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Update 0417-pacific-atlantic-water-flow.java

List.of is generally recommended over Arrays.asListbecause of the former gives immutable (a copy of the list)https://www.baeldung.com/java-arrays-aslist-vs-list-of#1-differences-from-arraysaslist

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Original file line number	Diff line number	Diff line change
`@@ -22,7 +22,7 @@ public List<List<Integer>> pacificAtlantic(int[][] heights) {`
`22`	`22`	`for (inti =0;i <rows;i++) {`
`23`	`23`	`for (intj =0;j <cols;j++) {`
`24`	`24`	`if (pacific[i][j] &&atlantic[i][j]) {`
`25`		`-res.add(Arrays.asList(i,j));`
	`25`	`+res.add(List.of(i,j));`
`26`	`26`	`}`
`27`	`27`	`}`
`28`	`28`	`}`

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