feat: 3sum 문제풀이

Author: jinah92

3sum/jinah92.py

@@ -0,0 +1,19 @@
+# 공간복잡도 : O(1), 시간복잡도 : O(N^2)
+class Solution:
+    def threeSum(self, nums: List[int]) -> List[List[int]]:
+        three_sums = set()
+        nums.sort()
+
+        for i in range(len(nums)-2):
+            low, high = i + 1, len(nums)-1
+            while low < high:
+                three_sum = nums[i] + nums[high] + nums[low]
+                if three_sum < 0:
+                    low += 1
+                elif three_sum > 0:
+                    high -= 1
+                else:
+                    three_sums.add((nums[i], nums[high], nums[low]))
+                    low, high = low+1, high-1
+            
+        return list(three_sums)