Compilare: main.cpp: In function 'void show()': main.cpp:57:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int v=0; v<edges.size(); v++) { ~^~~~~~~~~~~~~ main.cpp: In function 'void showScc()': main.cpp:67:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<scc.size(); i++) { ~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:75:34: 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:76:36: 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); ^