Compilare: main.cpp: In function 'bool Check(int)': main.cpp:37:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Hash[modd].size(); ++i ) ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void Do()': main.cpp:85:7: warning: unused variable 'trg' [-Wunused-variable] int trg; ^~~ main.cpp:86:7: warning: unused variable 'modd' [-Wunused-variable] int modd; ^~~~ main.cpp: In function 'void Topo_sort(int)': main.cpp:99:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Ad[nod].size(); ++i ) ~~^~~~~~~~~~~~~~~~