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refactor 56

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Original file line number	Diff line number	Diff line change
`@@ -12,7 +12,7 @@ public static class Solution1 {`
`12`	`12`	`*/`
`13`	`13`	`publicint[][]merge(int[][]intervals) {`
`14`	`14`	`List<int[]>list =newArrayList<>();`
`15`		`-Arrays.sort(intervals, (a,b) ->a[0] !=b[0] ?a[0] -b[0] :a[1] -b[1]);`
	`15`	`+Arrays.sort(intervals, (a,b) ->Integer.compare(a[0],b[0]));//to avoid integer subtraction overflow`
`16`	`16`	`for (inti =0;i <intervals.length;i++) {`
`17`	`17`	`intstart =intervals[i][0];`
`18`	`18`	`intend =intervals[i][1];`

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