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Successful placements everywhere.

Jump Trading asked this one.

Many of these come straight from real trading interviews. You solve it in a full editor, then run it against the actual test cases that decide the result.

Jump (trading) exactly a couple times.

MediumLanguage KnowledgeJump

You are given an integer array arr of size n and an integer k. You start at index 0 and perform exactly k moves. On each move you may either stay at your current index or advance to index i + 1 (if it exists). Before each move, you collect points equal to arr[i] where i is your current position.

Return the maximum total score achievable after exactly k moves.

Example 1

C++

arr = [1, 2, 3], k = 3 -> 6

// Collect at 0 (1), advance. Collect at 1 (2), advance. Collect at 2 (3).

// Total = 6.

Example 2

C++

arr = [1, 20, 3], k = 3 -> 41

// Collect at 0 (1), advance. Collect at 1 (20), stay. Collect at 1 (20).

// Total = 41.

Constraints

1 <= n <= 10^5
1 <= k <= 10^5
arr[i] are all integers (including negative)

1// C++23 using GCC 14.2

2// Debug with std::cerr

4long long max_score(const std::vector<int>& arr, const int k) {

5 // Implementation

6 return 0;

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Real interview problems from top quant companies. Master the fundamentals that interviewers actually ask.

Three by three

What is the value of grid after running this code?

grid = [[0] * 3] * 3
grid[0][0] = 3

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Implement std::sqrt for decimals between 0 and X

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