Compilare: main.cpp: In function 'void build(int, int, int)': main.cpp:88:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(x < aint[nod<<1].size() && y < aint[nod << 1|1].size()) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:88:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(x < aint[nod<<1].size() && y < aint[nod << 1|1].size()) ~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:111:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(x < aint[nod<<1].size()) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:117:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(y < aint[nod<<1|1].size()) ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void query(int, int, int, int, int)': main.cpp:134:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(x < szz && y < aint[nod].size()) ~~^~~~~~~~~~~~~~~~~~ main.cpp:163:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(y < aint[nod].size()) ~~^~~~~~~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:16:29: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^