#include<cstdio>
#include<map>
#include<queue>
int a,x,y,p,q,i,j,dx[]={1,0,-1,0},dy[]={0,1,0,-1};
long long sum,mod=1e9;
bool m[2002][2002];
std::queue<int>P,Q;
int DistanceSum (int N, int *X, int *Y)
{
a=N;
x=2147483647;y=2147483647;
for(i=0;i<a;i++)x=std::min(x,X[i]),y=std::min(y,Y[i]);
for(i=0;i<a;i++)X[i]-=x,Y[i]-=y,m[X[i]][Y[i]]=1;
for(i=0;i<a;i++)
{
P.push(X[i]);
Q.push(Y[i]);
for(j=0;j<a;j++)D[X[j]][Y[j]]=0;
D[X[i]][Y[i]]=1;sum++;
while(!P.empty())
{
p=P.front();P.pop();q=Q.front();Q.pop();
for(int k=0;k<4;k++)
{
x=p+dx[k];y=q+dy[k];
if(x>=0&&y>=0&&m[x][y]&&D[x][y]==0)
{
D[x][y]=D[p][q]+1;
sum+=D[x][y];
P.push(x);Q.push(y);
}
}
}
sum-=a;
}
sum/=(long long)2;
return sum%mod;
}
Compilation message
city.cpp: In function ‘int DistanceSum(int, int*, int*)’:
city.cpp:18:25: error: ‘D’ was not declared in this scope
for(j=0;j<a;j++)D[X[j]][Y[j]]=0;
^
city.cpp:19:9: error: ‘D’ was not declared in this scope
D[X[i]][Y[i]]=1;sum++;
^
