Compilare: user.cpp: In function ‘void Solve(int)’: user.cpp:81:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<Op[i].size();j++) ^ user.cpp:85:17: warning: unused variable ‘line’ [-Wunused-variable] int line=Op2[i][j].first; ^ user.cpp:75:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j; ^ user.cpp:75:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^