Compilare: user.cpp: In function ‘int query(int, int)’: user.cpp:7:10: warning: statement has no effect [-Wunused-value] for(x;x>0;x-=(x^(x-1))&x) ^ user.cpp: In function ‘void update(int, int, int)’: user.cpp:16:10: warning: statement has no effect [-Wunused-value] for(x;x<2000;x+=(x^(x-1))&x) ^ user.cpp: In function ‘int query1(int, int)’: user.cpp:24:10: warning: statement has no effect [-Wunused-value] for(x;x>0;x-=(x^(x-1))&x){ ^ user.cpp: In function ‘void update1(int, int, int)’: user.cpp:31:10: warning: statement has no effect [-Wunused-value] for(x;x<2000;x+=(x^(x-1))&x){ ^ user.cpp: In function ‘int main()’: user.cpp:37:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evantai.in","r",stdin); ^ user.cpp:38:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evantai.out","w",stdout); ^ user.cpp:40:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:42:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^