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kse-02/instrumented/rabin_karp.py

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2023-11-13 15:33:20 +00:00
def rabin_karp_search_instrumented(pat: str, txt: str) -> list:
2023-11-13 15:33:20 +00:00
assert (len(pat) <= len(txt))
d = 2560
q = 101
M = len(pat)
N = len(txt)
i = 0
j = 0
p = 0
t = 0
h = 1
for i in range((M - 1)):
h = ((h * d) % q)
for i in range(M):
p = (((d * p) + ord(pat[i])) % q)
t = (((d * t) + ord(txt[i])) % q)
found_at_index = []
for i in range(((N - M) + 1)):
if evaluate_condition(1, 'Eq', p, t):
for j in range(M):
if evaluate_condition(2, 'NotEq', txt[(i + j)], pat[j]):
break
j += 1
if evaluate_condition(3, 'Eq', j, M):
found_at_index.append(i)
if evaluate_condition(4, 'Lt', i, (N - M)):
t = (((d * (t - (ord(txt[i]) * h))) + ord(txt[(i + M)])) % q)
if evaluate_condition(5, 'Lt', t, 0):
t = (t + q)
return found_at_index