【poj3683】Priest John’s Busiest Day

2014年12月14日2,1672

Description

John is the only priest in his town. September 1st is the John’s busiest day in a year because there is an old legend in the town that the couple who get married on that day will be forever blessed by the God of Love. This year N couples plan to get married on the blessed day. The i-th couple plan to hold their wedding from time Si to time Ti. According to the traditions in the town, there must be a special ceremony on which the couple stand before the priest and accept blessings. The i-th couple need Di minutes to finish this ceremony. Moreover, this ceremony must be either at the beginning or the ending of the wedding (i.e. it must be either from Si to Si + Di, or from TiDi to Ti). Could you tell John how to arrange his schedule so that he can present at every special ceremonies of the weddings.

Note that John can not be present at two weddings simultaneously.

Input

The first line contains a integer N ( 1 ≤ N ≤ 1000).
The next N lines contain the Si, Ti and Di. Si and Ti are in the format of hh:mm.

Output

The first line of output contains “YES” or “NO” indicating whether John can be present at every special ceremony. If it is “YES”, output another N lines describing the staring time and finishing time of all the ceremonies.

Sample Input

Sample Output

题解

有n对新人要举行仪式,每对都有两个时间段可以选择,问是否可以所有新人的仪式时间不重叠

若两个时间段重叠则不能同时选TAT

缩点后 拓扑排序得出方案

按输入顺序输出

 

  • 邹雨恒2014年12月15日 上午7:32 回复

    我版本跟你们不一样吗……我咋没有这题

    #1  
    • hzwer2014年12月15日 上午8:13 回复
      admin

      噢是poj。。。

      #11