Compilare: main.cpp: In function 'void append(std::vector<int>&, int, int)': main.cpp:26:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos >= arr.size()) ~~~~^~~~~~~~~~~~~ main.cpp: In function 'void updateTree(int, int)': main.cpp:106:13: warning: unused variable 'mid' [-Wunused-variable] int mid = (left + right) / 2; ^~~ main.cpp: In function 'int query(int, int, int, int)': main.cpp:129:9: warning: unused variable 'mid' [-Wunused-variable] int mid = (left + right) / 2; ^~~