Compilare: main.cpp: In function 'int main()': main.cpp:35:15: warning: statement has no effect [-Wunused-value] for(it;it!=it2;it++) ^ main.cpp:41:15: warning: statement has no effect [-Wunused-value] for(it;it!=vertical.begin() && it!=it2;) ^ main.cpp:51:15: warning: statement has no effect [-Wunused-value] for(it;it!=it2;it++) ^ main.cpp:57:15: warning: statement has no effect [-Wunused-value] for(it;it!=orizontal.begin() && it!=it2;) ^