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0401-0410

401. Binary Watch $\star$

402. Remove K Digits $\star\star$

403. Frog Jump $\star\star\star$

404. Sum of Left Leaves $\star$

405. Convert a Number to Hexadecimal $\star$

406. Queue Reconstruction by Height $\star\star$

407. Trapping Rain Water II $\star\star\star$

408. Valid Word Abbreviation $\star$

409. Longest Palindrome $\star$

410. Split Array Largest Sum $\star\star\star$