Submission #76860

#TimeUsernameProblemLanguageResultExecution timeMemory
76860FiloSanzaCrayfish scrivener (IOI12_scrivener)C++14
34 / 100
1077 ms189720 KiB
#include <bits/stdc++.h> using namespace std; struct Node{ const int MAX_SIZE = 30; char val; int depth; Node* father; vector<Node*> figli; Node(char val, int depth) : val(val), depth(depth), father(nullptr){ figli.resize(MAX_SIZE, nullptr); } Node(char val, int depth, Node* N) : val(val), depth(depth), father(N){ figli.resize(MAX_SIZE, nullptr); } }; struct Trie{ Node *root = nullptr; vector<Node *> version; int curr = 0; //costruttore Trie(){ root = new Node('\0', -1); version.push_back(root); } //Devo aggiungere nell'ultima versione il carattere(New Node se non esiste) e aggiungere una versione void insert(char c){ int val = c - 'a'; //Non esiste, lo creo if(version[curr]->figli[val] == nullptr){ version[curr]->figli[val] = new Node(c, version[curr]->depth+1, version[curr]); } //aggiungo la nuova versione version.push_back(version[curr]->figli[val]); curr ++; } //Per tornare indietro di N versioni mi basta andare all'indice curr - k del vettore void goBack(int k){ version.push_back(version[curr-k]); curr++; } char getKth(int k){ Node* node = version[curr]; while(node->depth != k){ node = node->father; } return node->val; } }; Trie t; void Init() {} void TypeLetter(char L) { t.insert(L); } void UndoCommands(int U) { t.goBack(U); } char GetLetter(int P) { return t.getKth(P); }
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