diff --git a/src/solution/Solution.java b/src/solution/Solution.java
index 76dc399..30c9e0a 100644
--- a/src/solution/Solution.java
+++ b/src/solution/Solution.java
@@ -226,4 +226,34 @@ public class Solution {
         }
         return dummy.next;
     }
+
+    public int strStr(String haystack, String needle) {
+        if (needle.isEmpty()) return -1;
+        return haystack.indexOf(needle);
+    }
+
+    public int searchInsert(int[] nums, int target) {
+        if (nums.length == 0) return 0;
+        for (int i = 0; i < nums.length; i++) {
+            if (nums[i] >= target) {
+                return i;
+            }
+        }
+        return nums.length;
+    }
+
+    public int lengthOfLastWord(String s) {
+        if (s.isEmpty()) return 0;
+        for (int i = s.length() - 1; i >= 0; i--) {
+            if (s.charAt(i) != ' ') {
+                int count = 0;
+                while (i >= 0 && s.charAt(i) != ' ') {
+                    count++;
+                    i--;
+                }
+                return count;
+            }
+        }
+        return 0;
+    }
 }