Compilare: user.cpp: In function ‘int main()’: user.cpp:7:73: warning: unused variable ‘mat4’ [-Wunused-variable] int mat[51][51],mati[51][51],mat1[51][51],mat2[51][51],mat3[51][51],mat4[51][51],i,j,k,l,n,cont=0,cont1; ^ user.cpp:7:103: warning: unused variable ‘cont1’ [-Wunused-variable] int mat[51][51],mati[51][51],mat1[51][51],mat2[51][51],mat3[51][51],mat4[51][51],i,j,k,l,n,cont=0,cont1; ^ user.cpp:8:10: warning: unused variable ‘c’ [-Wunused-variable] bool c=0; ^