/***@Author:hhhzzz*@Description:一口井，井深21米，早上爬10米，晚上掉7米，几天能爬出来？*@Date:21:15 /1/28*/class Main{static int result=1;static int sum=0;public static void main(String[] args) {int deep=21;int day=10;int night=7;solution(deep,day,night);System.out.println(result);}public static void solution(int deep,int day,int night){while (true){sum+=day;//白天爬if(sum>=deep){break;}sum-=night;//晚上掉result++;}}}
