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Original file line number	Diff line number	Diff line change
`@@ -27,6 +27,7 @@`
`27`	`27`	`publicclassSolutionTwo {`
`28`	`28`
`29`	`29`	`// reduce to only two versions left and then make the judgment.`
	`30`	`+// invariant: if bad version exists, it is within [left : right]`
`30`	`31`	`publicintfirstBadVersion(intn) {`
`31`	`32`	`intleft =1;`
`32`	`33`	`intright =n;`

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