Compilare: user.cpp: In function ‘int main()’: user.cpp:23:9: warning: unused variable ‘a’ [-Wunused-variable] int a, n, i, j, k, s=0, maxs, nrdiag; ^ user.cpp:23:21: warning: unused variable ‘k’ [-Wunused-variable] int a, n, i, j, k, s=0, maxs, nrdiag; ^ user.cpp:23:24: warning: unused variable ‘s’ [-Wunused-variable] int a, n, i, j, k, s=0, maxs, nrdiag; ^ user.cpp:23:29: warning: unused variable ‘maxs’ [-Wunused-variable] int a, n, i, j, k, s=0, maxs, nrdiag; ^ user.cpp:23:35: warning: variable ‘nrdiag’ set but not used [-Wunused-but-set-variable] int a, n, i, j, k, s=0, maxs, nrdiag; ^ user.cpp:24:9: warning: ‘n’ is used uninitialized in this function [-Wuninitialized] g<<n; ^