diff --git a/LeetCode/Find the Index of the First Occurrence in a String.cpp b/LeetCode/Find the Index of the First Occurrence in a String.cpp
new file mode 100644
index 0000000..899fc10
--- /dev/null
+++ b/LeetCode/Find the Index of the First Occurrence in a String.cpp	
@@ -0,0 +1,19 @@
+using namespace std;
+
+class Solution {
+public:
+    int strStr(string haystack, string needle) {
+        int haystackLen = haystack.length();
+        int needleLen = needle.length();
+
+        if (needleLen == 0) return 0;
+
+        for (int i = 0; i <= haystackLen - needleLen; i++){
+            if (haystack.substr(i, needleLen) == needle){
+                return i;
+            }
+        }
+
+        return -1;
+    }
+};
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