2501 Average Speed
<div class="highlighter">[*]/*
[*]
[*]第一行的速度可能为0，故初始速度要为0
[*]
[*]
[*]*/
[*]
[*]#include<iostream>
[*]usingnamespacestd;
[*]
[*]intmain()
[*]{
[*]freopen("in.txt","r",stdin);
[*]inth,m,s,k(0);
[*]intpres(0),nows,time;
[*]doublesum=0.0;
[*]charc;
[*]while(scanf("%d%c%d%c%d",&h,&c,&m,&c,&s)!=EOF)
[*]{
[*]c=getchar();
[*]if(h==24)
[*]h=0;
[*]if(c!='\n')
[*]{
[*]
[*]if(pres!=0)
[*]{
[*]nows=s+m*60+h*60*60;
[*]time=nows-pres;
[*]sum+=time*k/3600.0;
[*]}
[*]cin>>k;
[*]
[*]
[*]}
[*]else
[*]
[*]{
[*]
[*]nows=s+m*60+h*60*60;
[*]time=nows-pres;
[*]if(k!=0)
[*]sum+=time*k/3600.0;
[*]
[*]if(h<10)
[*]cout<<0<<h<<":";
[*]else
[*]cout<<h<<":";
[*]if(m<10)
[*]cout<<0<<m<<":";
[*]else
[*]cout<<m<<":";
[*]if(s<10)
[*]cout<<0<<s<<"";
[*]else
[*]cout<<s<<"";
[*]
[*]printf("%0.2lfkm\n",sum);
[*]}
[*]
[*]pres=s+m*60+h*60*60;
[*]
[*]}
[*]
[*]
[*]
[*]
[*]return0;
[*]}
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