Compilare: user.cpp: In function ‘int main()’: user.cpp:12:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:9:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d%d", &n, &k); ^ user.cpp:14:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d", &v[i]); ^