# Returns the improvement in (int) percent def get_improvement(y_val, x_val): return int(100 - (y_val / x_val * 100)) def answer(y, x): improvements = [] for _, y_val in enumerate(y): tmp = [] for _, x_val in enumerate(x): tmp.append(get_improvement(y_val, x_val)) improvements.append(tmp) return set.intersection(*map(set, improvements)).pop() # tests print answer([2.2999999999999998, 15.0, 102.40000000000001, 3486.8000000000002], [23.0, 150.0, 1024.0, 34868.0]) == 90 print answer([1.0], [1.0]) == 0
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