If the sum of the digits is less than or equal to 10, consider it a ‘good number’ and print it.<\/li>\n<\/ul>\n3.1. Calculating the Sum of Digits<\/h3>\n
\n To calculate the sum of the digits, you can use the method of dividing the number by 10 and obtaining the remainder. For example, when dividing 23, you get 3 (23 % 10) and 2 (23 \/ 10).
\n By following this process, you can identify the digits of each number and calculate the sum.\n <\/p>\n
4. Code Implementation<\/h2>\n
\n Now, let’s write C++ code based on the above approach. Below is the code for the program that finds ‘good numbers’.\n <\/p>\n
\n#include \nusing namespace std;\n\nbool isGoodNumber(int number) {\n int sum = 0;\n while (number > 0) {\n sum += number % 10; \/\/ Adding the current digit\n number \/= 10; \/\/ Calculating the next digit\n }\n return sum <= 10; \/\/ Check if the sum of digits is less than or equal to 10\n}\n\nint main() {\n int n;\n cout << \"Please enter an integer: \";\n cin >> n;\n\n cout << \"Good numbers: \";\n for (int i = 1; i <= n; i++) {\n if (isGoodNumber(i)) {\n cout << i << \" \"; \/\/ Print good number\n }\n }\n cout << endl;\n return 0;\n}\n <\/iostream><\/code><\/pre>\n5. Code Explanation<\/h2>\n
\n The above code is a simple program, consisting of the isGoodNumber<\/code> function to determine ‘good numbers’ and the main function main<\/code>.\n <\/p>\n5.1. isGoodNumber Function<\/h3>\n
\n This function takes an integer as input, calculates the sum of its digits, and returns true or false based on the result.
\n It uses a loop to separate and sum each digit of the number.\n <\/p>\n
5.2. Main Function<\/h3>\n
\n In the main function, the user inputs n, and it checks numbers from 1 to n. It calls isGoodNumber<\/code> for each number to determine if it is a good number.\n <\/p>\n6. Time Complexity<\/h2>\n
\n The time complexity of this algorithm is O(d * n), where d is the number of digits in n.
\n Summing the digits for each number is performed at most 4 times, allowing it to handle larger n values in real-time.\n <\/p>\n
7. Optimization<\/h2>\n
\n The current code may be inefficient as it considers all numbers and calculates the sum of digits.
\n Instead, you can pre-calculate and store the sum of digits to reduce redundant calculations. Here is an example of code improvement for this.\n <\/p>\n
\n#include \n#include \nusing namespace std;\n\nvector precomputeGoodNumbers(int maxNum) {\n vector goodNumbers;\n for (int i = 1; i <= maxNum; i++) {\n if (isGoodNumber(i)) {\n goodNumbers.push_back(i); \/\/ Store good numbers\n }\n }\n return goodNumbers;\n}\n\nint main() {\n int n;\n cout << \"Please enter an integer: \";\n cin >> n;\n\n vector goodNumbers = precomputeGoodNumbers(n);\n cout << \"Good numbers: \";\n for (int number : goodNumbers) {\n cout << number << \" \"; \/\/ Print pre-stored good numbers\n }\n cout << endl;\n return 0;\n}\n <\/int><\/int><\/int><\/vector><\/iostream><\/code><\/pre>\n8. Conclusion<\/h2>\n
\n Today, we explored the problem of finding ‘good numbers’. This problem is a great example of developing basic algorithmic thinking and improving problem-solving skills.
\n Continue to strengthen your algorithmic skills through various problems. Happy coding!\n <\/p>\n
<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"
1. Introduction Solving algorithm problems is a very important factor in job preparation. Today, we will take a deep dive into the ‘good number’ problem that many developers face. A ‘good number’ refers to a number that meets certain conditions, and through this problem, you can enhance your thinking skills and improve your abilities. 2. … \ub354 \ubcf4\uae30 “C++ Coding Test Course, ‘Finding Good Numbers’”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[111],"tags":[],"class_list":["post-34120","post","type-post","status-publish","format-standard","hentry","category-c-coding-test-tutorials-2"],"yoast_head":"\nC++ Coding Test Course, 'Finding Good Numbers' - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/atmokpo.com\/w\/34120\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C++ Coding Test Course, 'Finding Good Numbers' - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"og:description\" content=\"1. 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