The son can either go from x to y, or from y to x. 
如果x->y有路,y->x无路,算task is possible吗? 

• 算 (95) kicc 2006-02-26 14:49:59
• yes. "either" , not "both" (95) contest_clarificator 2006-02-26 14:50:21
• Re:如果x->y有路,y->x无路,算task is possible吗? (7) Rexer 2006-02-26 15:09:02
• :) (0) contest_clarificator 2006-02-26 15:10:37
• sign..... (95) magic_pig 2006-02-26 15:21:03
  • sigh..... 晕了.. (0) magic_pig 2006-02-26 15:21:46
• 汗，WA了20多次原来是题意理解错了 (0) idea 2006-02-26 15:28:15
  • :) (0) contest_clarificator 2006-02-26 15:34:16
• 这题目是判断图是不是有向强连通图吗? (1) huicpc21 2006-08-16 10:45:57
  • 判断图是不是单向连通 (5) yiyiyi4321 2007-09-11 11:26:54
• 晕。。。理解错误了半天。。。笔记本没电了。。。明天再切。。。。。 (0) c4pt0r 2008-06-19 00:03:14