解题思路:
注意事项:
参考代码:
import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int n = scanner.nextInt(); int count = 0; for (int i = 1; i <= n; i++) { String box = Integer.toString(i);//转换为字符串 for (int j = 0; j < box.length(); j++) {//然后遍历查看是否有为1的数字 int distinguish = box.charAt(j)-'0'; if (distinguish == 1) { count++; } } } System.out.println(count); } }
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