Compilare: main.cpp: In function 'void update(int, int)': main.cpp:22:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int x = a; x <= n; x += x & -x){ ~~^~~~ main.cpp: In function 'int main()': main.cpp:31:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < n; i++){ ~~^~~ main.cpp:33:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i + 1; j <= n; j += j & -j){ ~~^~~~ main.cpp:37:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int q = 0; q < m; q++){ ~~^~~