Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, /. Each operand may be an integer or another expression. Some examples: ["2", "1", "+", "3", "*"] -&g
题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1394 Minimum Inversion Number Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 10
Life is a Line Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 131072/65536 K (Java/Others)Total Submission(s): 1927 Accepted Submission(s): 471 Problem Description There is a saying: Life is like a line, some people are your parallel line
Ping pong Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 3109 Accepted: 1148 Description N(3<=N<=20000) ping pong players live along a west-east street(consider the street as a line segment). Each player has a unique skill rank. To i