题解 | 挑7
挑7
https://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
import java.util.Scanner; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); while(scanner.hasNext()) { int maxInt = scanner.nextInt(); int count = 0; for(int i = 7; i <= maxInt; i ++) { if(i % 7 == 0) { count ++; }else if(String.valueOf(i).contains("7")) { count ++; } } System.out.println(count); } } }