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A correct C solution to Clone Graph does not compile

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Seit 17.10.2026.

  • #333 von @Wu-1127 — offen

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Beschreibung

Observed behavior

The C starter for Clone Graph (shown as Sandbox Topology Replica) documents the node as struct Node { int val; int numNeighbors; struct Node** neighbors; }, matching LeetCode's C template, but the C harness in web/compiler-explorer.js declares that field as neighborsSize. A correct solution that follows the documented struct fails to compile with four no member named 'numNeighbors' errors, so no test case runs. The compiler note now points only at <test harness>, so the name the harness expects is not shown anywhere a candidate can read it.

Expected behavior

A solution written against the struct in the starter comment compiles and is graded. Renaming the field to neighborsSize in the same solution passes all five cases, so only the field name differs.

Reproduction
  1. Open Sandbox Topology Replica and select C.
  2. Write a DFS clone that uses the documented field, e.g. clone->numNeighbors = node->numNeighbors; and for (int i = 0; i < node->numNeighbors; i++).
  3. Run the tests.
CodeTrial version

codetrial 0.1.0 (34f5617)

Environment

OS: macOS <26.4.1> (arm64)
Browser: chrome <155.0.8059.40 >
Language: C
Interview loop: coding
Problem: Sandbox Topology Replica (Clone Graph)
REACTO or STAR step: Code (running tests)
Reconnect: none

Sanitized evidence
<source>:19:12: error: no member named 'numNeighbors' in 'struct Node'; did you mean 'neighbors'?
   19 |     clone->numNeighbors = node->numNeighbors;
<test harness>: note: 'neighbors' declared here
<source>:22:31: error: no member named 'numNeighbors' in 'struct Node'; did you mean 'neighbors'?
   22 |     for (int i = 0; i < node->numNeighbors; i++) {
4 errors generated.
Public data confirmation
  • I removed credentials, session tokens, candidate recordings, and personal interview content from this public report.
Vorherrschende Sprache
Rust
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1 T. 10 Std.
Gemergte PRs (30 T.)
191

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  4. Öffnen Sie einen Pull Request, der die Issue-Nummer nennt.

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