Compilare: main.cpp: In function 'int main()': main.cpp:68:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("abx.in","r",stdin); ^ main.cpp:69:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("abx.out","w",stdout); ^ main.cpp:71:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%llu%llu", &n, &m); ^ main.cpp:73:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%llu", &nr); ^ main.cpp: In function 'll cb(ll, ll)': main.cpp:63:12: warning: 'rez' may be used uninitialized in this function [-Wmaybe-uninitialized] return rez; ^~~