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-rw-r--r--19/open/plat/boxes.cpp75
1 files changed, 75 insertions, 0 deletions
diff --git a/19/open/plat/boxes.cpp b/19/open/plat/boxes.cpp
new file mode 100644
index 0000000..75695b9
--- /dev/null
+++ b/19/open/plat/boxes.cpp
@@ -0,0 +1,75 @@
+#include <bits/stdc++.h>
+#include "grader.h"
+using namespace std;
+typedef pair<int, int> ii;
+typedef vector<int> vi;
+typedef vector<ii> vii;
+
+int d[100005], sz[100005], L[100005][20];
+ii P[100005];
+vi G[100005];
+
+void addRoad(int a, int b) {
+ G[a].push_back(b);
+ G[b].push_back(a);
+}
+
+void dfs(int u, int p) {
+ d[u] = (p != -1 ? d[p] : 0) + 1;
+ sz[u] = 1;
+ L[u][0] = p;
+ for (int i = 0; i < 16; i++) {
+ if (L[u][i] != -1) L[u][i + 1] = L[L[u][i]][i];
+ }
+ for (auto& v : G[u]) {
+ if (v != p) {
+ dfs(v, u);
+ sz[u] += sz[v];
+ }
+ }
+}
+
+int lca(int u, int v) {
+ if (d[u] > d[v]) swap(u, v);
+ for (int i = 16; i >= 0; i--) if (d[v] - (1 << i) >= d[u]) v = L[v][i];
+ if (u == v) return u;
+ for (int i = 16; i >= 0; i--) if (L[u][i] != -1 && L[u][i] != L[v][i]) u = L[u][i], v = L[v][i];
+ return L[u][0];
+}
+
+int pre(int l, int u) {
+ for (int i = 16; i >= 0; i--) {
+ if (L[u][i] != -1 && d[L[u][i]] > d[l]) u = L[u][i];
+ }
+ return u;
+}
+
+void solve(int u, int p, int x, int y) {
+ P[u] = ii(x, y);
+ setFarmLocation(u, x, y);
+ y += sz[u];
+ for (auto& v : G[u]) {
+ if (v != p) {
+ y -= sz[v];
+ solve(v, u, x, y);
+ x += sz[v];
+ }
+ }
+}
+
+void buildFarms() {
+ memset(L, -1, sizeof(L));
+ dfs(0, -1);
+ solve(0, -1, 1, 1);
+}
+
+void notifyFJ(int a, int b) {
+ if (a == b) addBox(P[a].first, P[a].second, P[a].first, P[a].second);
+ else {
+ int u = lca(a, b);
+ int v = pre(u, (a != u ? a : b));
+ if (a != u) swap(u, v);
+ addBox(P[u].first, P[u].second, P[a].first, P[a].second);
+ addBox(P[v].first, P[v].second, P[b].first, P[b].second);
+ }
+}