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JARAM2021
Algorithm_Beginner
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Boore-Moore.cpp
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Boore-Moore.cpp
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#include <stdio.h>
#include <string.h>
#include <limits.h>
#pragma warning(disable:4996)
int bm_match(const char txt[], const char pat[])
{
int pt; // txt 커서
int pp; // pat 커서
int txt_len = strlen(txt); // txt 문자 개수
int pat_len = strlen(pat); // pat 문자 개수
int skip[UCHAR_MAX + 1]; // 건너뛰기 표
for (pt = 0; pt <= UCHAR_MAX; ++pt) // 건너뛰기 표 만들기
skip[pt] = pat_len;
for (pt = 0; pt < pat_len - 1; ++pt)
{
skip[pat[pt]] = pat_len - pt - 1;
}
while (pt < txt_len)
{
pp = pat_len - 1; // pat의 마지막 문자부터 검사
while (txt[pt] == pat[pp])
{
if (pp == 0)
return pt;
--pp;
--pt;
}
pt += (skip[txt[pt]] > pat_len - pp) ? skip[txt[pt]] : pat_len - pp;
}
return -1;
}
int main()
{
int idx;
char s1[256];
char s2[256];
puts("Boyer-Moore 법");
printf("텍스트: ");
scanf("%s", s1);
printf("패턴: ");
scanf("%s", s2);
idx = bm_match(s1, s2); // 문자열 s1에서 문자열 s2를 Boyer-Moore법을 사용해 검색
if (idx == -1)
puts("텍스트에 패턴이 없습니다.");
else
printf("%d번째 문자부터 match합니다.\n", idx + 1);
return 0;
}
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