Compilare: user.cpp: In function ‘bool Compare(int)’: user.cpp:21:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp: In function ‘void SolveFor(int)’: user.cpp:33:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < V[pos].size(); i++) { ~~^~~~~~~~~~~~~~~ user.cpp:31:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp: In function ‘bool Compare(int)’: user.cpp:28:1: warning: control reaches end of non-void function [-Wreturn-type] } ^