Compilare: user.cpp: In function ‘int main()’: user.cpp:30:10: warning: unused variable ‘j’ [-Wunused-variable] int i, j, h, l, comp, mask, max, best, count, tmp; ^ user.cpp:32:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("carti2.out", "w", stdout); ^ user.cpp:39:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &T); ^ user.cpp:41:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %d %d", &N, &H, &L, &G); ^ user.cpp:44:49: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &book[i].h, &book[i].l); ^