Find the Duplicate Number Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exist. Assume that there is only one duplicate number, find the duplicate one. Note: You must not modify the array (as...
题目:Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exis
Java Solution: Runtime beats 51.39% 完成日期:09/14/2017 关键词:Array, Two Pointers 关键点:快慢指针相遇的点就是重复的数字 1classSolution2{3publicintfindDuplicate(int[] nums)4{5/*Solution 2:*/6intslow = 0, fast = 0;7//fist meeting8do9{10slow = nums[slow];//slow takes one step e...
We start with splitting the string and collecting all words in aList. Then we use theHashSet.add()method to check if the word is unique or duplicate. List<String>wordsList=Arrays.asList(sentence.split(" "));Set<String>tempSet=newHashSet<>();List<String>duplicateWords=newArrayList<>();...
这里的duplicate number就是cycle的起点. 课通过快慢指针找到cycle的起点. Note: 这里回置walker是回置到0. 而不是nums[0]. 因为接下来是跳动nums[runner], runner 是index. Time Complexity: O(n). Space: O(1). AC Java: 1publicclassSolution {2publicintfindDuplicate(int[] nums) {3if(nums ==null...
3. Prior to Java 8 In our first idea to solve the problem, weinitialize an emptyHashMap<V, Set<K>>and populate it using in a classic for-each loop: static <K, V> Map<V, Set<K>> transformMap(Map<K, V> input) { Map<V, Set<K>> resultMap = new HashMap<>(); ...
Write a Java program to count the number of duplicate values in an integer array. Write a Java program to remove all duplicate values from an integer array. Write a Java program to find the most frequently occurring number in an array. Write a Java program to return a list of unique ...
1. Using Plain Java Let us start with writing the program logic ourselves. In this solution, we are creatingMapwhere each unique character in the string is theMapkey, and the number of occurrences of the character is stored as the value. ...
In this example, we grouped the Name, Department and counted the number of records of each record. If the count of any record is greater than one, we return the name, Department and count of that record. Using Self Joins We can also join the table with itself to find the duplicate rec...
- Use a subquery in the WHERE clause. - Within the subquery, each row of a result set will have a unique integer value assigned by the ROW_NUMBER() function. - Subquery will return the duplicate records except for the first row.