LeetCode Answers for 01st and 2nd

Python/0001. Two sum.py

@@ -0,0 +1,13 @@
+class Solution(object):
+    def twoSum(self, nums, target):
+        for i in range(len(nums)):
+            for j in range(i+1,len(nums)):
+                if nums[i]+nums[j]==target:
+                    return [i,j]
+
+
+if __name__ == "__main__":
+    nums = [2,7,11,15]
+    target = 9
+    result = Solution().twoSum(nums,target)
+    print(result)

Python/0002. Add two numbers.py

@@ -0,0 +1,29 @@
+class ListNode(object):
+    def __init__(self, val=0, next=None):
+        self.val = val
+        self.next = next
+
+class Solution(object):
+    def addTwoNumbers(self,l1: ListNode,l2: ListNode) -> ListNode:
+        dummy = ListNode()
+        current = dummy
+
+        carry = 0
+        while l1 or l2 or carry:
+            v1 = l1.val if l1 else 0
+            v2 = l2.val if l2 else 0
+
+            # new digit
+            val = v1 + v2 + carry
+            carry = val//10
+            val = val%10
+            current.next = ListNode(val)
+
+            current = current.next
+            l1 = l1.next if l1 else None
+            l2 = l2.next if l2 else None
+
+        return dummy.next
+
+if __name__ == "__main__":
+    pass