Compilare: main.cpp:4:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas] #pragma GCC optimization ("O3") main.cpp:5:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas] #pragma GCC optimization ("unroll-loops") main.cpp: In member function 'void bheap::remove_xth(ll)': main.cpp:58:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(2*now+1 < heap.size()) ~~~~~~~~^~~~~~~~~~~~~ main.cpp:60:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(2*now+2 >= heap.size()) ~~~~~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int32_t main()': main.cpp:89:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("heapuri.in", "r", stdin); ^ main.cpp:90:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("heapuri.out", "w", stdout); ^