Explanation: Diameter is shown in red color.

Example 2

graph TD
    A(1) --- B(2)
    B --- C(3) & D(4)
    C --- E(5)
    D --- F(6)

classDef hidden display:none
linkStyle 1 stroke:#FF0000,stroke-width:2px;
linkStyle 2 stroke:#FF0000,stroke-width:2px;
linkStyle 3 stroke:#FF0000,stroke-width:2px;
linkStyle 4 stroke:#FF0000,stroke-width:2px;

Input: root = [1,null,2,null,3,4,null,5,null,6]
Output: 4

Example 3

graph TD
    A(1)
    A --- B(2) & C(3) & D(4) & E(5)
    C --- F(6) & G(7)
    D --- H(8) --- L(12)
    G --- K(11) --- N(14)
    E --- I(9) & J(10)
    I --- M(13)

    linkStyle 1 stroke:#FF0000,stroke-width:2px;
    linkStyle 2 stroke:#FF0000,stroke-width:2px;
    linkStyle 5 stroke:#FF0000,stroke-width:2px;
    linkStyle 6 stroke:#FF0000,stroke-width:2px;
    linkStyle 8 stroke:#FF0000,stroke-width:2px;
    linkStyle 9 stroke:#FF0000,stroke-width:2px;
    linkStyle 7 stroke:#FF0000,stroke-width:2px;

Input:

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