Submission #760713

#	Time	Username	Problem	Language	Result	Execution time	Memory
760713		fatemetmhr	Crayfish scrivener (IOI12_scrivener)	C++17	100 / 100	280 ms	87140 KiB

scrivener

//  ~ Be Name Khoda ~  //

#include <bits/stdc++.h>
//#pragma GCC optimize ("O3")
//#pragma GCC target("avx2")
//#pragma GCC optimize("unroll-loops,Ofast")

using namespace std;

typedef long long ll;

#define pb       push_back
#define mp       make_pair
#define all(x)   x.begin(), x.end()
#define fi       first
#define se       second

const int maxn  =  1e6   + 10;
const int maxn5 =  1e6   + 10;
const int maxnt =  1.2e6 + 10;
const int maxn3 =  1e3   + 10;
const int mod   =  1e9   + 7;
const int lg    =  20;
const ll  inf   =  1e18;

int cur, newnode = 1, pt = 0, st[maxn5];
int par[lg][maxn5], h[maxn5];
char op[maxn5], parchar[maxn5];


void Init(){
    cur = 0;
    memset(par, -1, sizeof par);
    h[0] = 0;
}

void TypeLetter(char l){

    //cout << "ok we are in " << l << ' ' << cur << ' ' << endl;

    op[pt] = l;
    int v = newnode++;
    par[0][v] = cur;
    h[v] = h[cur] + 1;
    for(int i = 1; i < lg && par[i - 1][v] != -1; i++)
        par[i][v] = par[i - 1][par[i - 1][v]];
    parchar[v] = l;
    cur = v;
    st[pt++] = cur;
    //cout << "now in " << cur << endl;
}

void UndoCommands(int t){
    //cout << "undo from " << cur << endl;
    op[pt++] = 'U';
    cur = st[pt - t - 2];
    st[pt - 1] = cur;
    //cout << "to " << t << ' ' << cur << ' ' << st[0] << endl;
}

char GetLetter(int pos){

    //cout << "while in " << cur << ' ' << pos << ' ' << h[cur] << endl;
    int d = h[cur] - pos - 1;
    int v = cur;
    for(int i = 0; i < lg; i++) if((d >> i)&1)
        v = par[i][v];
    return parchar[v];
}

/*
6
T a
T b
T d
U 2
U 1
P 2
*/

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