Wrong Answer
/in/foo.cc: In function 'void DFS(int)':
/in/foo.cc:8:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<s[x].size();i++){
~^~~~~~~~~~~~
/in/foo.cc: In function 'void DFS(int)':
/in/foo.cc:8:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<s[x].size();i++){
~^~~~~~~~~~~~
