【POJ】1816 Wild Words

DFS+字典树。题目数据很BT。注意控制DFS深度小于等于len。当‘\0‘时，还需判断末尾*。另外，当遇到*时，注意讨论情况。

  1 #include <iostream>
  2 #include <cstdio>
  3 #include <cstring>
  4 #include <cstdlib>
  5 #include <vector>
  6 #include <algorithm>
  7 using namespace std;
  8
  9 #define TRIEN 28
 10
 11 typedef struct Trie {
 12     vector<int> vc;
 13     Trie *next[TRIEN];
 14     Trie() {
 15         for (int i=0; i<TRIEN; ++i)
 16             next[i] = NULL;
 17     }
 18 } Trie;
 19
 20 Trie root;
 21 char buf[25];
 22 int nums[100005], nn, len;
 23
 24 void create(char str[], int in) {
 25     int i = 0, id;
 26     Trie *p = &root, *q;
 27
 28     while (str[i]) {
 29         if (str[i] == ‘?‘)
 30             id = 26;
 31         else if (str[i] == ‘*‘)
 32             id = 27;
 33         else
 34             id = str[i] - ‘a‘;
 35         ++i;
 36         if (p->next[id] == NULL) {
 37             q = new Trie();
 38             p->next[id] = q;
 39         }
 40         p = p->next[id];
 41     }
 42     p->vc.push_back(in);
 43 }
 44
 45 void find(Trie *p, int d, int f) {
 46     int id;
 47     if (d > len)
 48         return ;
 49     if (buf[d] == ‘\0‘) {
 50         int vcn = p->vc.size();
 51         int i;
 52         if (vcn) {
 53             for (i=0; i<vcn; ++i)
 54                 nums[nn++] = p->vc[i];
 55         }
 56         if (p->next[27])
 57             find(p->next[27], d, 0);
 58         return ;
 59     }
 60
 61     id = buf[d] - ‘a‘;
 62     if (p->next[id])
 63         find(p->next[id], d+1, 0);
 64     if (p->next[26])
 65         find(p->next[26], d+1, 0);
 66     if (p->next[27]) {
 67         find(p->next[27], d+1, 1);
 68         find(p->next[27], d, 1);
 69     }
 70     if (f)
 71         find(p, d+1, 1);
 72 }
 73
 74 int main() {
 75     int n, m, i;
 76
 77     scanf("%d %d", &n, &m);
 78
 79     for (i=0; i<n; ++i) {
 80         scanf("%s", buf);
 81         create(buf, i);
 82     }
 83
 84     while (m--) {
 85         scanf("%s", buf);
 86         nn = 0;
 87         len = strlen(buf);
 88         find(&root, 0, 0);
 89         if (!nn) {
 90             printf("Not match\n");
 91             continue;
 92         }
 93         sort(nums, nums+nn);
 94         printf("%d", nums[0]);
 95         for (i=1; i<nn; ++i)
 96             if (nums[i] != nums[i-1])
 97                 printf(" %d", nums[i]);
 98         printf("\n");
 99     }
100
101     return 0;
102 }

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