Runtime Error
/in/foo.cc: In function 'bool dfs(int, int, int)':
/in/foo.cc:15:7: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
if(k==n)
^
/in/foo.cc: In function 'bool dfs(int, int, int)':
/in/foo.cc:15:7: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
if(k==n)
^
