Compilare: user.cpp: In function ‘int main()’: user.cpp:22:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<v.size() && !b; ++j) ^ user.cpp:18:32: 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:20:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &x); ^