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Commit532fba0

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add 1429
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‎README.md

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@@ -298,6 +298,7 @@ _If you like this project, please leave me a star._ ★
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|1436|[Destination City](https://leetcode.com/problems/destination-city/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1436.java)||Easy|String|
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|1432|[Max Difference You Can Get From Changing an Integer](https://leetcode.com/problems/max-difference-you-can-get-from-changing-an-integer/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1432.java)||Medium|String|
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|1431|[Kids With the Greatest Number of Candies](https://leetcode.com/problems/kids-with-the-greatest-number-of-candies/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1431.java),[C++](../master/cpp/_1431.cpp)||Easy|Array|
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|1429|[First Unique Number](https://leetcode.com/problems/first-unique-number/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1429.java)||Medium|Array, HashTable, Design, Data Streams|
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|1428|[Leftmost Column with at Least a One](https://leetcode.com/problems/leftmost-column-with-at-least-a-one/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1428.java)||Medium|Array|
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|1427|[Perform String Shifts](https://leetcode.com/problems/perform-string-shifts/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1427.java)||Easy|Array, Math|
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|1426|[Counting Elements](https://leetcode.com/problems/counting-elements/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1426.java)||Easy|Array|
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packagecom.fishercoder.solutions;
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importjava.util.HashSet;
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importjava.util.LinkedHashSet;
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importjava.util.Set;
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publicclass_1429 {
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publicstaticclassSolution1 {
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/**
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* Credit: https://leetcode.com/problems/first-unique-number/discuss/602698/Java-Easy-Set-O(1)
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* <p>
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* LinkedHashSet is a handy data structure to help preserve the order of all unique elements.
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*/
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publicstaticclassFirstUnique {
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Set<Integer>uniqSet;
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Set<Integer>nonUniqSet;
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publicFirstUnique(int[]nums) {
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uniqSet =newLinkedHashSet<>();
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nonUniqSet =newHashSet<>();
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for (intnum :nums) {
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add(num);
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}
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}
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publicintshowFirstUnique() {
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if (!uniqSet.isEmpty()) {
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returnuniqSet.iterator().next();
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}
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return -1;
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}
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publicvoidadd(intvalue) {
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if (uniqSet.contains(value)) {
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uniqSet.remove(value);
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nonUniqSet.add(value);
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}
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if (!nonUniqSet.contains(value)) {
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uniqSet.add(value);
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}
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}
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}
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}
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}

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