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 "split.h"
#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 3;
int n, a, b, c, sz[N], d[N];
int num_a, num_b, num_c;
vector<int> adj[N];
bool vis[N], in_subtree[N];
vector<int> ans;
int add_not_subtree(int u, int forbidden, int cnt, int val){
//cout << "add_not_subtree " << u << " " << forbidden << " " << cnt << " " << val << endl;
if(!cnt) return 0;
ans[u] = val;
--cnt;
for(int to: adj[u])
if(to != forbidden && d[to] == d[u] + 1)
cnt = add_not_subtree(to, forbidden, cnt, val);
return cnt;
}
int add_subtree(int u, int cnt, int val){
//cout << "add_subtree " << u << " " << cnt << " " << val << endl;
if(!cnt) return 0;
ans[u] = val;
--cnt;
for(int to: adj[u])
if(d[to] == d[u] + 1)
cnt = add_subtree(to, cnt, val);
return cnt;
}
void d_dfs(int u){
sz[u] = 1;
vis[u] = true;
for(int to: adj[u])
if(!vis[to]){
d[to] = d[u] + 1;
d_dfs(to);
sz[u] += sz[to];
}
}
bool dfs(int u){
bool bigger = false;
for(int to: adj[u])
if(d[to] == d[u] + 1){
if(dfs(to)) return true;
if(sz[to] >= a) bigger = true;
if(bigger) break;
}
if(!bigger && sz[u] >= a){
if(n - sz[u] >= a){
if(sz[u] <= n - sz[u]){
add_subtree(u, a, num_a);
add_not_subtree(0, u, b, num_b);
for(int i = 0; i < n; ++i)
if(!ans[i])
ans[i] = num_c;
}
else{
add_subtree(u, b, num_b);
add_not_subtree(0, u, a, num_a);
for(int i = 0; i < n; ++i)
if(!ans[i])
ans[i] = num_c;
}
return true;
}
else return false;
}
return false;
}
vector<int> find_split(int _n, int _a, int _b, int _c, vector<int> p, vector<int> q) {
n = _n, a = _a, b = _b, c = _c;
num_a = 1, num_b = 2, num_c = 3;
for(int i = 0; i < p.size(); ++i){
adj[p[i]].push_back(q[i]);
adj[q[i]].push_back(p[i]);
}
if(a > b) swap(a, b), swap(num_a, num_b);
if(a > c) swap(a, c), swap(num_a, num_c);
if(b > c) swap(b, c), swap(num_b, num_c);
ans.resize(n, 0);
for(int i = 0; i < n; ++i){
d[i] = 0;
d_dfs(i);
if(dfs(i)) return ans;
}
return ans;
}
Compilation message (stderr)
split.cpp: In function 'std::vector<int> find_split(int, int, int, int, std::vector<int>, std::vector<int>)':
split.cpp:81:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
81 | for(int i = 0; i < p.size(); ++i){
| ~~^~~~~~~~~~
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