Write a javascript functionGiven an array of integers, find the one that appears an odd number of times. There will always be only one integer that appears an odd number of times.

时间: 2024-01-03 09:06:05 浏览: 84
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Given an array of integers, return indices of the two numbers

Sure, here's a JavaScript function that solves the problem you described: ```javascript function findOdd(arr) { let result = 0; for (let i = 0; i < arr.length; i++) { result ^= arr[i]; } return result; } ``` This function uses the XOR (^) operator to find the integer that appears an odd number of times. The XOR operator returns a 1 in each bit position for which the corresponding bits of either but not both operands are 1s. By XORing all the integers in the array together, we end up with the integer that appears an odd number of times.
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Write a javascript function,Given an array of integers, find the one that appears an odd number of times. There will always be only one integer that appears an odd number of times. Examples [7] should return 7, because it occurs 1 time (which is odd). [0] should return 0, because it occurs 1 time (which is odd). [1,1,2] should return 2, because it occurs 1 time (which is odd). [0,1,0,1,0] should return 0, because it occurs 3 times (which is odd). [1,2,2,3,3,3,4,3,3,3,2,2,1] should return 4, because it appears 1 time (which is odd).

Sure, here's a JavaScript function that solves the problem you described with the given examples: ... We then loop through the object and return the integer that appears an odd number of times.

For an array of integers [a1,a2,…,an], let's call the value |a1−a2|+|a2−a3|+⋯+|an−1−an| the contrast of the array. Note that the contrast of an array of size 1 is equal to 0 . You are given an array of integers a . Your task is to build an array of b in such a way that all the following conditions are met: b is not empty, i.e there is at least one element; b is a subsequence of a, i.e b can be produced by deleting some elements from a (maybe zero); the contrast of b is equal to the contrast of a . What is the minimum possible size of the array b ? Input The first line contains a single integer t (1≤t≤104 ) — the number of test cases. The first line of each test case contains a single integer n (1≤n≤3⋅105) — the size of the array a . The second line contains n integers a1,a2,⋅,an (0≤ai≤109 ) — elements of the array itself. The sum of n over all test cases doesn't exceed 3⋅105.

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You are given a permutation† a of length n . Find any permutation b of length n such that a1+b1≤a2+b2≤a3+b3≤…≤an+bn . It can be proven that a permutation b that satisfies the condition above always exists. † A permutation of length n is an array consisting of n distinct integers from 1 to n in arbitrary order. For example, [2,3,1,5,4] is a permutation, but [1,2,2] is not a permutation (2 appears twice in the array), and [1,3,4] is also not a permutation (n=3 but there is 4 in the array). Input Each test contains multiple test cases. The first line of input contains a single integer t (1≤t≤2000 ) — the number of test cases. The description of test cases follows. The first line of each test case contains a single integer n (1≤n≤100 ) — the length of permutations a and b . The second line of each test case contains n distinct integers a1,a2,…,an (1≤ai≤n ) — the elements of permutation a . All elements of a are distinct. Note that there is no bound on the sum of n over all test cases. Output For each test case, output any permutation b which satisfies the constraints mentioned in the statement. It can be proven that a permutation b that satisfies the condition above always exists.

给定一个长度为 n 的排列 a，找到任意一个长度为 n 的排列 b，使得 a1+b1≤a2+b2≤a3+b3≤…≤an+bn。可以证明，满足上述条件的排列 b 总是存在的。 输入： 第一行输入一个整数 t，表示测试数据组数。 接下来 t ...

用C++写You are given two integers x and k . Grasshopper starts in a point 0 on an OX axis. In one move, it can jump some integer distance, that is not divisible by k , to the left or to the right. What's the smallest number of moves it takes the grasshopper to reach point x ? What are these moves? If there are multiple answers, print any of them. Input The first line contains a single integer t (1≤t≤1000 ) — the number of testcases. The only line of each testcase contains two integers x and k (1≤x≤100 ; 2≤k≤100 ) — the endpoint and the constraint on the jumps, respectively. Output For each testcase, in the first line, print a single integer n — the smallest number of moves it takes the grasshopper to reach point x . In the second line, print n integers, each of them not divisible by k . A positive integer would mean jumping to the right, a negative integer would mean jumping to the left. The endpoint after the jumps should be exactly x . Each jump distance should be from −109 to 109 . In can be shown that, for any solution with the smallest number of jumps, there exists a solution with the same number of jumps such that each jump is from −109 to 109 . It can be shown that the answer always exists under the given constraints. If there are multiple answers, print any of them.

