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hdu 3407 String-Matching Automata dfa

//题意：给一段字符串，由状态转换图画出状态转换表

  1 #include "bits/stdc++.h"
  2 using namespace std;
  3 char str[10010];
  4 struct DfaNode {
  5     char ch;
  6     int son, next, father, suffix;
  7     bool danger;
  8 } dfaNode[10010];
  9 int cntDfaNode;
 10 
 11 void BuildTree(char *s, int len, int pos, int index)
 12 {
 13     if(dfaNode[index].son == 0) {
 14         ++cntDfaNode;
 15         dfaNode[index].son = cntDfaNode;
 16         dfaNode[cntDfaNode].father = index;
 17         dfaNode[cntDfaNode].ch = s[pos];
 18         if(pos + 1 == len)
 19             dfaNode[cntDfaNode].danger = 1;
 20         else
 21             BuildTree(s, len, pos + 1, cntDfaNode);
 22     } else {
 23         for(index = dfaNode[index].son; index && dfaNode[index].ch != s[pos]; index = dfaNode[index].next);
 24         if(dfaNode[index].ch == s[pos] && pos + 1 == len)
 25             dfaNode[index].danger = 1;
 26         else if(dfaNode[index].ch == s[pos])
 27             BuildTree(s, len, pos + 1, index);
 28         else {
 29             ++cntDfaNode;
 30             dfaNode[index].son = cntDfaNode;
 31             dfaNode[cntDfaNode].father = index;
 32             dfaNode[cntDfaNode].ch = s[pos];
 33             if(pos + 1 == len)
 34                 dfaNode[cntDfaNode].danger = 1;
 35             else
 36                 BuildTree(s, len, pos + 1, cntDfaNode);
 37         }
 38     }
 39 }
 40 
 41 int q[10010];
 42 void BuildDfa()
 43 {
 44     int child(int x, char ch);
 45     int index, l, r;
 46     l = r = 1;
 47     q[1] = 1;
 48     dfaNode[1].suffix = 1;
 49     while(l <= r) {
 50         if(dfaNode[l].danger == 0) {
 51             for(index = dfaNode[l].son; index; index = dfaNode[index].next) {
 52                 ++r;
 53                 q[r] = index;
 54             }
 55         }
 56         ++l;
 57     }
 58     int i;
 59     for(i = 2; i <= r; ++i) {
 60         if(dfaNode[q[i]].father == 1) {
 61             dfaNode[q[i]].suffix = 1;
 62             continue;
 63         }
 64         dfaNode[q[i]].suffix = child(dfaNode[dfaNode[q[i]].father].suffix, dfaNode[q[i]].ch);
 65         if(dfaNode[dfaNode[q[i]].suffix].danger)
 66             dfaNode[q[i]].danger = 1;
 67     }
 68 }
 69 
 70 int res[10010][30];
 71 
 72 int child(int index, char ch)
 73 {
 74     int sonIndex;
 75     for(sonIndex = dfaNode[index].son; sonIndex && dfaNode[sonIndex].ch != ch; sonIndex = dfaNode[sonIndex].next);
 76     if(sonIndex)
 77         return sonIndex;
 78     else if(index == 1)
 79         return 1;
 80     else
 81         return child(dfaNode[index].suffix, ch);
 82 }
 83 
 84 int main()
 85 {
 86     while(scanf("%s", str), strcmp(str, "0")) {
 87         memset(dfaNode, 0, sizeof(dfaNode));
 88         memset(res, 0, sizeof(res));
 89         cntDfaNode = 1;
 90         //建树，建dfa
 91         BuildTree(str, strlen(str), 0, 1);
 92         BuildDfa();
 93         //遍历str
 94         int index, sonIndex, i;
 95         for(i = 0, index = 1; i <= strlen(str); index = child(index, str[i]), ++i) {
 96             char c;
 97             for(c = 'a'; c <= 'z'; ++c) {
 98                 res[index - 1][c - 'a'] = child(index, c) - 1;
 99             }
100         }
101         for(i = 0; i <= strlen(str); ++i) {
102             printf("%d", i);
103             for(int j = 0; j < 26; ++j) {
104                 printf(" %d", res[i][j]);
105             }
106             puts("");
107         }
108     }
109 }

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原文地址：https://www.cnblogs.com/AC-Phoenix/p/4425933.html