字典树 之 poj 1056

//  [7/5/2014 Sjm]
/*
字典树，找前缀。具体求解思路同：字典树 之 hdu 1671 poj 3630
*/
#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <cstring>
using namespace std;
const int MAX = 2;

struct Trie{
	bool Judge;
	Trie* next[2];
	Trie(){
		Judge = false;
		memset(next, NULL, sizeof(next));
	}
};

Trie* Root;

bool Cre_Sea_Trie(char* str){
	int Jdg1 = true, Jdg2 = false;
	int len = strlen(str);
	Trie* p = Root;
	for (int i = 0; i < len; i++) {
		int pos = str[i] - '0';
		if (!(p->next[pos])) {
			p->next[pos] = new Trie;
			Jdg1 = false;
		}
		else {
			if (p->next[pos]->Judge) {
				Jdg2 = true;
				break;
			}
		}
		p = p->next[pos];
	}
	p->Judge = true;
	return (Jdg1 || Jdg2);
}

void DelTrie(Trie* T) {
	for (int i = 0; i < MAX; i++) {
		if (T->next[i]) {
			DelTrie(T->next[i]);
		}
	}
	delete[] T;
}

int main()
{
	//freopen("input.txt", "r", stdin);
	char str[10][15];
	int num = 0, mycount = 0;
	while (~scanf("%s", str[num])) {
		if (strcmp(str[num], "9") == 0) {
			Root = new Trie;
			mycount++;
			int i;
			for (i = 0; i < num; i++) {
				if (Cre_Sea_Trie(str[i])) {
					printf("Set %d is not immediately decodable
", mycount);
					break;
				}
			}
			if (i == num) {
				printf("Set %d is immediately decodable
", mycount);
			}
			DelTrie(Root);
			num = 0;
			continue;
		}
		num++;
	}
	return 0;
}