| # | 제출 시각 | 아이디 | 문제 | 언어 | 결과 | 실행 시간 | 메모리 |
|---|---|---|---|---|---|---|---|
| 1260961 | icebear | Cats or Dogs (JOI18_catdog) | C++20 | 0 ms | 0 KiB |
// ~~ icebear ~~
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> ii;
typedef pair<int, ii> iii;
template<class T>
bool minimize(T &a, const T &b) {
if (a > b) return a = b, true;
return false;
}
template<class T>
bool maximize(T &a, const T &b) {
if (a < b) return a = b, true;
return false;
}
#define FOR(i,a,b) for(int i=(a); i<=(b); ++i)
#define FORR(i,a,b) for(int i=(a); i>=(b); --i)
#define REP(i, n) for(int i=0; i<(n); ++i)
#define RED(i, n) for(int i=(n)-1; i>=0; --i)
#define MASK(i) (1LL << (i))
#define BIT(S, i) (((S) >> (i)) & 1)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define task "icebear"
const int MOD = 1e9 + 7;
const int inf = 1e9 + 27092008;
const ll INF = 1e18 + 27092008;
const int N = 1e5 + 5;
int n, q, A[N], B[N];
vector<int> G[N];
int f[N][3], state[N];
void initialize(int N, int A[], int B[]) {
cin >> N;
n = N;
FOR(i, 2, N) {
cin >> A[i] >> B[i];
G[A[i]].pb(B[i]);
G[B[i]].pb(A[i]);
}
}
void dfs(int u, int par) {
if (state[u] == 0) f[u][0] = f[u][1] = f[u][2] = 0;
else f[u][state[u]] = 0;
for(int v : G[u]) if (v != par) {
dfs(v, u);
f[u][0] = min(inf, f[u][0] + min({f[v][0], f[v][1] + 1, f[v][2] + 1}));
f[u][1] = min(inf, f[u][1] + min({f[v][1], f[v][0], f[v][2] + 1}));
f[u][2] = min(inf, f[u][2] + min({f[v][2], f[v][0], f[v][1] + 1}));
}
}
void cat(int v) {
state[v] = 1;
}
void dog(int v) {
state[v] = 2;
}
void neighbor(int v) {
state[v] = 0;
}
void init(void) {
initialize(n, A, B);
}
void process(void) {
cin >> q;
while(q--) {
int t, v;
cin >> t >> v;
if (t == 1) cat(v);
else if (t == 2) dog(v);
else neighbor(v);
memset(f, 0x3f, sizeof f);
dfs(1, -1);
cout << min({f[1][0], f[1][1], f[1][2]}) << '\n';
}
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
if (fopen(task".inp", "r")) {
freopen(task".inp", "r", stdin);
freopen(task".out", "w", stdout);
}
int tc = 1;
// cin >> tc;
while(tc--) {
init();
process();
}
return 0;
}