Compilare: main.cpp: In function 'int main()': main.cpp:156:17: warning: variable 't' set but not used [-Wunused-but-set-variable] int t; ^ main.cpp:171:17: warning: variable 'a' set but not used [-Wunused-but-set-variable] int a; ^ main.cpp:185:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < connections.size(); i++) ~~^~~~~~~~~~~~~~~~~~~~