Compilare: main.cpp: In function 'void dfs(int)': main.cpp:69:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<c[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void rezolv()': main.cpp:106:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<cer2.size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int atr(char)': main.cpp:32:1: warning: control reaches end of non-void function [-Wreturn-type] } ^