hihoCoder #1057 : Performance Log

题目地址：http://hihocoder.com/problemset/problem/1057

时间限制:8000ms

单点时限:1000ms

内存限制:256MB

描述

You are given a txt file, which is performance logs of a single-threaded program.

Each line has three columns as follow:

[Function Name] [TimeStamp] [Action]

[FunctionName] is a string of length between 1~255

[TimeStamp] format is hh:mm:ss

Valid values for "Action" column are START or END, marking the start or end of a function call.

Each function will only be called once.

Output the depth-first traversal result of the call graph with the total time of each function call. However, sometimes the performance log isn't correct and at that time you just need to output "Incorrect performance log".

输入

The input only contains 1 case, first line is a positive number N representing the number of logs(1 <= N <= 20000), then there are N lines in next, each line is the log info containing [Function Name] [TimeStamp] [Action], [Function Name] is a string, you can assume the [Function Name] is distinct and the length between 1~255.

输出

Output the depth-first traversal result of the call graph with the total time of each function call for the correct performance, or output "Incorrect performance log".

提示

A call graph is a directed graph that represents calling relationships between subroutines in a computer program.

Call graph for the sample input is shown as below:

Another sample test case.

Sample InputSample Output8
FuncA 00:00:01 START
FuncB 00:00:02 START
FuncC 00:00:03 START
FuncA 00:00:04 END
FuncB 00:00:05 END
FuncD 00:00:06 START
FuncD 00:00:07 END
FuncC 00:00:08 ENDIncorrect performance log

样例输入

8FuncA 00:00:01 STARTFuncB 00:00:02 STARTFuncC 00:00:03 STARTFuncC 00:00:04 ENDFuncB 00:00:05 ENDFuncD 00:00:06 STARTFuncD 00:00:07 ENDFuncA 00:00:08 END

样例输出

FuncA 00:00:07FuncB 00:00:03FuncC 00:00:01FuncD 00:00:01

Java 代码如下：

import java.util.HashMap;import java.util.Map;import java.util.Scanner;import java.util.Stack;public class Main {public static void main(String[] args) {Scanner in=new Scanner(System.in);int n=in.nextInt();Stack<String> st=new Stack<String>();Map<String,myTime> map=new HashMap<String,myTime>();String[] s=new String[n+2];int smk=0,flag=0;while(n-->0){String name=in.next();String ts=in.next();String ac=in.next();if(ac.equals("START")){if(map.containsKey(name)){flag=1;}else{ //未包括map.put(name, new myTime(ts));st.push(name);s[smk++]=name;}}else if(ac.equals("END")){myTime mm=new myTime(ts);if(name.equals(st.peek())&&mm.compare(map.get(name))){myTime temp=map.get(name);map.remove(name);map.put(name, mm.sub(temp));st.pop();}else{flag=1;}}}if(flag==1||!st.isEmpty()){System.out.println("Incorrect performance log");}else{for(int i=0;i<smk;i++){System.out.println(s[i]+" "+map.get(s[i]).toString());}}}}class myTime{private int second;private int minute;private int hour;public  myTime(String s) {second=(int)s.charAt(7)-48+((int)s.charAt(6)-48)*10;minute=(int)s.charAt(4)-48+((int)s.charAt(3)-48)*10;hour=(int)s.charAt(1)-48+((int)s.charAt(0)-48)*10;}public  myTime(int h,int m,int s) {second=s;minute=m;hour=h;}myTime sub(myTime mt){int msum=hour*3600+minute*60+second;int ssum=mt.hour*3600+mt.minute*60+mt.second;int s=(msum-ssum)%60;int m=(msum-ssum-s)%3600/60;int h=(msum-ssum)/3600;return new myTime(h,m,s);}public String toString(){String s="";s=s+ (char)(hour/10+48) +(char)(hour%10+48)+":";s=s+ (char)(minute/10+48) +(char)(minute%10+48)+":";s=s+ (char)(second/10+48) +(char)(second%10+48);return s;}boolean compare(myTime mt){if(mt.hour*3600+mt.minute*60+mt.second>hour*3600+minute*60+second) return false;return true;}}

注意点（返回Incorrect performance log的情况）：

1.每一个程序只能运行一遍

2.程序的开始可关闭都要满足栈的关系，即后开始的必须先关闭

3.程序的结束时间可能不大于开始时间

4.所有都处理完之后，栈必须是空的。