Submission #422704

#	Time	Username	Problem	Language	Result	Execution time	Memory
422704		oleh1421	Split the Attractions (IOI19_split)	C++17	40 / 100	138 ms	27240 KiB

split

//#include "grader.cpp"
#include "split.h"
#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
const int N=200010;
vector<int>g[N],t[N];
pair<int,int>gr[3];
int sz[N];
int P[N];
bool used[N];
void dfs(int v,int pr){
    sz[v]=1;
    P[v]=pr;
    used[v]=true;
    for (int to:g[v]){
        if (!used[to]){
            t[v].push_back(to);
            t[to].push_back(v);
            dfs(to,v);
            sz[v]+=sz[to];
        }
    }
}
int ans[N];
void Mark(int v,int ind){
    if (!gr[ind].first) return;
    gr[ind].first--;
    ans[v]=gr[ind].second;
//    if (!ind) cout<<"OK "<<v<<" "<<gr[ind].first<<" "<<gr[ind].second<<endl;
    for (int to:t[v]){
        if (ans[to]) continue;
        Mark(to,ind);
    }
}
bool DONE=false;
void dfs1(int v,int pr){
    if (DONE) return;
    vector<pair<int,int> >go;
    for (int to:g[v]){
        if (to!=pr){
            go.push_back({sz[to],to});
        }
    }
    sort(go.begin(),go.end());
    reverse(go.begin(),go.end());
    if (go[0].first>=gr[0].first && go[0].first<=gr[1].first+gr[2].first){
        if (go[0].first<=gr[0].first+gr[2].first){
            ans[go[0].second]=gr[0].second;
            ans[v]=gr[1].second;
            Mark(go[0].second,0);
            Mark(v,1);
//            for (int i=0;i<7;i++) cout<<ans[i]<<" ";
//            cout<<endl;
//            cout<<"OK "<<v<<" "<<go[0].second<<endl;
        } else {
            ans[go[0].second]=gr[1].second;
            ans[v]=gr[0].second;
            Mark(go[0].second,1);
            Mark(v,0);
        }
        DONE=true;
        return;
    }
    if (go[0].first<gr[0].first) return;
    dfs1(go[0].first,v);
}
vector<int> find_split(int n, int a, int b, int c, vector<int> p, vector<int> q) {
    gr[0]={a,1};
    gr[1]={b,2};
    gr[2]={c,3};
    sort(gr,gr+3);
	for (int i=0;i<p.size();i++){
        g[p[i]].push_back(q[i]);
        g[q[i]].push_back(p[i]);
	}
    dfs(0,-1);
    for (int i=0;i<n;i++){
        if (sz[i]>=gr[0].first && sz[i]<=n-gr[0].first){
            if (sz[i]<=n-gr[1].first){
                ans[P[i]]=gr[1].second;
                ans[i]=gr[0].second;
                Mark(P[i],1);
                Mark(i,0);
            } else {
                ans[P[i]]=gr[0].first;
                ans[i]=gr[1].first;
                Mark(P[i],0);
                Mark(i,1);
            }
            DONE=true;
            break;
        }
    }
//        dfs1(0,-1);
    if (DONE){
        for (int i=0;i<n;i++){
            if (!ans[i]) ans[i]=gr[2].second;
        }
    }

	vector<int>res;
	for (int i=0;i<n;i++) res.push_back(ans[i]);
	return res;
}
/**
9 10
4 2 3
0 1
0 2
0 3
0 4
0 6
0 8
1 7
3 7
4 5
5 6


*/

Compilation message (stderr)

split.cpp: In function 'std::vector<int> find_split(int, int, int, int, std::vector<int>, std::vector<int>)':
split.cpp:73:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |  for (int i=0;i<p.size();i++){
      |               ~^~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 11 / 11
• Subtask 3: 22 / 22
• Subtask 4: 0 / 24
• Subtask 5: 0 / 36