Compilare: main.cpp: In function 'int query(int)': main.cpp:12:27: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses] x -= (x ^ (x - 1) & x); ~~~~~~~~^~~ main.cpp: In function 'void update(int, int)': main.cpp:21:27: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses] x += (x ^ (x - 1) & x); ~~~~~~~~^~~ main.cpp: In function 'int main()': main.cpp:28:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("scmax.in", "r", stdin); ^ main.cpp:29:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:31:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^ main.cpp:58:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("scmax.out", "w", stdout); ^