[LeetCode] 16.3Sum

leetcode.com/problems/3sum/

 

1. Problem

Given an array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.

Notice that the solution set must not contain duplicate triplets.

 

Example 1:

Input: nums = [-1,0,1,2,-1,-4]

Output: [[-1,-1,2],[-1,0,1]]

 

Example 2:

Input: nums = []

Output: []

 

Example 3:

Input: nums = [0]

Output: []

 

Constraints:

• 0 <= nums.length <= 3000
• -105 <= nums[i] <= 105

2. Code

package leetCode;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import com.sun.xml.internal.bind.v2.runtime.unmarshaller.XsiNilLoader.Array;

public class threeSum {

	public static void main(String[] args) {
		//int[] nums = {82597,-9243,62390,83030,-97960,-26521,-61011,83390,-38677,12333,75987,46091,83794,19355,-71037,-6242,-28801,324,1202,-90885,-2989,-95597,-34333,35528,5680,89093,-90606,50360,-29393,-27012,53313,65213,99818,-82405,-41661,-3333,-51952,72135,-1523,26377,74685,96992,92263,15929,5467,-99555,-43348,-41689,-60383,-3990,32165,65265,-72973,-58372,12741,-48568,-46596,72419,-1859,34153,62937,81310,-61823,-96770,-54944,8845,-91184,24208,-29078,31495,65258,14198,85395,70506,-40908,56740,-12228,-40072,32429,93001,68445,-73927,25731,-91859,-24150,10093,-60271,-81683,-18126,51055,48189,-6468,25057,81194,-58628,74042,66158,-14452,-49851,-43667,11092,39189,-17025,-79173,13606,83172,92647,-59741,19343,-26644,-57607,82908,-20655,1637,80060,98994,39331,-31274,-61523,91225,-72953,13211,-75116,-98421,-41571,-69074,99587,39345,42151,-2460,98236,15690,-52507,-95803,-48935,-46492,-45606,-79254,-99851,52533,73486,39948,-7240,71815,-585,-96252,90990,-93815,93340,-71848,58733,-14859,-83082,-75794,-82082,-24871,-15206,91207,-56469,-93618,67131,-8682,75719,87429,-98757,-7535,-24890,-94160,85003,33928,75538,97456,-66424,-60074,-8527,-28697,-22308,2246,-70134,-82319,-10184,87081,-34949,-28645,-47352,-83966,-60418,-15293,-53067,-25921,55172,75064,95859,48049,34311,-86931,-38586,33686,-36714,96922,76713,-22165,-80585,-34503,-44516,39217,-28457,47227,-94036,43457,24626,-87359,26898,-70819,30528,-32397,-69486,84912,-1187,-98986,-32958,4280,-79129,-65604,9344,58964,50584,71128,-55480,24986,15086,-62360,-42977,-49482,-77256,-36895,-74818,20,3063,-49426,28152,-97329,6086,86035,-88743,35241,44249,19927,-10660,89404,24179,-26621,-6511,57745,-28750,96340,-97160,-97822,-49979,52307,79462,94273,-24808,77104,9255,-83057,77655,21361,55956,-9096,48599,-40490,-55107,2689,29608,20497,66834,-34678,23553,-81400,-66630,-96321,-34499,-12957,-20564,25610,-4322,-58462,20801,53700,71527,24669,-54534,57879,-3221,33636,3900,97832,-27688,-98715,5992,24520,-55401,-57613,-69926,57377,-77610,20123,52174,860,60429,-91994,-62403,-6218,-90610,-37263,-15052,62069,-96465,44254,89892,-3406,19121,-41842,-87783,-64125,-56120,73904,-22797,-58118,-4866,5356,75318,46119,21276,-19246,-9241,-97425,57333,-15802,93149,25689,-5532,95716,39209,-87672,-29470,-16324,-15331,27632,-39454,56530,-16000,29853,46475,78242,-46602,83192,-73440,-15816,50964,-36601,89758,38375,-40007,-36675,-94030,67576,46811,-64919,45595,76530,40398,35845,41791,67697,-30439,-82944,63115,33447,-36046,-50122,-34789,43003,-78947,-38763,-89210,32756,-20389,-31358,-90526,-81607,88741,86643,98422,47389,-75189,13091,95993,-15501,94260,-25584,-1483,-67261,-70753,25160,89614,-90620,-48542,83889,-12388,-9642,-37043,-67663,28794,-8801,13621,12241,55379,84290,21692,-95906,-85617,-17341,-63767,80183,-4942,-51478,30997,-13658,8838,17452,-82869,-39897,68449,31964,98158,-49489,62283,-62209,-92792,-59342,