【POJ】2418 Hardwood Species

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簡單字典樹。

 1 #include <cstdio> 2 #include <cstring> 3 #include <cstdlib> 4  5 #define MAXN 128 6  7 typedef struct Trie { 8     int count; 9     Trie *next[MAXN];10     Trie() {11         count = 0;12         for (int i=0; i<MAXN; ++i)13             next[i] = NULL;14     }15 } Trie;16 17 Trie root;18 char buf[35];19 double n = 0;20 21 void create(char str[]) {22     int i = 0, id;23     Trie *p = &root, *q;24 25     while (str[i]) {26         id = str[i];27         ++i;28         if (p->next[id] == NULL) {29             q = new Trie();30             p->next[id] = q;31         }32         p = p->next[id];33     }34     p->count++;35 }36 37 void dfs(Trie *t, int d) {38     int i;39 40     if (t->count) {41         buf[d] = ‘\0‘;42         printf("%s %.4lf\n", buf, t->count*100.0/n);43     }44     for (i=0; i<MAXN; ++i) {45         if (t->next[i]) {46             buf[d] = i;47             dfs(t->next[i], d+1);48         }49     }50 }51 52 int main() {53     while (gets(buf) != NULL) {54         create(buf);55         n += 1.0;56     }57     dfs(&root, 0);58     return 0;59 }