Compilare: main.cpp: In function 'void try_bulan()': main.cpp:51:18: warning: variable 'it' set but not used [-Wunused-but-set-variable] auto it = intervals.lower_bound ({0, x}); ^~ main.cpp:40:9: warning: unused variable 'extra' [-Wunused-variable] int extra = 0; ^~~~~ main.cpp: In function 'int main()': main.cpp:77:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("ordonare.in", "r", stdin); ^ main.cpp:78:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("ordonare.out", "w", stdout); ^ main.cpp: In function 'void try_bulan()': main.cpp:57:17: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized] int r; ^