ABC045 D すぬけ君の塗り絵

//const ll MOD=(ll)1e9+7;
//const ll inf=(ll)1e14;
const int dy[]={1,0,-1};
const int dx[]={1,0,-1};
ll n,m,h,w;
string s;
map<pair<int,int>,ll> mp;
int x[100001],y[100001];
ll ans[10];

int main(){
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.precision(10);
  cout<<fixed;
#ifdef LOCAL_DEFINE
  FILE *stream1;
  //FILE *stream2;
  stream1=freopen("in","r",stdin);
  //stream2=freopen("out","w",stdout);
  if(stream1==NULL)return 0;
  //if(stream2==NULL)return 0;
#endif
  cin>>h>>w>>n;
  for(int i=0;i<n;i++){
    cin>>y[i]>>x[i];
    x[i]--;y[i]--;
    for(int j=-2;j<=0;j++){
      for(int k=-2;k<=0;k++){
        if(y[i]+j<0 || y[i]+j+2>=h)continue;
        if(x[i]+k<0 || x[i]+k+2>=w)continue;
        mp[make_pair(y[i]+j,x[i]+k)]++;
      }
    }
  }
  for(auto ite=mp.begin();ite!=mp.end();ite++){
    //auto temp=ite->fi;
    //int temp2=ite->se;
    //print((temp.fi),(temp.se),temp2);
    ans[ite->se]++;
  }
  ans[0]=(w-2)*(h-2)-(int)mp.size();
  println__(ans,ans+10);
#ifdef LOCAL_DEFINE
  cerr<<"Time elapsed: "<<1.0*clock()/CLOCKS_PER_SEC<<"s.\n";
  fclose(stream1);
  //fclose(stream2);
#endif
  return 0;
}

• 塗られた付近のデータだけ保存しとけば、残りは0個なのでね。