Compilare: user.cpp: In function ‘int main()’: user.cpp:42:13: warning: unused variable ‘l1’ [-Wunused-variable] int i,j,l1,l2,c1,c2,ai,aj; ^ user.cpp:42:16: warning: unused variable ‘l2’ [-Wunused-variable] int i,j,l1,l2,c1,c2,ai,aj; ^ user.cpp:42:19: warning: unused variable ‘c1’ [-Wunused-variable] int i,j,l1,l2,c1,c2,ai,aj; ^ user.cpp:42:22: warning: unused variable ‘c2’ [-Wunused-variable] int i,j,l1,l2,c1,c2,ai,aj; ^ user.cpp:42:25: warning: unused variable ‘ai’ [-Wunused-variable] int i,j,l1,l2,c1,c2,ai,aj; ^ user.cpp:42:28: warning: unused variable ‘aj’ [-Wunused-variable] int i,j,l1,l2,c1,c2,ai,aj; ^