提交记录

#include<bits/stdc++.h>
using namespace std;
int n,m,ans;
int mp[5005][5005];
int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);cout.tie(0);
	cin>>n>>m;
	for(int i=1;i<=n;i++){
		int x,y,v; cin>>x>>y>>v;
		mp[x+1][y+1]+=v;
	}
	for(int i=m;i<=5003;i++){
		for(int j=m;j<=5003;j++){
			mp[i][j]+=mp[i-1][j]+mp[i][j-1]-mp[i-1][j-1];
			ans=max(ans,mp[i][j]-mp[i-m][j]-mp[i][j-m]+mp[i-m][j-m]);
		}
	}
	cout<<ans;
	return 0;
}