Compilare: main.cpp: In member function 'void SegTree::build(std::vector<long long int>&)': main.cpp:66:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (start < v.size ()) start <<= 1; ~~~~~~^~~~~~~~~~~ main.cpp:68:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size (); i++) { ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:107:18: warning: unused variable 'mn' [-Wunused-variable] ll l, r, mn = INF, mx = -INF; ^~ main.cpp:107:28: warning: unused variable 'mx' [-Wunused-variable] ll l, r, mn = INF, mx = -INF; ^~