This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "bits/stdc++.h"
using namespace std;
const int md = (int) 1e9;
int dx[] = {1, -1, 0, 0};
int dy[] = {0, 0, 1, -1};
int DistanceSum(int N, int *X, int *Y) {
int ret = 0;
int n = 0, m = 0;
for (int i = 0; i < N; ++i) {
n = max(n, X[i]);
m = max(m, Y[i]);
}
auto sum = [&](int r) {
return (int) (((long long) r * (r + 1) / 2) % md);
};
auto mul = [&](int x, int y) {
return (int) ((long long) x * y % md);
};
auto add = [&](int& x, int y) {
x += y;
if (x >= md) x -= md;
};
for (int i = 0; i < N; ++i) {
int x = X[i], y = Y[i];
int sx = mul(sum(x - 1), m);
add(sx, mul(sum(n - x), m));
int sy = mul(sum(y - 1), n);
add(sy, mul(sum(m - y), n));
add(ret, sx);
add(ret, sy);
}
return ret;
}
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