Wrong Answer
/in/foo.cc: In function 'dd ch(double)':
/in/foo.cc:57:20: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
if (fa[u]!=edge[i].to)
^
/in/foo.cc: In function 'dd ch(double)':
/in/foo.cc:57:20: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
if (fa[u]!=edge[i].to)
^
