+ HackerRank 1week preparation kit solving

+ HackerRank Python builtin libraries usage

Author: Tuhin-thinks

HackerRank/1-Week-Preparation-Kit/Day-1/mini-max-sum.py

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+"""
+Problem solved: https://www.hackerrank.com/challenges/one-week-preparation-kit-mini-max-sum/problem?h_l=interview&isFullScreen=true&playlist_slugs%5B%5D%5B%5D=preparation-kits&playlist_slugs%5B%5D%5B%5D=one-week-preparation-kit&playlist_slugs%5B%5D%5B%5D=one-week-day-one
+"""
+
+
+def miniMaxSum(arr):
+    sorted_arr = sorted(arr)
+    print(sum(sorted_arr[:4]), sum(sorted_arr[-4:]))
+
+
+if __name__ == '__main__':
+    arr = list(map(int, input().rstrip().split()))
+
+    miniMaxSum(arr)

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

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+"""
+Problem solved: https://www.hackerrank.com/challenges/one-week-preparation-kit-plus-minus/problem?isFullScreen=true&h_l=interview&playlist_slugs%5B%5D=preparation-kits&playlist_slugs%5B%5D=one-week-preparation-kit&playlist_slugs%5B%5D=one-week-day-one
+"""
+# !/bin/python3
+
+import math
+import os
+import random
+import re
+import sys
+from collections import defaultdict
+
+
+#
+# Complete the 'plusMinus' function below.
+#
+# The function accepts INTEGER_ARRAY arr as parameter.
+#
+
+def plusMinus(arr):
+    d = defaultdict(int)
+    for i in arr:
+        if i > 0:
+            d['pos'] += 1
+        elif i < 0:
+            d['neg'] += 1
+        else:
+            d['zero'] += 1
+
+    # find ratios of positive, negative and zero
+    pos_ratio = d['pos'] / len(arr)
+    neg_ratio = d['neg'] / len(arr)
+    zero_ratio = d['zero'] / len(arr)
+
+    # print the ratios
+    print(f"{pos_ratio:.06f}")
+    print(f"{neg_ratio:.06f}")
+    print(f"{zero_ratio:.06f}")
+
+
+if __name__ == '__main__':
+    n = int(input().strip())
+
+    arr = list(map(int, input().rstrip().split()))
+
+    plusMinus(arr)

HackerRank/1-Week-Preparation-Kit/Day-1/time-conversion.py

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+#!/bin/python3
+
+"""
+Problem solved: https://www.hackerrank.com/challenges/one-week-preparation-kit-time-conversion/problem?h_l=interview&isFullScreen=true&playlist_slugs%5B%5D%5B%5D=preparation-kits&playlist_slugs%5B%5D%5B%5D=one-week-preparation-kit&playlist_slugs%5B%5D%5B%5D=one-week-day-one
+"""
+
+import math
+import os
+import random
+import re
+import sys
+from datetime import datetime
+
+
+#
+# Complete the 'timeConversion' function below.
+#
+# The function is expected to return a STRING.
+# The function accepts STRING s as parameter.
+#
+
+def timeConversion(s):
+    return datetime.strptime(s, "%I:%M:%S%p").strftime("%H:%M:%S")
+
+
+if __name__ == '__main__':
+    fptr = open(os.environ['OUTPUT_PATH'], 'w')
+
+    s = input()
+
+    result = timeConversion(s)
+
+    fptr.write(result + '\n')
+
+    fptr.close()

PythonBuiltins/collections-defaultdict.py

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+"""
+Problem solved: https://www.hackerrank.com/challenges/defaultdict-tutorial/problem?isFullScreen=true
+"""
+
+from collections import defaultdict
+
+n, m = map(int, input().split())
+group_a_dict = defaultdict(list)
+for index in range(n):
+    group_a_dict[input()].append(index + 1)
+
+d = defaultdict(list)
+
+for _ in range(m):
+    print(*group_a_dict[input()] or [-1])

PythonBuiltins/itertools-permutations.py

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+from itertools import permutations
+
+sk = input().split()
+
+s = sk[0]
+k = int(sk[1])
+
+perms = permutations(s, k)
+perms_list = sorted([''.join(p) for p in perms])
+print('\n'.join(perms_list))