Merge pull request yychuyu#794 from MyJavaRoad/master

youransuifeng

Author: yychuyu

problems/0001_Two_Sum/youransuifeng.java

@@ -0,0 +1,14 @@
+class Solution {
+    public int[] twoSum(int[] nums, int target) {
+        HashMap<Integer , Integer> map = new HashMap<>();
+        for(int i = 0; i < nums.length; i++){
+            if(map.containsKey(nums[i])){
+                return new int[]{map.get(nums[i]),i};
+            }else{
+                map.put(target-nums[i],i);
+            }
+        }
+        return null; 
+        
+    }
+}

problems/0002_Add_Two_Numbers/youransuifeng.java

@@ -0,0 +1,30 @@
+/**
+ * Definition for singly-linked list.
+ * public class ListNode {
+ *     int val;
+ *     ListNode next;
+ *     ListNode(int x) { val = x; }
+ * }
+ */
+class Solution {
+    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
+        if(l1 == null && l2 == null){
+            return null;
+        }else if(l1 == null || l2 == null){
+            return l1 != null ? l1:l2;
+        }else{
+            ListNode l3;
+            if(l1.val + l2.val < 10){
+                l3 = new ListNode(l1.val + l2.val);
+                l3.next = addTwoNumbers(l1.next , l2.next);
+            }else{
+                l3 = new ListNode(l1.val + l2.val - 10);
+                l3.next = addTwoNumbers(addTwoNumbers(l1.next , new ListNode(1)) , l2.next);
+            }
+            return l3;
+        }
+        
+       
+        
+    }
+}

submittors/悠然随风.txt

@@ -0,0 +1 @@
+fe6d4836e9f2a4497e56748227112d155f025778