Clarify DFS loop termination logic is correct

[Copilot]

Addressed feedback questioning whether DFS traversal checks for early termination are needed in the correctness evaluation loop.

Analysis

The loop iterates Math.min(exp1.length, exp2.length) times over two expression trees:

for (let i = 0; i < Math.min(exp1.length, exp2.length); i++)
{
    if (exp1[exp1CurrentNode].content == exp2[exp2CurrentNode].content)
        identicalNodesCount++;

    exp1CurrentNode = findNextInDFS(exp1, 0, exp1CurrentNode);
    exp2CurrentNode = findNextInDFS(exp2, 0, exp2CurrentNode);
}

findNextInDFS returns -1 only after visiting all n nodes in a tree of length n. Since the loop runs for min(n,m) iterations and both trees have at least that many nodes, neither DFS can return -1 within the loop bounds.

Changes

No code changes required. Confirmed existing logic is correct.

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