http://poj.org/problem?id=1916 #include <iostream> #include <string.h> using namespace std; int a[1030][1030]; int main() { int test,d,n,i,max,j,temp,x,y,now; cin>>test; while(test--) { cin>>d; cin>>n; memset(a,0,sizeof(a)); for(i=0;i<n;i++) { cin>>x>>y; cin>>a[x][y]; } max=-1; for(i=1;i<1025;i++) { a[i][0]+=a[i-1][0]; a[0][i]+=a[0][i-1]; } temp=2*d+1; for(i=1;i<1025;i++) for(j=1;j<1025;j++) { a[i][j]+=a[i-1][j]+a[i][j-1]-a[i-1][j-1]; if(i>=temp&&j>=temp) { now=a[i][j]-a[i-temp][j]-a[i][j-temp]+a[i-temp][j-temp]; if(now>max) { max=now; x=i-d; y=j-d; } } } cout<<x<<" "<<y<<" "<<max<<endl; } return 0; }
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