Compilare: user.cpp: In function ‘void update(int, int)’: user.cpp:61:13: warning: statement has no effect [-Wunused-value] for (pos; pos <= NMAX; pos += lsb (pos)) { ^ user.cpp: In function ‘int query(int)’: user.cpp:69:13: warning: statement has no effect [-Wunused-value] for (pos; pos > 0; pos -= lsb (pos)) { ^ user.cpp: In function ‘int main()’: user.cpp:102:56: warning: iteration 505 invokes undefined behavior [-Waggressive-loop-optimizations] for (int x = 0; x <= NMAX + 5; ++x) bit[x] = 0; ~~~~~~~^~~ user.cpp:102:31: note: within this loop for (int x = 0; x <= NMAX + 5; ++x) bit[x] = 0; ~~^~~~~~~~~~~ user.cpp:99:52: warning: iteration 505 invokes undefined behavior [-Waggressive-loop-optimizations] for (int x = 0; x <= NMAX + 5; ++x) sum[x] = 0; ~~~~~~~^~~ user.cpp:99:27: note: within this loop for (int x = 0; x <= NMAX + 5; ++x) sum[x] = 0; ~~^~~~~~~~~~~