Submission #382337

#	Time	Username	Problem	Language	Result	Execution time	Memory
382337		ParsaAlizadeh	Crayfish scrivener (IOI12_scrivener)	C++17	100 / 100	593 ms	96952 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;

typedef long long       ll;
typedef pair<ll, ll>    pll;
typedef pair<int, int>  pii;

#define all(x)          x.begin(), x.end()
#define kill(x)         return cout << x << endl, 0
#define X               first
#define Y               second
//#define endl            '\n'

constexpr ll pw(ll a, ll b, ll mod) {
    return (!b    ? 1 :
            b & 1 ? a * pw(a * a % mod, b / 2, mod) % mod :
                    pw(a * a % mod, b / 2, mod));
}

constexpr int N   = 1e6 + 10;
constexpr int LOG = 21;

int cur, par[N], prv[N], sz[N], lg[N][LOG];
char C[N];
string ans;

void Init() {
    
}

void TypeLetter(char L) {
    cur++;
    C[cur] = L;
    par[cur] = cur - 1;
    prv[cur] = cur;
    sz[cur] = sz[par[cur]] + 1;

    lg[cur][0] = prv[par[cur]];
    for (int i = 1; i < LOG; i++)
        lg[cur][i] = lg[lg[cur][i - 1]][i - 1];
}

void UndoCommands(int U) {
    cur++;
    C[cur] = 'U';
    par[cur] = cur - U - 1;
    prv[cur] = prv[par[cur]];
    sz[cur] = sz[par[cur]];
}

char GetLetter(int P) {
    int tmp = prv[cur], cnt = sz[tmp] - P - 1;
    for (int i = LOG; i--; )
        if (cnt & (1 << i))
            tmp = lg[tmp][i];
    return C[tmp];
}

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