Compilare: user.cpp: In function ‘void Update(int, int)’: user.cpp:19:10: warning: statement has no effect [-Wunused-value] for(x;x<=3*n;x=x+((x&(x-1))^x)) ^ user.cpp: In function ‘void Reset(int)’: user.cpp:23:10: warning: statement has no effect [-Wunused-value] for(x;x<=3*n;x=x+((x&(x-1))^x)) ^ user.cpp: In function ‘int Query(int)’: user.cpp:28:10: warning: statement has no effect [-Wunused-value] for(x;x>0;x=x-((x&(x-1))^x)) ^ user.cpp: In function ‘int main()’: user.cpp:45:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<positions[i].size();j++){ ^ user.cpp:49:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<positions[i].size();j++) ^ user.cpp:33:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mate.in","r",stdin); ^ user.cpp:34:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mate.out","w",stdout); ^ user.cpp:36:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:40:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^