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28 lines
617 B
C++
28 lines
617 B
C++
#include<bits/stdc++.h>
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using namespace std;
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const int maxn = 5005;
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int s[maxn][maxn];
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int main(){
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ios::sync_with_stdio(false);
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int n,r;
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cin>>n>>r;
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int xx=r,yy=r;
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for(int i=1;i<=n;i++){
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int x,y,w;
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cin>>x>>y>>w;
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x++,y++;
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s[x][y]+=w;
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xx=max(xx,x);
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yy=max(yy,y);
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}
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for(int i=1;i<=xx;i++)
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for(int j=1;j<=yy;j++)
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s[i][j]+=s[i-1][j]+s[i][j-1]-s[i-1][j-1];
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int ans=0;
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for(int i=r;i<=xx;i++)
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for(int j=r;j<=yy;j++)
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ans=max(ans,s[i][j]-s[i-r][j]-s[i][j-r]+s[i-r][j-r]);
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cout<<ans;
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return 0;
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}
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