foo.cc: In function 'int main()':
foo.cc:12:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(long long i=p+p;i<prime.size();i+=p)prime[i]=false;
                       ~^~~~~~~~~~~~~
foo.cc:24:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(long long p=2;p<prime.size();p++)if(prime[p]){
                    ~^~~~~~~~~~~~~

正在同步测试数据，请稍后
[Hydro](https://hydro.ac)提供评测服务