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add a solution for 997

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Original file line number	Diff line number	Diff line change
`@@ -25,6 +25,9 @@ public int findJudge(int n, int[][] trust) {`
`25`	`25`	`publicstaticclassSolution2 {`
`26`	`26`	`/**`
`27`	`27`	`* Credit: https://leetcode.com/problems/find-the-town-judge/solution/ solution 2`
	`28`	`+ * Also, note: is it possible to have more than one town judges?`
	`29`	`+ * No! It's impossible! If it's possible, suppose there are two town judges, then both of them have to be trusted by everyone else which includes the other judge.`
	`30`	`+ * Otherwise, we'ld have a town judge not trusted by everybody.`
`28`	`31`	`*/`
`29`	`32`	`publicintfindJudge(intn,int[][]trust) {`
`30`	`33`	`if (trust.length <n -1) {`

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