Compilare: main.cpp: In function 'void update(int, int)': main.cpp:20:30: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses] for (; x <= N; x += x^(x-1) & x) ~~~~~~^~~ main.cpp: In function 'int query(int)': main.cpp:26:25: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses] for (; x; x -= x^(x-1) & x) ~~~~~~^~~ main.cpp: In function 'int main()': main.cpp:34:33: 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:36:35: 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); ^ main.cpp:37:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ main.cpp:39:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^