Compilare: user.cpp: In function ‘void update(int, int)’: user.cpp:6:10: warning: statement has no effect [-Wunused-value] for(x;x<=n;x+=(x^(x-1)&x)) ^ user.cpp:6:27: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] for(x;x<=n;x+=(x^(x-1)&x)) ^ user.cpp: In function ‘int query(int)’: user.cpp:12:10: warning: statement has no effect [-Wunused-value] for(x;x>0;x-=(x^(x-1)&x)) ^ user.cpp:12:26: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] for(x;x>0;x-=(x^(x-1)&x)) ^ user.cpp: In function ‘int main()’: user.cpp:18:36: 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:19:38: 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:21:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:23:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ user.cpp:44:20: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] poz=up[poz]; ^