Compilare: user.cpp: In function ‘long long int query(int)’: user.cpp:16:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<n;i++){ ^ user.cpp:30:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<n){ ^ user.cpp: In function ‘int main()’: user.cpp:43:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<n;i++){ ^ user.cpp:41:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d%d%d", &n, &l, &u); ^ user.cpp:44:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%u", &v[i]); ^