x) (x).begin(),(x).end()
#define siz(x) (int)(x).size()
#define forall(it,x) for(auto& it:(x))
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;
//mt19937 mt;void random_start(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());}
//ll los(ll a, ll b) {return a + (mt() % (b-a+1));}
const int INF = 1e9+50;
const ll INF_L = 1e18+40;
const ll MOD = 1e9+7;

const int maxn = 2e7+100;

const int tree_siz = 1024*2048-1;

int left_[maxn];
int right_[maxn];
char val[maxn];
vi sizes;
vi roots;
int cur_node = 0;

char get_val(int akt, int p1, int p2, int poz)
{
    if(p1 == p2) return val[akt];
    if(poz <= (p1+p2)/2)
    {
        return get_val(left_[akt],p1,(p1+p2)/2,poz);
    }
    return get_val(right_[akt],(p1+p2)/2+1,p2,poz);
}

void add(int akt, int p1, int p2, int poz, char z, int prev)
{
    if(p1 == p2)
    {
        val[akt] = z;
        return;
    } 
    if((p1+p2)/2 >= poz)
    {
        if(prev != -1) right_[akt] = right_[prev];
        left_[akt] = cur_node++;
        add(left_[akt],p1,(p1+p2)/2,poz,z,(prev != -1 ? left_[prev] : -1));
    }
    else
    {
        if(prev != -1) left_[akt] = left_[akt];
        right_[akt] = cur_node++;
        add(right_[akt],(p1+p2)/2+1,p2,poz,z,(prev != -1 ? right_[prev] : -1));
    }
}

void Init() 
{
    rep(i,maxn)
    {
        left_[i] = -1;
        right_[i] = -1;
    }
    sizes = {0};
    roots = {0};
    cur_node++;
}

void TypeLetter(char L) 
{
    int root = cur_node++;
    add(root,0,tree_siz/2,sizes.back(),L,roots.back());
    sizes.pb(sizes.back()+1);
    roots.emplace_back(root);
}

void UndoCommands(int U) 
{
    roots.pb(roots[siz(roots)-1-U]);
    sizes.pb(sizes[siz(sizes)-1-U]);
}

char GetLetter(int P) 
{
    return get_val(roots.back(),0,tree_siz/2,P);
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 22
• Subtask 4: 0 / 26
• Subtask 5: 0 / 40