Compilare: user.cpp: In function ‘void update(int, int)’: user.cpp:13:33: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] for (; x <= N; x += x^(x-1) & x) ^ user.cpp: In function ‘int query(int)’: user.cpp:22:28: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] for (; x; x -= x^(x-1) & x) ^ user.cpp: In function ‘int main()’: user.cpp:73:11: warning: unused variable ‘diff’ [-Wunused-variable] float diff=(float)t2-(float)t1; ^ user.cpp:34:36: 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); ^ user.cpp:35:38: 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); ^ user.cpp:37:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:40:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^