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September 14, 2018 12:36
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BooyerMoore
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| def boyermoore(p, t): | |
| m = len(p) | |
| n = len(t) | |
| if m > n: return -1 | |
| pulo = [m for k in range(256)] | |
| for k in range(m - 1): | |
| pulo[ord(p[k])] = m - k - 1 | |
| pulo = tuple(pulo) | |
| k = m - 1 | |
| while k < n: | |
| j = m - 1 | |
| i = k | |
| while j >= 0 and t[i] == p[j]: | |
| j -= 1 | |
| i -= 1 | |
| if j == -1: return i + 1 | |
| k += pulo[ord(t[k])] | |
| return -1 | |
| texto = 'os algoritmos de ordenação' | |
| palavra = 'algoritmo' | |
| print (boyermoore(palavra, texto)) |
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