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 sc = new Scanner(System.in); int n = sc.nextInt(); int count = 0; for(int i=1; i<=n; i++){ if(String.valueOf(i).contains("7")) count++; else if(i%7 == 0) count++; } System.out.println(count); } }