\n This is a problem of creating a new integer by sorting the digits of a given integer in descending order. \n An integer N (0 \u2264 N \u2264 2,147,483,647) is given in the first line.\n <\/p>\n \n Output a new integer by sorting the digits of integer N in descending order.\n <\/p>\n \n To solve this problem, several steps must be followed. \n First, we need to receive an integer input. \n After converting the input integer to a character array, we can separate each digit individually. \n After separating the digits, they need to be sorted in descending order. \n After sorting the digits, convert them back to a string and then to an integer to obtain the final result. \n When the above code is executed, you can see the result of sorting the digits of the input integer in descending order. \n To solve this problem, exceptional situations must also be considered. \n In this lesson, we learned how to solve an algorithm problem that involves sorting digits in descending order. <\/body><\/p>\n","protected":false},"excerpt":{"rendered":"
\n For example, if the given integer is 4213<\/strong>, the result after sorting the digits in descending order is 4321<\/strong>.
\n This type of problem is commonly encountered in C++ coding tests, and it tests the ability to solve problems based on an understanding of sorting algorithms.\n <\/p>\nProblem Input<\/h2>\n
Problem Output<\/h2>\n
Input Example<\/h2>\n
4213<\/code><\/pre>\nOutput Example<\/h2>\n
4321<\/code><\/pre>\nSolution Process<\/h2>\n
\n The main steps are as follows.\n <\/p>\n1. Input<\/h3>\n
\n In C++, we can use cin<\/code> to take input from the user.
\n The received integer will later be converted to a character type for the purpose of separating the digits.\n <\/p>\n2. Digit Separation<\/h3>\n
\n In C++, the to_string<\/code> function can be used to convert an integer to a string.
\n Each character of the converted string can be stored in a vector.\n <\/p>\n3. Descending Sort<\/h3>\n
\n The sort<\/code> function in C++ can be used, and a comparison function can be applied to perform the descending sort.
\n Specifically, since the digits are sorted as characters, the ASCII values of the numbers must be considered during sorting.\n <\/p>\n4. Integer Conversion<\/h3>\n
\n Finally, use cout<\/code> to display the result.\n <\/p>\nCode Example<\/h3>\n
\n#include <iostream>\n#include <vector>\n#include <algorithm>\n#include <string>\n\nusing namespace std;\n\nint main() {\n \/\/ 1. Input\n int N;\n cin >> N;\n\n \/\/ 2. Digit Separation\n string str = to_string(N);\n vectorResult<\/h2>\n
\n For example, when 4213<\/strong> is inputted, the output will show 4321<\/strong>.\n <\/p>\nException Handling<\/h2>\n
\n For instance, if the input value is 0, the output should also be 0.
\n Therefore, when writing the code, handling these exceptional situations should also be added.\n <\/p>\nException Handling Code Example<\/h3>\n
\n#include <iostream>\n#include <vector>\n#include <algorithm>\n#include <string>\n\nusing namespace std;\n\nint main() {\n \/\/ 1. Input\n int N;\n cin >> N;\n\n \/\/ 0 Exception Handling\n if (N == 0) {\n cout << 0 << endl;\n return 0;\n }\n\n \/\/ 2. Digit Separation\n string str = to_string(N);\n vectorConclusion<\/h2>\n
\n We were able to solve the problem by using basic input\/output and data structures in C++.
\n Problems of this type greatly aid in developing basic algorithmic skills.
\n Similar logic can be applied to other problems, so I hope you will practice by solving a variety of problems to improve your skills.\n <\/p>\n