Compilare: user.cpp: In function ‘int main()’: user.cpp:113:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < st.size() ; i ++) ^ user.cpp:115:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<dr.size();i++) ^ user.cpp:54:12: warning: unused variable ‘sol’ [-Wunused-variable] double sol; ^