Nested Lists - Hacker Rank Solution

Given the names and grades for each student in a Physics class of  students, store them in a nested list and print the name(s) of any student(s) having the second lowest grade.

Note: If there are multiple students with the same grade, order their names alphabetically and print each name on a new line.

Input Format

The first line contains an integer, , the number of students.
The  subsequent lines describe each student over  lines; the first line contains a student's name, and the second line contains their grade.

Constraints

• There will always be one or more students having the second lowest grade.

Output Format

Print the name(s) of any student(s) having the second lowest grade in Physics; if there are multiple students, order their names alphabetically and print each one on a new line.

Sample Input 0

5
Harry
37.21
Berry
37.21
Tina
37.2
Akriti
41
Harsh
39

Sample Output 0

Berry
Harry

Explanation 0

There are  students in this class whose names and grades are assembled to build the following list:

python students = [['Harry', 37.21], ['Berry', 37.21], ['Tina', 37.2], ['Akriti', 41], ['Harsh', 39]]

The lowest grade of  belongs to Tina. The second lowest grade of  belongs to both Harry and Berry, so we order their names alphabetically and print each name on a new line.

Nested Lists  - Hacker Rank Solution

We can solve this challenge by using nested list.

Problem Setter's code:

from __future__ import print_function
score_list = {}
for _ in range(input()):
    name = raw_input()
    score = float(raw_input())
    if score in score_list:
        score_list[score].append(name)
    else:
        score_list[score] = [name]
new_list = []
for i in score_list:
    new_list.append([i, score_list[i]])
new_list.sort()
result = new_list[1][1]
result.sort()
print (*result, sep = "\n")

Problem Tester's code:

a = [[raw_input(), float(raw_input())] for i in xrange(int(raw_input()))]
s = sorted(set([x[1] for x in a]))
for name in sorted(x[0] for x in a if x[1] == s[1]):
    print name