#include <bits/stdc++.h>
#include "catdog.h"
using namespace std;
#ifdef ngu
#include "debug.h"
#else
#define debug(...) 42
#endif
template<class A, class B>
bool minz(A &a, const B &b) {
return a > b ? a = b, true : false;
}
const int INF = int(1e9);
struct Node {
int dat[2][2];
Node() {
for (int i = 0; i < 2; ++i) {
for (int j = 0; j < 2; ++j) {
dat[i][j] = INF;
}
}
}
Node operator + (const Node &o) const {
Node res;
for (int i = 0; i < 2; ++i) {
for (int j = 0; j < 2; ++j) {
if (dat[i][j] != INF) {
for (int ii = 0; ii < 2; ++ii) {
for (int jj = 0; jj < 2; ++jj) {
if (o.dat[ii][jj] != INF) {
int v = dat[i][j] + o.dat[ii][jj] + (j ^ ii);
minz(res.dat[i][jj], v);
}
}
}
}
}
}
return res;
}
};
struct Segtree {
int n;
vector<Node> s;
Segtree() {};
Segtree(int n): n(n) {
s.resize(4 << __lg(n), Node());
}
void bld(int id, int l, int r) {
if (l == r) {
s[id].dat[0][0] = 0;
s[id].dat[1][1] = 0;
return;
}
int md = (l + r) / 2;
bld(id * 2, l, md);
bld(id * 2 + 1, md + 1, r);
s[id] = s[id * 2] + s[id * 2 + 1];
}
void bld() {
bld(1, 1, n);
}
void upd(int i, int C, int D, int x) {
int id = 1, l = 1, r = n;
while (l ^ r) {
int md = (l + r) / 2;
id *= 2;
if (i <= md) {
r = md;
} else {
l = md + 1;
id += 1;
}
}
if (x != 0) {
s[id].dat[0][0] = C + (x == 1);
}
if (x != 1) {
s[id].dat[1][1] = D + (x == 0);
}
while (id > 1) {
id /= 2;
s[id] = s[id * 2] + s[id * 2 + 1];
}
}
int get(int i) {
return min(s[1].dat[i][0], s[1].dat[i][1]);
}
};
const int N = int(1e5) + 5;
int n;
int pos[N], head[N], tail[N], sz[N], par[N], c[N];
int s[2][N], up[2][N];
vector<int> g[N];
Segtree tree[N];
void dfs(int u) {
for (int &v : g[u]) {
if (v == par[u]) {
swap(v, g[u].back());
g[u].pop_back();
break;
}
}
sz[u] = 1;
for (int v : g[u]) {
par[v] = u;
dfs(v);
sz[u] += sz[v];
}
}
int order;
void hld(int u) {
pos[u] = ++order;
tail[head[u]] = order;
if (g[u].size()) {
int x = *max_element(g[u].begin(), g[u].end(), [&](int i, int j) {
return sz[i] < sz[j];
});
head[x] = head[u];
hld(x);
for (int v : g[u]) {
if (v ^ x) {
head[v] = v;
order = 0;
hld(v);
}
}
}
}
void app(int u) {
while (head[u] != 1) {
u = head[u];
int p = par[u];
for (int i = 0; i < 2; ++i) {
up[i][p] -= s[i][u];
s[i][u] = tree[u].get(i);
up[i][p] += s[i][u];
}
tree[head[p]].upd(pos[p], up[0][p], up[1][p], c[p]);
u = p;
}
}
int upd(int v, int x) {
c[v] = x;
tree[head[v]].upd(pos[v], up[0][v], up[1][v], c[v]);
app(v);
return min(tree[1].get(0), tree[1].get(1));
}
int cat(int v) {
return upd(v, 1);
}
int dog(int v) {
return upd(v, 0);
}
int neighbor(int v) {
return upd(v, 2);
}
void initialize(int x, std::vector<int> A, std::vector<int> B) {
n = x;
for (int i = 0; i + 1 < n; ++i) {
int u = A[i], v = B[i];
g[u].emplace_back(v);
g[v].emplace_back(u);
}
dfs(1);
head[1] = 1;
hld(1);
for (int i = 1; i <= n; ++i) {
c[i] = 2;
if (tail[i]) {
tree[i] = Segtree(tail[i]);
tree[i].bld();
}
}
}
#ifdef ngu
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
freopen("test.inp", "r", stdin);
freopen("test.out", "w", stdout);
int n;
cin >> n;
vector<int> A, B;
for (int i = 1; i < n; ++i) {
int u, v;
cin >> u >> v;
A.emplace_back(u);
B.emplace_back(v);
}
initialize(n, A, B);
int q;
cin >> q;
while (q--) {
int type, v;
cin >> type >> v;
cout << upd(v, type) << "\n";
}
}
#endif
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
6764 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
6764 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
6748 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
6764 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
