Compilare: user.cpp: In function ‘int main()’: user.cpp:17:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &n, &k); ^ user.cpp:19:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &v[i]); ^ user.cpp:37:30: warning: ‘r’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(f, "%d %d %d\n", r - k + 2, r + 1, ans); ^