hk day 1

Author: mohanakrishnavh

Hackerrank/HourGlassSum.py

@@ -0,0 +1,15 @@
+import sys
+
+
+def hour_glass_sum(arr):
+    rows = cols = len(arr) - 1
+    max_sum = -sys.maxsize
+
+    for i in range(rows - 1):
+        for j in range(cols - 1):
+            current_hour_glass_sum = arr[i][j] + arr[i][j + 1] + arr[i][j + 2] + arr[i + 1][j + 1] + arr[i + 2][j] + arr[i + 2][
+                j + 1] + arr[i + 2][j + 2]
+
+            if current_hour_glass_sum > max_sum:
+                max_sum = current_hour_glass_sum
+    return max_sum

Hackerrank/ReverseArrayInplace.py

@@ -0,0 +1,9 @@
+def reverse_array(a):
+    i = 0
+    j = len(a) - 1
+    while i <= j:
+        a[i], a[j] = a[j], a[i]
+        i += 1
+        j -= 1
+    return a
+