题目链接:http://acm.hdu.edu.cn/showproblem.php?
pid=1251
题意:先给出字典。每次查询一个单词,求以该单词为前缀的个数。
思路:裸字典树
代码
#include <iostream> #include <stdio.h> #include <string.h> #include <math.h> #include <algorithm> #include <string> using namespace std; #define lson l, m, rt << 1 #define rson m + 1, r, rt << 1 | 1 #define ceil(x, y) (((x) + (y) - 1) / (y)) const int SIZE = 30; const int N = 1e6 + 10; const int INF = 0x7f7f7f7f; struct Trie { int val[SIZE]; int count;//以从根结点到当前结点的字符串为前缀的单词个数 }; int sz; Trie ch[N]; int newnode() { memset(ch[sz].val, 0, sizeof(ch[sz].val)); ch[sz].count = 0; return sz++; } void insert(char *s) { int u = 0; for (int i = 0; s[i] != '