Compilare: main.cpp: In function 'int binary_search(int)': main.cpp:10:65: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int step = start; step != 0; step >>= 1) if (at + step <= size && v[aux[at + step]] < x) at += step; ~~~~~~~~~~^~~~~~~ main.cpp: In function 'void increase_size()': main.cpp:16:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (start <= size >> 1u) start <<= 1; ~~~~~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:28:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (x == size) increase_size(); ~~^~~~~~~