Submission #968661

#TimeUsernameProblemLanguageResultExecution timeMemory
968661LecorbioSynchronization (JOI13_synchronization)C++17
100 / 100
309 ms26964 KiB
#include <bits/stdc++.h> #define fi first #define se second #define sajz(x) (int)(x).size() #define all(x) (x).begin(), (x).end() using namespace std; typedef long long ll; typedef unsigned long long ull; const int N = 1e5+7, P = 20, B = 1<<17; int n, m, q, timer = -1, dist[N], tin[N], tout[N], up[N][P], val[N], last[N], tree[B*2]; pair<int,int> edge[N]; vector<int> g[N]; bool active[N]; void dfs(int v, int par){ tin[v] = ++timer; val[v] = 1; up[v][0] = par; for (int i=1; i<P; i++) up[v][i] = up[up[v][i-1]][i-1]; for (auto u : g[v]){ if (u == par) continue; dist[u] = dist[v] + 1; dfs(u, v); } tout[v] = timer; } void update(int v, int a, int b, int p, int k, int x){ if (a > k || b < p) return; else if (a >= p && b <= k){ tree[v] += x; return; } int mid = (a+b) / 2; update(v*2, a, mid, p, k, x); update(v*2+1, mid+1, b, p, k, x); } int query(int v){ v += B; int res = 0; while (v){ res += tree[v]; v /= 2; } return res; } int find_root(int v){ int x = query(tin[v]); for (int i=P-1; i>=0; i--){ if (query(tin[up[v][i]]) == x) v = up[v][i]; } return v; } int main(){ ios_base::sync_with_stdio(false); cin.tie(NULL); cin >> n >> m >> q; for (int i=1; i<n; i++){ int a, b; cin >> a >> b; edge[i] = {a, b}; g[a].push_back(b); g[b].push_back(a); } dist[1] = 1; dfs(1, 1); for (int i=1; i<=n; i++) tree[tin[i]+B] = -dist[i]; for (int i=0; i<m; i++){ int x; cin >> x; auto [a, b] = edge[x]; if (tin[b] > tin[a]) swap(a, b); if (!active[x]){ val[find_root(b)] += val[a] - last[a]; update(1, 0, B-1, tin[a], tout[a], 1); active[x] = true; }else{ val[a] = last[a] = val[find_root(b)]; update(1, 0, B-1, tin[a], tout[a], -1); active[x] = false; } } for (int i=0; i<q; i++){ int v; cin >> v; cout << val[find_root(v)] << '\n'; } return 0; } /* 5 6 3 1 2 1 3 2 4 2 5 1 2 1 4 4 3 1 4 5 */
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