Compilare: main.cpp: In member function 'void graf::dfs(int)': main.cpp:50:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<edges[nod].size();i++) ~^~~~~~~~~~~~~~~~~~ main.cpp: In member function 'void graf::dfst(int)': main.cpp:59:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<tedges[nod].size();i++) ~^~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'void graf::component()': main.cpp:79:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<components.size();i++){ ~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:90:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.in", "r", stdin); ^ main.cpp:91:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ctc.out", "w", stdout); ^