Compilare: user.cpp: In function ‘int Sum(int, int)’: user.cpp:33:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (res>=p) res-=p; ^ user.cpp: In function ‘void Read(int&, int&, int&, int&)’: user.cpp:42:10: warning: unused variable ‘nr’ [-Wunused-variable] { int j,nr=0,c[5]; ^ user.cpp: In function ‘int main()’: user.cpp:55:9: warning: unused variable ‘j’ [-Wunused-variable] { int i,j,xa,ya,xb,yb,res; ^