Compilare: main.cpp: In function 'int main()': main.cpp:42:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<vapoare.size();++j){ ~^~~~~~~~~~~~~~~ main.cpp:29:24: warning: unused variable 'a' [-Wunused-variable] double vxi,vyi,fxi,a,b,rez; ^ main.cpp:29:26: warning: unused variable 'b' [-Wunused-variable] double vxi,vyi,fxi,a,b,rez; ^ main.cpp:29:28: warning: unused variable 'rez' [-Wunused-variable] double vxi,vyi,fxi,a,b,rez; ^~~