Compilare: main.cpp: In function 'void update(int, int)': main.cpp:12:9: warning: statement has no effect [-Wunused-value] 12 | for(x; x < N; x += x&-x) | ^ main.cpp: In function 'int query(int, int)': main.cpp:19:9: warning: statement has no effect [-Wunused-value] 19 | for(x; x; x -= x&-x) | ^