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You are given two arrays a and b both of length n. You will merge† these arrays forming another array c of length 2⋅n. You have to find the maximum length of a subarray consisting of equal values across all arrays c that could be obtained. † A merge of two arrays results in an array c composed by successively taking the first element of either array (as long as that array is nonempty) and removing it. After this step, the element is appended to the back of c. We repeat this operation as long as we can (i.e. at least one array is nonempty). Input Each test contains multiple test cases. The first line of input contains a single integer t (1≤t≤104) — the number of test cases. The description of test cases follows. The first line of each test case contains a single integer n (1≤n≤2⋅105) — the length of the array a and b. The second line of each test case contains n integers a1,a2,…,an (1≤ai≤2⋅n) — the elements of array a. The third line of each test case contains n integers b1,b2,…,bn (1≤bi≤2⋅n) — the elements of array b. It is guaranteed that the sum of n across all test cases does not exceed 2⋅105. Output For each test case, output the maximum length of a subarray consisting of equal values across all merges. c++实现

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Let 𝑃 be a set of 𝑛 points on the 𝑥-axis and each of the points is colored with one of the colors 1,2, . . . , 𝑘. For each color 𝑖 of the 𝑘 colors, there is at least one point in 𝑃 which is colored with 𝑖. For a set 𝑃 ′ of consecutive points from 𝑃, if both 𝑃 ′ and 𝑃 ∖ 𝑃 ′ contain at least one point of each color, then we say that 𝑃 ′ makes a double rainbow. See the below figure as an example. The set 𝑃 consists of ten points and each of the points is colored by one of the colors 1, 2, 3, and 4. The set 𝑃 ′ of the five consecutive points contained in the rectangle makes a double rainbow. Given a set 𝑃 of points and the number 𝑘 of colors as input, write a program that computes and prints out the minimum size of 𝑃 ′ that makes a double rainbow. Input Your program is to read from standard input. The input starts with a line containing two integers 𝑛 and 𝑘 (1 ≤ 𝑘 ≤ 𝑛 ≤ 10,000), where 𝑛 is the number of the points in 𝑃 and 𝑘 is the number of the colors. Each of the following 𝑛 lines consists of an integer from 1 to 𝑘, inclusively, and the 𝑖-th line corresponds to the color of the 𝑖-th point of 𝑃 from the left. Output Your program is to write to standard output. Print exactly one line. The line should contain the minimum size of 𝑃 ′ that makes a double rainbow. If there is no such 𝑃 ′ , print 0. The following shows sample input and output for two test cases.

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写出这个题的代码：You are given an unsorted permutation p1,p2,…,pn. To sort the permutation, you choose a constant k (k≥1) and do some operations on the permutation. In one operation, you can choose two integers i, j (1≤j<i≤n) such that i−j=k, then swap pi and pj. What is the maximum value of k that you can choose to sort the given permutation? A permutation is an array consisting of n distinct integers from 1 to n in arbitrary order. For example, [2,3,1,5,4] is a permutation, but [1,2,2] is not a permutation (2 appears twice in the array) and [1,3,4] is also not a permutation (n=3 but there is 4 in the array). An unsorted permutation p is a permutation such that there is at least one position i that satisfies pi≠i. Input Each test contains multiple test cases. The first line contains the number of test cases t (1≤t≤104). The description of the test cases follows. The first line of each test case contains a single integer n (2≤n≤105) — the length of the permutation p. The second line of each test case contains n distinct integers p1,p2,…,pn (1≤pi≤n) — the permutation p. It is guaranteed that the given numbers form a permutation of length n and the given permutation is unsorted. It is guaranteed that the sum of n over all test cases does not exceed 2⋅105. Output For each test case, output the maximum value of k that you can choose to sort the given permutation. We can show that an answer always exists.

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Jonathan is fighting against DIO's Vampire minions. There are n of them with strengths a1,a2,…,an. Denote (l,r) as the group consisting of the vampires with indices from l to r. Jonathan realizes that the strength of any such group is in its weakest link, that is, the bitwise AND. More formally, the strength level of the group (l,r) is defined as f(l,r)=al&al+1&al+2&…&ar. Here, & denotes the bitwise AND operation. Because Jonathan would like to defeat the vampire minions fast, he will divide the vampires into contiguous groups, such that each vampire is in exactly one group, and the sum of strengths of the groups is minimized. Among all ways to divide the vampires, he would like to find the way with the maximum number of groups. Given the strengths of each of the n vampires, find the maximum number of groups among all possible ways to divide the vampires with the smallest sum of strengths. Input The first line contains a single integer t (1≤t≤104) — the number of test cases. The description of test cases follows. The first line of each test case contains a single integer n (1≤n≤2⋅105) — the number of vampires. The second line of each test case contains n integers a1,a2,…,an (0≤ai≤109) — the individual strength of each vampire. The sum of n over all test cases does not exceed 2⋅105. Output For each test case, output a single integer — the maximum number of groups among all possible ways to divide the vampires with the smallest sum of strengths.c++实现

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