Qorvo Software Engineer
Interview Questions & Guide 2026

from collections import deque

def task_order(tasks, edges):
    if len(set(tasks)) != len(tasks):
        raise ValueError("duplicate task")
    adj = {task: [] for task in tasks}
    degree = {task: 0 for task in tasks}
    seen = set()
    for before, after in edges:
        if before not in adj or after not in adj:
            raise ValueError("unknown endpoint")
        if (before, after) not in seen:
            seen.add((before, after)); adj[before].append(after); degree[after] += 1
    ready = deque(task for task in tasks if degree[task] == 0)
    result = []
    while ready:
        task = ready.popleft(); result.append(task)
        for after in adj[task]:
            degree[after] -= 1
            if degree[after] == 0:
                ready.append(after)
    if len(result) != len(tasks):
        raise ValueError("cycle")
    return result

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CREATE TABLE calibrations (tenant TEXT, device_id TEXT, calibration_id INTEGER, completed_at INTEGER, status TEXT);
INSERT INTO calibrations VALUES
 ('a','d1',1,10,'completed'),('a','d1',2,20,'completed'),
 ('a','d1',9,30,'failed'),('a','d2',3,15,'completed'),('b','d1',99,99,'completed');
WITH ranked AS (
 SELECT *,ROW_NUMBER() OVER (
  PARTITION BY tenant,device_id ORDER BY completed_at DESC,calibration_id DESC
 ) rn FROM calibrations WHERE tenant='a' AND status='completed'
)
SELECT device_id,calibration_id FROM ranked WHERE rn=1 ORDER BY device_id;

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