Compilare: user.cpp: In function ‘int main()’: user.cpp:35:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,k; ^ user.cpp:35:13: warning: unused variable ‘k’ [-Wunused-variable] int i,j,k; ^ user.cpp:34:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:38:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&v[i]); ^