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refactor 366

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`5`	`5`	`importjava.util.ArrayList;`
`6`	`6`	`importjava.util.List;`
`7`	`7`
`8`		`-/**`
`9`		`- * 366. Find Leaves of Binary Tree`
`10`		`- *`
`11`		`- * Given a binary tree, collect a tree's nodes as if you were doing this:`
`12`		`- * Collect and remove all leaves, repeat until the tree is empty.`
`13`		`-`
`14`		`- Example:`
`15`		`- Given binary tree`
`16`		`- 1`
`17`		`- / \`
`18`		`- 2 3`
`19`		`- / \`
`20`		`- 4 5`
`21`		`- Returns [4, 5, 3], [2], [1].`
`22`		`-`
`23`		`- Explanation:`
`24`		`- 1. Removing the leaves [4, 5, 3] would result in this tree:`
`25`		`-`
`26`		`- 1`
`27`		`- /`
`28`		`- 2`
`29`		`- 2. Now removing the leaf [2] would result in this tree:`
`30`		`-`
`31`		`- 1`
`32`		`- 3. Now removing the leaf [1] would result in the empty tree:`
`33`		`-`
`34`		`- []`
`35`		`- Returns [4, 5, 3], [2], [1].`
`36`		`-`
`37`		`- */`
`38`	`8`	`publicclass_366 {`
`39`	`9`
`40`	`10`	`publicstaticclassSolution1 {`

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