1. 問題描述

Find a triplet that sum to a given value

Given an array and a value, find if there is a triplet in array whose sum is equal to the given value. If there is such a triplet present in array, then print the triplet and return true.Else return false. For example, if the given array is {12, 3, 4, 1, 6, 9} and given sum is 24, then there is a triplet (12, 3 and 9) present in array whose sum is 24.

給定一個數組，判斷是否有三個元素之和為給等的值，如存在返回true，否則返回false。

2. 解答

這里提供兩種解答方案：

1). Brute force: O(n^3)

2). O(n^2), Sort the array first.