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题目： Given four lists A, B, C, D of integer values, compute how many tuples (i, j, k, l) there are such that A[i] + B[j] + C[k] + D[l] is zero. To make 阅读全文
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题目： Given an array of n integers nums and a target, find the number of index triplets i, j, k with 0 <= i < j < k < n that satisfy the condition nums[ 阅读全文
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题目： Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integ 阅读全文
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题目： Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array 阅读全文
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题目： Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum 阅读全文
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题目： Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would hav 阅读全文
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题目： You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes co 阅读全文