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Infection (389)

Instruction:
Fill some cells with a number from 1 to 4. All numbered cells must be orthogonally connected. Orthogonally adjacent cells cannot contain the same number. Each number must indicate the number of orthogonally adjacent numbered cells. Some numbers are given to you.

Reference: WPF (1)

Examples:
WPF Puzzle GP 2018 - Round 6 (56)
WPF Puzzle GP 2020 - Round 3 (142)
WPF Puzzle GP 2021 - Round 2 (166)