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 SegmentTree::print()': main.cpp:76:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(cnt > tree.size()-1) ~~~~^~~~~~~~~~~~~~~ main.cpp:84:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(cnt > tree.size()-1) ~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'int32_t main()': main.cpp:145:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("arbint.in", "r", stdin); ^ main.cpp:146:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("arbint.out", "w", stdout); ^