Problem:
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 of zero.Note:
Elements in a triplet (a,b,c) must be in non-descending order. (ie, a ≤ b ≤ c)
The solution set must not contain duplicate triplets.
Example:
Given array = {-1 0 1 2 -1 -4},
Solution set is:
(-1, 0, 1)
(-1, -1, 2)
JavaScript Code
function threeSum(num) { //sort array num.sort(); var result = []; var each = []; for(var i=0; i<num.length; i++){ if(num[i] > 0) break; for(var j=i+1; j<num.length; j++){ if(num[i] + num[j] > 0 && num[j] > 0) break; for(var k=j+1; k<num.length; k++){ if(num[i] + num[j] + num[k] == 0) { each.push(num[i]); each.push(num[j]); each.push(num[k]); result.push(each); each = []; } } } } return result; } console.log(threeSum([-1,0,1,2,-1,-4]));
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