updated gitignore to ignore txt files

Author: Tuhin-thinks

.gitignore

@@ -13,3 +13,4 @@ testing_env/
 # ignore files generate from C++ or C programs
 **.out
 **.exe
+*.txt

HackerRank/1-Week-Preparation-Kit/Day-1/mock_test_d1.py

@@ -0,0 +1,16 @@
+"""
+Find the media element of the array
+"""
+
+
+def findMedian(arr):
+    """
+    find median element from the arr
+    :param arr:
+    :return:
+    """
+    len_arr = len(arr)
+    if len_arr > 1:
+        return list(sorted(arr))[len_arr // 2]
+    else:
+        return arr[0]

HackerRank/1-Week-Preparation-Kit/Day-2/diagonal-difference.py

@@ -0,0 +1,24 @@
+def diagonalDifference(arr):
+    left_diagonal_sum = 0
+    for i in range(len(arr)):
+        for j in range(len(arr[0])):
+            if i == j:
+                left_diagonal_sum += arr[i][j]
+                break
+
+    right_diagonal_sum = 0
+    for row in range(len(arr)):
+        for col in range(len(arr) - 1, -1, -1):
+            if row == len(arr) - col - 1:
+                right_diagonal_sum += arr[row][col]
+    return abs(right_diagonal_sum - left_diagonal_sum)
+
+
+if __name__ == '__main__':
+    n = int(input())
+    arr = []
+    for _ in range(n):
+        arr.append(list(map(int, input().split())))
+
+    result = diagonalDifference(arr)
+    print(result)

HackerRank/1-Week-Preparation-Kit/Day-2/lonely-integer.py

@@ -0,0 +1,12 @@
+from collections import Counter
+
+
+#
+# Complete the 'lonelyinteger' function below.
+#
+# The function is expected to return an INTEGER.
+# The function accepts INTEGER_ARRAY a as parameter.
+#
+
+def lonelyinteger(a):
+    return [k for k, v in Counter(a).items() if v == 1][0]