2025 MCC OA | Millennium OA | Millennium Challenge Corporation OA

Overview of topics

MCC OA is primarily Code-based.MCC Recently released OA in bulk, takes about 90 minutes to complete and contains three algorithmic questions:

1. Array Reduction: Merge elements to a single value using minimum cost.
2. Connected Groups: Count the number of interconnected groups in the social matrix.
3. Build a Wall counts:: The number of wall construction options that satisfy the staggered joint condition for brick combinations with a width of 2 or 3.

Key ideas

• Array reductions: greedy + minimal heap-first merge of smallest elements.
• Connected groups: dfs/parallel set traversal of connected components.
• Build wall counting: dynamic planning generates all single layer seam layouts, then does seamless counting for multiple layers.

Code examples (Python)

import heapq

def reductionCost(nums).
    heapq.heapify(nums)
    cost = 0
    cost = 0 while len(nums) > 1: while heapq.heapify(nums): heapq.
        a = heapq.heappop(nums)
        b = heapq.heappop(nums)
        cost += a + b
        heapq.heappush(nums, a + b)
    return cost

concluding remarks

Solve three questions in ten minutes or less. If you need OA tutoring or interview coaching services, pleaseContact Us.

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