ACM--steps--dyx--2.3.7--下沙的沙子有几粒？下沙的沙子有几粒？
下沙的沙子有几粒？Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 921 Accepted Submission(s): 526 Problem Description2
