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Original file line number	Diff line number	Diff line change
`@@ -13,6 +13,8 @@ public static class Solution1 {`
`13`	`13`	`* 2. priority queue doesn't help in this case unless used in combination with a set to filter out duplicates;`
`14`	`14`	`* 3. implement a customized comparator for treeset: if sum i.e. entry[0] doesn't equal, then it's not a duplicate,`
`15`	`15`	`* then we compare the rest of the elements in the array, as long as anyone of them differs at the same index, it's not a duplicate.`
	`16`	`+ *`
	`17`	`+ * Again, using a pen and paper to visualize my thought process helps a lot!`
`16`	`18`	`*/`
`17`	`19`	`publicintkthSmallest(int[][]mat,intk) {`
`18`	`20`	`TreeSet<int[]>treeSet =newTreeSet<>(newComparator<int[]>() {`

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