Compilare: user.cpp: In function ‘int main()’: user.cpp:14:25: warning: unused variable ‘cj’ [-Wunused-variable] int i, k=0, f=0, j, cj, r, e, b; ^ user.cpp:16:28: 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:18:26: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(s+1, 1, n, fin); ^