Compilare: user.cpp: In function ‘i64 cautx(i64, int, int)’: user.cpp:11:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a > S) ^ user.cpp: In function ‘bool check(i64, int, int)’: user.cpp:20:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return obj >= k; ^ user.cpp: In function ‘int main()’: user.cpp:41:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &k); ^ user.cpp:43:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &b[i], &a[i]); ^