FastPrep
Problem · Array

Get Average Standing 🍑

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As an aspiring developer, you are required to develop a result analysis service for a car game on Amazon games.

There are n even records of d players who participated in different events in form of [race id, player's id, player's time]. For some race id, a player's ranking id decided based on the increasing order of their finish time. If two players have the same finish time, the one with a lower id is ranked lower.

The average standing of any player is the average of their various positions in all the races they competed in, expressed in the form of a fraction p/q. If there are multiple possible such fractions, reduce them such that p is the minimum possible.

Return a 2-dimensional array where each element i contains the ith player's p and q as described above. If the player did not compete in any races, the player's p and q values are both -1.

Complete the function getAverageStanding which has the following parameters:

  • int d: the number of players
  • int records[n][3]: each record[i] contains [race id, player id, player time]
Examples
01 · Example 1
d = 3
records = [[1, 1, 100], [1, 2, 200], [2, 1, 500]]
return = [[-1, -1], [1, 1], [2, 1]]
There are a total of d = 3 players. - Player 0 did not compete in any race, so p0 = -1 and q0 = -1. - Player 1 competed in 2 races and came first in both. Their average standing is (1+1)/2. Reduce as described so p1 = 1 and q1 = 1. - Player 2 competed in 1 race and came second. Their average standing is (2)/1. Thus, p2 = 2 and q2 = 1.
Constraints

N/A (If you know it, feel free to let us know ^^ tyvm!

More Amazon problems
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public int[][] getAverageStanding(int d, int[][] records) {
  // write your code here
}
d3
records[[1, 1, 100], [1, 2, 200], [2, 1, 500]]
expected[[-1, -1], [1, 1], [2, 1]]
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