Create PeakElementArray.cpp

PeakElementArray.cpp

@@ -0,0 +1,33 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+int peakElement(vector<int> &arr) {
+    int n = arr.size();
+
+    for(int i = 0; i < n; i++) {
+    	bool left = true;
+        bool right = true;
+
+        // Check for element to the left
+        if(i > 0 && arr[i] <= arr[i - 1]) 
+            left = false;
+
+        // Check for element to the right
+        if(i < n - 1 && arr[i] <= arr[i + 1])
+            right = false;
+
+        // If arr[i] is greater than its left as well as
+        // its right element, return its index
+        if(left && right) {
+        	return i;
+        }
+    }
+    return 0;
+}
+
+int main() {
+    vector<int> arr = {1, 2, 4, 5, 7, 8, 3};
+    cout << peakElement(arr);
+    return 0;
+}