foo.cc: In function 'int main()':
foo.cc:15:38: error: incompatible types in assignment of 'bool' to 'int [30001]'
     dp=(dp[j]>dp[j-wi[i]]+vi[i]*wi[i]);
                                      ^
foo.cc:9:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&w,&n);
  ~~~~~^~~~~~~~~~~~~~
foo.cc:11:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",wi+i,vi+i);
   ~~~~~^~~~~~~~~~~~~~~~~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。