/in/foo.cc: In function 'int dfs(int)':
/in/foo.cc:25:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < infect[k].size(); i++) {
~~^~~~~~~~~~~~~~~~~~
/in/foo.cc:27:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int j = 0; j < infect[k].size(); j++) {
~~^~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:47:7: warning: variable 'exist' set but not used [-Wunused-but-set-variable]
bool exist[301] = { 0 };
^~~~~