/in/foo.cc:2:0: warning: ignoring #pragma comment  [-Wunknown-pragmas]
 #pragma comment(linker, "/STACK:102400000,102400000")
 
/in/foo.cc: In function 'void dfs(int, int)':
/in/foo.cc:80:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             f[u][1]+=tmp;if(f[u][1]>=mod)f[u][1]-=mod;
                             ~~~~~~~^~~~~