Climbing the Leaderboard | HackerRank Solution

Hello coders, today we are going to solve Climbing the Leaderboard HackerRank Solution which is a Part of HackerRank Algorithm Series.

Task

An arcade game player wants to climb to the top of the leaderboard and track their ranking. The game uses Dense Ranking, so its leaderboard works like this:

• The player with the highest score is ranked number 1 on the leaderboard.
• Players who have equal scores receive the same ranking number, and the next player(s) receive the immediately following ranking number.

Example

ranked = [100, 90, 90, 80]
player = [70, 80, 105]
The ranked players will have ranks 1, 2, 2, and 3, respectively. If the player’s scores are 70, 80 and 105, their rankings after each game are 4^th, 3^rd and 1^st. Return [4, 3, 1].

Function Description

Complete the climbingLeaderboard function in the editor below.

climbingLeaderboard has the following parameter(s):

• int ranked[n]: the leaderboard scores
• int player[m]: the player’s scores

Returns

• int[m]: the player’s rank after each new score

Input Format

The first line contains an integer n, the number of players on the leaderboard.
The next line contains n space-separated integers ranked[i], the leaderboard scores in decreasing order.
The next line contains an integer, m, the number games the player plays.
The last line contains m space-separated integers player[j], the game scores.

Constraints

•  1 <= n <= 2 x 10⁵
• 1 <= m <= 2 x 10⁵
• 0 <= ranked[i] <= 10⁹ for 0 <= i < n 
• 0 <= player[j] <= 10⁹ for 0 <= j < m
• The existing leaderboard, ranked, is in descending order.
• The player’s scores, player, are in ascending order.

Subtask

For 60% of the maximum score:

• 1 <= n <= 200
• 1 <= m <= 200

Sample Input 1

7
100 100 50 40 40 20 10
4
5 25 50 120

Sample Output 1

6
4
2
1

Explanation 1

Alice starts playing with 7 players already on the leaderboard, which looks like this:
After Alice finishes game 0, her score is 5 and her ranking is 6:
After Alice finishes game 1, her score is 25 and her ranking is 4:
After Alice finishes game 2, her score is 50 and her ranking is tied with Caroline at 2:
After Alice finishes game 3, her score is 120 and her ranking is 1:

Sample Input 2

6
100 90 90 80 75 60
5
50 65 77 90 102

Sample Output 2

6
5
4
2
1

Solution – Climbing the Leaderboard

C++

#include <ios>
#include <iostream>
#include <vector>
#include <algorithm>

std::vector<int> vec;

int main()
{
    int n, q, v;
    std::cin >> n;
    for (int i = 0; i < n; i++)
    {
        std::cin >> v;
        vec.push_back(v);
    }
    std::sort(vec.begin(), vec.end());
    vec.resize(std::distance(vec.begin(), std::unique(vec.begin(), vec.end())));
    std::cin >> q;
    while (q--)
    {
        std::cin >> v;
        std::cout << std::distance(std::upper_bound(vec.begin(), vec.end(), v), vec.end())+1 << '\n';
    }
}

Python

import sys
import bisect


n = int(input().strip())
scores = [int(scores_temp) for scores_temp in input().strip().split(' ')]
m = int(input().strip())
alice = [int(alice_temp) for alice_temp in input().strip().split(' ')]

scores = list(sorted(set(scores)))
aa = [bisect.bisect_right(scores, a) for a in alice]
for a in aa:
    v = len(scores) + 1 - a
    print(v)

Java

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        Stack<Integer> scores = new Stack<>();
        scores.push(in.nextInt());
        for (int i = 1; i < n; i++) {
            int cur = in.nextInt();
            if (!scores.peek().equals(cur)) scores.push(cur);
        }
        int m = in.nextInt();
        for (int i = 0; i < m; i++) {
            int cur = in.nextInt();
            while (scores.size() > 0 && cur > scores.peek()) scores.pop();
            System.out.println(scores.size() +(scores.size() > 0 && scores.peek().equals(cur) ? 0 : 1));
        }
    }
}

Disclaimer: The above Problem (Climbing the Leaderboard) is generated by Hacker Rank but the Solution is Provided by CodingBroz. This tutorial is only for Educational and Learning Purpose.