This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
struct DSU{
int path[100100], sz[100100];
void init(int n){for (int i=0;i<n;i++) path[i] = i, sz[i] = 1;}
int find(int s){
if (s==path[s]) return s;
return path[s] = find(path[s]);
}
bool merge(int s, int v){
s = find(s), v = find(v);
if (s==v) return 0;
path[s] = v;
sz[v] += sz[s];
return 1;
}
int getsz(int s){return sz[find(s)];}
}dsu;
int n, a, b, c, sz[100100], sidx[100100], idx[5];
vector<int> adj[100100], ret;
int getsz(int s, int pa = -1){
sz[s] = 1;
for (auto &v:adj[s]) if (v!=pa) sz[s] += getsz(v, s);
return sz[s];
}
int cent;
int getcent(int s, int pa = -1){
for (auto &v:adj[s]) if (v!=pa && sz[v]*2>=n) return getcent(v, s);
return s;
}
void dfs(int s, int val, int pa){
sidx[s] = val;
for (auto &v:adj[s]) if (v!=pa) dfs(v, val, s);
}
int cnt0 = 0;
void dfs0(int s){
if (cnt0>=a) return;
++cnt0;
ret[s] = idx[1];
for (auto &v:adj[s]) if (!ret[v] && v!=cent) dfs0(v);
}
int cnt1 = 0;
void dfs1(int s){
if (cnt1>=b) return;
ret[s] = idx[2];
++cnt1;
for (auto &v:adj[s]) if (!ret[v]) dfs1(v);
}
void solve_tree(){
getsz(0);
cent = getcent(0);
getsz(cent);
int cnt = 1;
dsu.init(n);
for (auto &v:adj[cent]) dfs(v, cnt++, cent);
for (auto &v:adj[cent]) dsu.sz[sidx[v]] = sz[v];
for (auto &v:adj[cent]) if (sz[v]>=a){
dfs0(v);
dfs1(cent);
for (auto &x:ret) if (!x) x = idx[3];
return;
}
}
vector<int> find_split(int N, int A, int B, int C, vector<int> p, vector<int> q) {
ret.resize(N);
n = N;
vector<pair<int, int>> tmp;
tmp.emplace_back(A, 1);
tmp.emplace_back(B, 2);
tmp.emplace_back(C, 3);
sort(tmp.begin(), tmp.end());
a = tmp[0].first, b = tmp[1].first, c = tmp[2].first;
idx[1] = tmp[0].second, idx[2] = tmp[1].second, idx[3] = tmp[2].second;
vector<pair<int, int>> E;
dsu.init(n);
for (int i=0;i<(int)p.size();i++) {
if (dsu.merge(p[i], q[i])){
adj[p[i]].push_back(q[i]);
adj[q[i]].push_back(p[i]);
}
else E.emplace_back(p[i], q[i]);
}
solve_tree();
if (ret[0]) return ret;
int v = -1;
for (auto &p:E) if (p.first!=cent && p.second!=cent){
if (dsu.merge(sidx[p.first], sidx[p.second])){
adj[p.first].push_back(p.second);
adj[p.second].push_back(p.first);
}
if (dsu.getsz(sidx[p.first])>=a){
dfs0(p.first);
v = p.first;
break;
}
}
if (v==-1) return ret;
dfs1(cent);
for (auto &x:ret) if (!x) x = idx[3];
return ret;
}
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