Compilare: user.cpp: In function ‘int main()’: user.cpp:64:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d\n", &n); ^ user.cpp:66:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &l[i], &r[i]); ^ user.cpp: In function ‘int diag(int*, int*, int)’: user.cpp:13:9: warning: ‘st1[0]’ may be used uninitialized in this function [-Wmaybe-uninitialized] int st1[2*NMAX], st2[2*NMAX], prim1, ultim1, prim2, ultim2, maxim; ^ user.cpp:13:22: warning: ‘st2[0]’ may be used uninitialized in this function [-Wmaybe-uninitialized] int st1[2*NMAX], st2[2*NMAX], prim1, ultim1, prim2, ultim2, maxim; ^