Compilare: main.cpp: In function 'int main()': main.cpp:62:16: warning: statement has no effect [-Wunused-value] for(itx;itx!=itx2;itx++) ^ main.cpp:69:16: warning: statement has no effect [-Wunused-value] for(itx;itx!=vertical.begin() && itx!=itx2;) ^ main.cpp:80:16: warning: statement has no effect [-Wunused-value] for(ity;ity!=ity2;ity++) ^ main.cpp:87:16: warning: statement has no effect [-Wunused-value] for(ity;ity!=orizontal.begin() && ity!=ity2;) ^