https://leetcode-cn.com/problems/unique-number-of-occurrences/耗时解题:22 min 题解:4 min题意给你一个整数数组 arr,请你帮忙统计数组中每个数的出现次数。如果每个数的出现次数都是独一无二的,就返回 true;否则返回 false。思路两个哈希表,一个用来离散统计出现次数,第二个测试出现次数是否独一无二。
LeetCode.1207-唯一的元素出现次数(Unique Number of Occurrences) 这是小川的第419次更新,第452篇原创 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第269题(顺位题号是1207)。给定一个整数数组arr,当且仅当该数组中每个元素的出现次数唯一时,返回true。 例如: 输入:arr = [1,2,2,1,1,3] 输出:...
第二次计数,同样声明一个长度为2001的int数组count2,如果count中的当前元素不等于0,就将当前元素作为count2数组的索引,元素值累加,加完后判断元素值是否大于等于2,如果大于,直接返回false。 publicbooleanuniqueOccurrences2(int[] arr){int[] count =newint[2001];for(intnum : arr) { count[num+1000]++; }...
1typedeflonglongll;2#define_for(i,a,b) for(int i = (a);i < b;i ++)3#define_rep(i,a,b) for(int i = (a);i > b;i --)4#defineINF 0x3f3f3f3f5#definepb push_back6#definemaxn 1000078classSolution9{10public:11booluniqueOccurrences(vector<int>&arr)12{13intHash[2003];14mem...
Explanation: The value 1 has 3 occurrences, 2 has 2 and 3 has 1. No two values have the same number of occurrences. 1. 2. 3. Example 2: Input: arr = [1,2] Output: false 1. 2. Example 3: Input: arr = [-3,0,1,-3,1,1,1,-3,10,0] ...
Can you solve this real interview question? Unique Number of Occurrences - Given an array of integers arr, return true if the number of occurrences of each value in the array is unique or false otherwise. Example 1: Input: arr = [1,2,2,1,1,3] Outpu
- This is a modal window. No compatible source was found for this media. Finding number of occurrences of the element appearing most number of times in JavaScript Occurrences After Bigram in Python Python Program to Find the Number of Unique Words in Text File ...
function to find the number of occurrences of each unique ID in your table. Here's how you can do it:
0980-Unique-Paths-III cpp-0980 CMakeLists.txt main.cpp java-0980 0981-Time-Based-Key-Value-Store 0982-Triples-with-Bitwise-AND-Equal-To-Zero 0983-Minimum-Cost-For-Tickets 0984-String-Without-AAA-or-BBB 0985-Sum-of-Even-Numbers-After-Queries 0986-Interval-List-Intersec...
1207. Unique Number of Occurrences* https://leetcode.com/problems/unique-number-of-occurrences/ 题目描述 Given an array of integers arr, write a function that returns true if and only if the number of occurrences of each value in the array is...