remove all the same elements

本文介绍了一种用于从序列中高效删除指定元素的算法。通过遍历序列并使用循环,该算法能够识别并移除所有与目标值相等的元素。在处理过程中,通过元素的前移操作实现删除,同时维护序列的长度。若未找到要删除的元素,则会输出相应的提示信息。
int remove(type x)
{
    int size = currentsize;    //currentsize 为序列中元素个数
    for(int i = 0; i < currentsize; )
    {
        if(elements[i] == x)
            {
                for(int j = i; j < currentsize; j++)
                    elements[j] = elements[j + 1]; //将i后的元素前移一位
                currentsize--;  
                continue;    //删除i后所有与x相等的元素
            }
        i++;
    }
    if(size == currentsize)
    {
        cout << "can't find the element you want to remove!" << endl;
        return 0;
    }
    return 1;
}
C. Need More Arrays time limit per test2 seconds memory limit per test256 megabytes Given an array a and n integers. It is sorted in non-decreasing order, that is, ai≤ai+1 for all 1≤i<n . You can remove any number of elements from the array (including the option of not removing any at all) without changing the order of the remaining elements. After the removals, the following will occur: a1 is written to a new array; if a1+1<a2 , then a2 is written to a new array; otherwise, a2 is written to the same array as a1 ; if a2+1<a3 , then a3 is written to a new array; otherwise, a3 is written to the same array as a2 ; ⋯ For example, if a=[1,2,4,6] , then: a1=1 is written to the new array, resulting in arrays: [1] ; a1+1=2 , so a2=2 is added to the existing array, resulting in arrays: [1,2] ; a2+1=3 , so a3=4 is written to a new array, resulting in arrays: [1,2] and [4] ; a3+1=5 , so a4=6 is written to a new array, resulting in arrays: [1,2] , [4] , and [6] . Your task is to remove elements in such a way that the described algorithm creates as many arrays as possible. If you remove all elements from the array, no new arrays will be created. Input The first line of input contains one integer t (1≤t≤104 ) — the number of test cases. The first line of each test case contains one integer n (1≤n≤2⋅105 ) — the length of the array. The second line of each test case contains n integers a1,a2,…,an (1≤ai≤106 , ai≤ai+1 ) — the elements of the array. It is guaranteed that the sum of n across all test cases does not exceed 2⋅105 . Output For each test case, output one integer — the maximum number of arrays that can be obtained by removing any (possibly zero) number of elements. Example InputCopy 6 6 1 2 3 4 5 6 3 1 2 3 4 1 2 2 4 1 2 3 1 4 8 2 1 1 OutputCopy 3 2 2 1 3 1 Note In the first example, you can remove a3 and a5 , then a=[1,2,4,6] , the process of forming arrays for it is shown in the statement. In the second example, you need to remove a2 , after which a=[1,3] , and the arrays [1] and [3] will be written. In the third example, no removals are needed; for a=[1,2,2,4] , the arrays [1,2,2] and [4] will be written.用c++
05-27
There is a sequence A. Initially, A=(0). (That is, A is a sequence of length 1 containing 0 as its only element). You are given Q queries to process in order. The i-th query (1≤i≤Q) has one of the following forms: 1 x: Insert i immediately after the location where x appears in A. Specifically, let A j ​ be the j-th element of the current A and n be the length of A. For p such that A p ​ =x, update A to (A 1 ​ ,…,A p ​ ,i,A p+1 ​ ,…,A n ​ ). It is guaranteed that A contains x immediately before processing this query. 2 x y: Remove all elements between x and y in A, and output the sum of the values of the removed elements. Specifically, let A j ​ be the j-th element of the current A and n be the length of A. For p and q such that A p ​ =x and A q ​ =y, output A min(p,q)+1 ​ +⋯+A max(p,q)−1 ​ and update A to (A 1 ​ ,…,A min(p,q) ​ ,A max(p,q) ​ ,…,A n ​ ). It is guaranteed that A contains both x and y immediately before processing this query. Note that for any sequence of queries, the same value never appears multiple times in A during the process of handling queries, and thus the position where a value appears in A is unique (if it exists). Constraints 1≤Q≤5×10 5 For the i-th query: If it is a type 1 query: 0≤x<i A contains x immediately before processing the query. If it is a type 2 query: 0≤x<y<i A contains both x and y immediately before processing the query. All input values are integers. Input The input is given from Standard Input in the following format: Q query 1 ​ query 2 ​ ⋮ query Q ​ Here, query i ​ represents the i-th query and is given in one of the following forms: 1 x 2 x y Output Let q be the number of type 2 queries. Output q lines. The i-th line should contain the value to be output for the i-th type 2 query. Sample Input 1 Copy 6 1 0 1 1 1 0 2 2 3 1 2 2 0 5 Sample Output 1 Copy 1 5 Initially, A=(0). 1st query: Insert 1 immediately after 0. A becomes (0,1). 2nd query: Insert 2 immediately after 1. A becomes (0,1,2). 3rd query: Insert 3 immediately after 0. A becomes (0,3,1,2). 4th query: Remove the elements between 2 and 3, namely 1, and output the sum of the removed values, which is 1. A becomes (0,3,2). 5th query: Insert 5 immediately after 2. A becomes (0,3,2,5). 6th query: Remove the elements between 0 and 5, namely 3,2, and output the sum of the removed values, which is 5. A becomes (0,5). Sample Input 2 Copy 2 1 0 2 0 1 Sample Output 2 Copy 0 In the 2nd query, we remove all elements between 0 and 1, but there are actually no such elements, so no elements are removed and the output value is 0. Sample Input 3 Copy 10 1 0 1 1 2 0 2 2 0 2 1 0 1 5 2 0 5 2 2 6 1 6 1 9 Sample Output 3 Copy 1 0 0 0
08-31
Objectives of this Assignment 1. Declare arrays of different types dynamically. 2. Iterate through arrays, processing all of the elements. 3. Write methods with arrays as parameters and return values In this assignment you will create your own class and write the methods in it. The class you write is called Main and it has four methods that build arrays and four methods that process arrays. All methods should be public and static. Create a project called P7_3 and a class named Main in a file calledMain.java, then follow the instructions below exactly: 1. Write a method named createStrings that takes a String as an input parameter, and returns an array of string with 4 elements. The first element is the original string passed in, the second element is the same string converted to uppercase, the third element is the same string converted to lowercase, and the fourth element is the same string with the first character removed. 2. Write a method called charFrequency that takes an array of strings and a single character as parameters. The method should iterate the array, counting instances of the character passed in. For example, if the array is ["Hello", "There"] and we are asked to count the character 'e', the return value will be three. If the character is not found in any of the elements in the array, the return value should be zero. 3.Add a main method with the usual signature that instantiates the Main class and tests its methods as follow: public static void main(String[] args) { Scanner in = new Scanner(System.in); String str = in.nextLine(); char ch = in.next().charAt(0); // Create arrays String[] stringArray = createStrings(str); // Test processing System.out.println(charFrequency(stringArray, ch)); in.close(); } Input Specification: There are two lines in the input. The first line is the string to be converted. The second line contains one character to be counted. Output Specification: For each case, output the frequency of the specified character in the created array. Sample Input: Hello There e Sample Output: 在这里给出相应的输出。例如: 9
03-10
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