Dynamic Programming, Recursion, Competitive Programming, Leetcode, 3sum.
function call, we lookup from the precomputed dictionary matching_two_sums = two_sums.get(sum - arr[-1], []) # This is to prevent using the same number twice filtered_two_sums = list(filter(lambda t: t[0] != arr[-1] and t[1] != arr[-1], matching_two_sums)) c2 = list(map(lambda t: (t[0], t[1],