摘要： http://acm.hdu.edu.cn/showproblem.php?pid=1532Drainage DitchesTime Limit: 2000/1000 MS (Java/Others)Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 3290Accepted Submission(s): 1526Problem DescriptionEvery time it rains on Farmer John's fields, a pond forms over Bessie's favorit 阅读全文