Compilare: main.cpp: In function 'int main()': main.cpp:42:31: warning: statement has no effect [-Wunused-value] for ( start[ cicle[k] ]; start[ cicle[k] ] < graph[ cicle[k] ].size(); start[ cicle[k] ]++ ){ ~~~~~~~~~~~~~~~~^ main.cpp:42:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( start[ cicle[k] ]; start[ cicle[k] ] < graph[ cicle[k] ].size(); start[ cicle[k] ]++ ){ ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~