제출 #713480

#제출 시각아이디문제언어결과실행 시간메모리
713480hkoiCrayfish scrivener (IOI12_scrivener)C++17
0 / 100
305 ms55392 KiB
#include <bits/stdc++.h>
using namespace std;
const int mxN = 1000005;
char s[mxN];
int bin[20][mxN], depth[mxN], it = 1;
vector<int> tail = {0};
void Init() {
    
}
void TypeLetter(char c) {
    s[++it] = c;
    depth[it] = depth[tail.back()] + 1;
    bin[0][it] = tail.back();
    for (int i = 1; i < 20; i++) {
        bin[i][it] = bin[i-1][bin[i-1][it]];
    }
    tail.push_back(it);
}
void UndoCommands(int k) {
    tail.push_back(tail[tail.size()-k-1]);
}
char GetLetter(int k) {
    int ret = tail.back();
    for (int i = 0; i < 20; i++) {
        if ((1 << i) & depth[tail.back()-k-1]) ret = bin[i][ret];
    }
    return ret;
}
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