Find Affected Systems
Reported by candidates from Wells Fargo's online assessment. Pattern, common pitfall, and the honest play if you blank under the timer.
Wells Fargo's OA in October asked you to find affected systems, and candidates reported zero clarity on what 'affected' meant. This is a classic graph or tree traversal problem dressed up in business language. The real question is whether you're doing depth-first search, breadth-first search, or some kind of dependency tracking across a network. Without the full problem text, the pattern is hidden in the specifics of the input format and what 'affected' means in context. StealthCoder will read the actual constraint and hand you the algorithm when you're live.
Pattern and pitfall
This problem likely involves traversing a system dependency graph or tree to find all nodes reachable from a failure point. The trick is understanding whether 'affected' means direct children, all descendants, or nodes connected by a specific relationship type. Graph problems at Wells Fargo often hide the traversal method in the problem statement. If systems are listed as dependencies, you're doing DFS or BFS to mark reachable nodes. If there's a matrix of system interactions, you might need to count connected components or do a union-find. The common pitfall is assuming the structure when the input format tells you what to do. StealthCoder removes the ambiguity by reading the full problem on your screen and pointing you at the right algorithm before you waste time coding the wrong one.
Memorize the pattern. If you can't, run StealthCoder. The proctor sees the IDE. They don't see what's behind it.
You can drill Find Affected Systems cold, or you can hedge it. StealthCoder runs invisibly during screen share and surfaces a working solution in under 2 seconds. The proctor sees the IDE. They don't see what's behind it. Made by an engineer who treats the OA as theater. If yours is tonight, you don't have time to grind. You have time to hedge.
Get StealthCoderRelated leaked OAs
This OA pattern shows up on LeetCode as number of connected components in an undirected graph. If you have time before the OA, drill that.
You've seen the question.
Make sure you actually pass Wells Fargo's OA.
Wells Fargo reuses patterns across OAs. Made by an engineer who treats the OA as theater. If yours is tonight, you don't have time to grind. You have time to hedge. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Find Affected Systems FAQ
Is this just graph traversal?+
Almost certainly. You're either doing DFS, BFS, or counting connected components. The tricky part is parsing the input to build the graph correctly. Read the examples first to reverse-engineer the structure before you write a single line of code.
What if 'affected' means transitive dependencies?+
Then you're doing a full traversal from a source system. DFS is usually cleaner for this. Recursive DFS handles transitive closure naturally. Be careful with cycles in the dependency graph. Mark visited nodes to avoid infinite loops.
Can I prepare for this in 24 hours?+
Not from scratch. Graph traversal is a pattern you either know or you don't. But you can do 3-4 standard DFS/BFS problems on LeetCode tonight. Focus on the template, not memorizing solutions. The OA will be a variant.
Should I assume the input is a tree or a general graph?+
Never assume. Look at the examples. If systems can depend on multiple other systems and form cycles, it's a general graph. Build an adjacency list either way. It's the safest approach and works for both.
What's the Wells Fargo version of this problem?+
Financial systems have real dependencies and risk cascades. 'Affected' probably means systems downstream of a failure. Your job is to find the blast radius. This is real infrastructure thinking, not toy graph stuff.