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Wow, that took a while. "The ratio of any two consecutive terms in a geometric progression is the same".
def countTriplets(arr, r): ntuples = 0 div_r = defaultdict(lambda: 0) r_val = defaultdict(lambda: 0) for v in arr: ntuples += div_r[v/r] div_r[v] += r_val[v/r] r_val[v] += 1 return ntuples
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Count Triplets
You are viewing a single comment's thread. Return to all comments →
Wow, that took a while. "The ratio of any two consecutive terms in a geometric progression is the same".