In coding tests, a deep understanding of algorithms and data structures is required. In this course, we will explore the features and useful functions of Kotlin while solving an algorithm problem called “Sorting Digits in Descending Order”.<\/p>\n<\/header>\n Reconstruct the number by sorting the digits of a given integer For example:<\/p>\n The first step in solving the problem is to accurately understand the given problem. The input is in the form of an integer, and what we need to do is separate this integer into its digits and sort them in descending order. After sorting the digits, we need to combine them back into an integer and return it.<\/p>\n We can convert the integer into a string to easily access each digit. Each character in the string represents a digit of the original integer, and we can use this to extract the digits.<\/p>\n To sort the digits, we can use Kotlin’s built-in function. We can use the We need to convert the sorted digits back into an integer as our final result. We concatenate each digit to form a single string and then convert it back into an integer to return it.<\/p>\n To test the solution we have written, we will execute each test case.<\/p>\n When the above code is executed, each integer is expected to be printed in descending order as intended.<\/p>\n<\/section>\nProblem Description<\/h2>\n
N<\/code> in descending order. Return the number after sorting the digits. The integer N<\/code> is between 0 and 231<\/sup>-1.<\/p>\n\n
118372<\/code> \u2192 Output: 873211<\/code><\/li>\n2143<\/code> \u2192 Output: 4321<\/code><\/li>\n0<\/code> \u2192 Output: 0<\/code><\/li>\n<\/ul>\n<\/section>\nSolution Process<\/h2>\n
Step 1: Understanding the Problem<\/h3>\n
Step 2: Extracting Each Digit<\/h3>\n
Step 3: Sorting the Digits<\/h3>\n
sortedDescending()<\/code> function to sort the digits in descending order.<\/p>\nStep 4: Combining the Sorted Digits<\/h3>\n
Step 5: Implementing the Final Code<\/h3>\n
\nfun solution(N: Int): Int {\n \/\/ Convert integer N to string\n val strN = N.toString()\n \n \/\/ Sort the digits in descending order\n val sortedDigits = strN.toCharArray().sortedDescending()\n \n \/\/ Combine the sorted digits back into a single string\n val resultStr = sortedDigits.joinToString(\"\")\n \n \/\/ Convert string to integer and return\n return resultStr.toInt()\n}\n <\/code><\/pre>\n<\/section>\nExample Test<\/h2>\n
\nfun main() {\n println(solution(118372)) \/\/ 873211\n println(solution(2143)) \/\/ 4321\n println(solution(0)) \/\/ 0\n}\n <\/code><\/pre>\nTime Complexity and Space Complexity<\/h2>\n