제출 #834753

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
834753		happypotato	크레이피쉬 글쓰는 기계 (IOI12_scrivener)	C++17	34 / 100	389 ms	262144 KiB

scrivener

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
struct Trie {
	char c;
	int len;
	Trie *lptr, *rptr;
	Trie(char cur = '.'): c(cur), len(0), lptr(nullptr), rptr(nullptr) {};
};
vector<Trie*> ver;
void Init() {
	Trie *cur = new Trie();
	function<void(Trie*, int)> build = [&](Trie *cur, int depth) {
		if (depth == -1) return;
		cur->lptr = new Trie(); build(cur->lptr, depth - 1);
		cur->rptr = new Trie(); build(cur->rptr, depth - 1);
	};
	build(cur, 19);
	ver.pb(cur);
}

void TypeLetter(char L) {
	Trie *cur = new Trie();
	Trie *prev = ver.back();
	ver.pb(cur);
	for (int i = 19; i >= 0; i--) {
		cur->len = prev->len;
		int tar = cur->len++;
		cur->lptr = prev->lptr;
		cur->rptr = prev->rptr;
		if (!bool(tar & (1 << i))) {
			prev = cur->lptr;
			cur->lptr = new Trie();
			cur = cur->lptr;
		} else {
			prev = cur->rptr;
			cur->rptr = new Trie();
			cur = cur->rptr;
		}
	}
	cur->c = L;
}

void UndoCommands(int U) {
	Trie *cur = new Trie();
	int ptr = (int)(ver.size()) - 1 - U;
	cur->lptr = ver[ptr]->lptr;
	cur->rptr = ver[ptr]->rptr;
	cur->len = ver[ptr]->len;
	ver.pb(cur);
}

char GetLetter(int P) {
	Trie *cur = ver.back();
	for (int i = 19; i >= 0; i--) {
		if (!bool(P & (1 << i))) {
			cur = cur->lptr;
		} else {
			cur = cur->rptr;
		}
	}
	return cur->c;
}

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