#include <algorithm>
#include <iostream>
#include <numeric>
#include <cassert>
#include <vector>
#include <queue>
#include <map>
typedef long long llong;
const int MAXN = 100000 + 10;
const int MOD = 1'000'000'000;
int n;
llong ans;
int sz[MAXN];
int par[MAXN];
llong dp[MAXN];
llong chain[MAXN];
int inChain[MAXN];
int x[MAXN], y[MAXN];
std::vector <int> out[MAXN];
std::pair <int,int> delta[] = {{-1, 0}, {0, -1}, {1, 0}, {0, 1}};
std::map <std::pair <int,int>, int> map;
std::vector <int> g[MAXN];
std::vector <int> t[MAXN];
std::queue <int> q;
void dfsDown(int node)
{
dp[node] = 0;
sz[node] = 1;
for (const int &u : t[node])
{
if (u == par[node])
{
continue;
}
dfsDown(u);
sz[node] += sz[u];
dp[node] += dp[u] + sz[u];
}
}
void dfsUp(int node)
{
if (node != 1)
{
dp[node] = (dp[par[node]] + n + 2 * MOD - 2 * chain[inChain[node]]) % MOD;
}
for (const int &u : t[node])
{
if (u != par[node])
{
dfsUp(u);
}
}
}
int timer;
void dfsChain(int node)
{
inChain[node] = timer;
chain[inChain[node]] += sz[node];
chain[inChain[node]] %= MOD;
for (const int &u : out[node])
{
if (inChain[u] == 0)
{
dfsChain(u);
}
}
}
int DistanceSum(int N, int *X, int *Y)
{
n = N;
for (int i = 1 ; i <= n ; ++i)
{
x[i] = X[i - 1];
y[i] = Y[i - 1];
map[{x[i], y[i]}] = i;
}
for (int i = 1 ; i <= n ; ++i)
{
for (const auto &[dx, dy] : delta)
{
if (map.count({x[i] + dx, y[i] + dy}))
{
g[i].push_back(map[{x[i] + dx, y[i] + dy}]);
}
}
}
q.push(1);
par[1] = 0;
std::fill(par + 2, par + n + 1, -1);
while (!q.empty())
{
int top = q.front();
q.pop();
for (const int &i : g[top])
{
if (par[i] == -1)
{
par[i] = top;
t[top].push_back(i);
q.push(i);
} else if (par[i] != top && par[top] != i)
{
out[top].push_back(i);
}
}
}
dfsDown(1);
for (int i = 1 ; i <= n ; ++i)
{
if (inChain[i] == 0)
{
timer++;
dfsChain(i);
}
}
dfsUp(1);
for (int i = 1 ; i <= n ; ++i)
{
ans += dp[i];
assert(ans >= 0);
ans %= MOD;
}
assert(ans & 1);
return ans / 2;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
9 ms |
14804 KB |
Execution killed with signal 6 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
13 ms |
15056 KB |
Execution killed with signal 6 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
44 ms |
22588 KB |
Execution killed with signal 6 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
39 ms |
21856 KB |
Execution killed with signal 6 |
2 |
Halted |
0 ms |
0 KB |
- |