55146,-38533,20496,62667,62593,36095,-12470,5453,-50451,74716,-17902,3302,-16760,-71642,-34819,96459,-72860,21638,47342,-69897,-40180,44466,76496,84659,13848,-91600,-90887,-63742,-2156,-84981,-99280,94326,-33854,92029,-50811,98711,-36459,-75555,79110,-88164,-97397,-84217,97457,64387,30513,-53190,-83215,252,2344,-27177,-92945,-89010,82662,-11670,86069,53417,42702,97082,3695,-14530,-46334,17910,77999,28009,-12374,15498,-46941,97088,-35030,95040,92095,-59469,-24761,46491,67357,-66658,37446,-65130,-50416,99197,30925,27308,54122,-44719,12582,-99525,-38446,-69050,-22352,94757,-56062,33684,-40199,-46399,96842,-50881,-22380,-65021,40582,53623,-76034,77018,-97074,-84838,-22953,-74205,79715,-33920,-35794,-91369,73421,-82492,63680,-14915,-33295,37145,76852,-69442,60125,-74166,74308,-1900,-30195,-16267,-60781,-27760,5852,38917,25742,-3765,49097,-63541,98612,-92865,-30248,9612,-8798,53262,95781,-42278,-36529,7252,-27394,-5021,59178,80934,-48480,-75131,-54439,-19145,-48140,98457,-6601,-51616,-89730,78028,32083,-48904,16822,-81153,-8832,48720,-80728,-45133,-86647,-4259,-40453,2590,28613,50523,-4105,-27790,-74579,-17223,63721,33489,-47921,97628,-97691,-14782,-65644,18008,-93651,-71266,80990,-76732,-47104,35368,28632,59818,-86269,-89753,34557,-92230,-5933,-3487,-73557,-13174,-43981,-43630,-55171,30254,-83710,-99583,-13500,71787,5017,-25117,-78586,86941,-3251,-23867,-36315,75973,86272,-45575,77462,-98836,-10859,70168,-32971,-38739,-12761,93410,14014,-30706,-77356,-85965,-62316,63918,-59914,-64088,1591,-10957,38004,15129,-83602,-51791,34381,-89382,-26056,8942,5465,71458,-73805,-87445,-19921,-80784,69150,-34168,28301,-68955,18041,6059,82342,9947,39795,44047,-57313,48569,81936,-2863,-80932,32976,-86454,-84207,33033,32867,9104,-16580,-25727,80157,-70169,53741,86522,84651,68480,84018,61932,7332,-61322,-69663,76370,41206,12326,-34689,17016,82975,-23386,39417,72793,44774,-96259,3213,79952,29265,-61492,-49337,14162,65886,3342,-41622,-62659,-90402,-24751,88511,54739,-21383,-40161,-96610,-24944,-602,-76842,-21856,69964,43994,-15121,-85530,12718,13170,-13547,69222,62417,-75305,-81446,-38786,-52075,-23110,97681,-82800,-53178,11474,35857,94197,-58148,-23689,3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		int[] nums = {-4,-2,-2,-2,0,1,2,2,2,3,3,4,4,6,6};
		List<List<Integer>> threeSum = threeSum(nums);
		for(int i = 0 ; i < threeSum.size(); i++) {
			List<Integer> lt = threeSum.get(i);
			System.out.println(lt.get(0) + " " + lt.get(1) + " " + lt.get(2));
		}
	}
	public static  List<List<Integer>> threeSum(int[] nums) {
		List<List<Integer>> result = new ArrayList<List<Integer>>();
		Arrays.parallelSort(nums);

		for(int i = 0; i < nums.length-2; i++) {
			if(nums[i] > 0) break;
			if(i > 0 && nums[i] == nums[i-1] ) continue;

			int left = i+1;
			int right = nums.length-1;

			while(left < right) {
				int sum = nums[i] + nums[left] + nums[right];
				if(sum == 0) {
					List<Integer> tl = new ArrayList<>();
					tl.add(nums[i]);
					tl.add(nums[left]);
					tl.add(nums[right]);
					result.add(tl);
					left++;
					right--;
					while(nums[left] == nums[left-1] && left < right) left++;
					while(nums[right] == nums[right+1] && left < right) right--;
				} else if(sum < 0) {
					left++;
				} else if(sum > 0) {
					right--;
				}
			}
		}
		return result; 
	}
}

3. Problem

중복값을 제거하는게 젤 까다로웠다.

내가 처음 푼 방식은

left, right를 이용하는게 아니라 for문으로 int j, int k를 돌려서 사용하는 거였는데 시간이 훨씬 많이 걸렸다

left, right를 이용하면 정답을 찾고나서 left와 right 사이를 줄여주므로 더 적게 반복할 수 있다.

자꾸 TimeLimit나서 화나는 문제였다..