Submission #991501

#	Time	Username	Problem	Language	Result	Execution time	Memory
991501		MarwenElarbi	Split the Attractions (IOI19_split)	C++17	22 / 100	542 ms	1048576 KiB

split

#include<bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define ll long long
#define pb push_back
const int nax=200005;
vector<int> adj[nax];
vector<pair<int,int>> nab;
int aa;
vector<int> res;
int sz[nax];
bool test;
int N;
void precompute(int x,int p){
    sz[x]=1;
    for(auto u:adj[x]){
        if(u==p) continue;
        precompute(u,x);
        sz[x]+=sz[u];
    }
}
void dfs1(int x,int p,int k){
    if(nab[k].fi<=0) return;
    nab[k].fi--;
    res[x]=k+1;
    for(auto u:adj[x]){
        if(u==p) continue;
        dfs1(u,x,k);
    }
}
void dfs(int x,int p){
    for(auto u:adj[x]){
        if(test) return;
        if(u==p) continue;
        //cout <<sz[u]<<" "<<N-sz[u]<<" "<<nab[0].fi<<" "<<nab[1].fi<<endl;
        if(sz[u]>=nab[0].fi&&N-sz[u]>=nab[1].fi){
            test=true;
            dfs1(u,x,0);
            dfs1(x,u,1);
            return;
        }else if(sz[u]>=nab[1].fi&&N-sz[u]>=nab[0].fi){
            test=true;
            dfs1(u,x,1);
            dfs1(x,u,0);
            return;
        }
        dfs(u,x);
    }
}
vector<int> find_split(int n, int a, int b, int c, vector<int> p, vector<int> q){
    N=n;
    nab.pb({a,1});
    nab.pb({b,2});
    nab.pb({c,3});
    sort(nab.begin(),nab.end());
    vector<int> convert(4);
    for (int i = 0; i < 3; ++i) convert[nab[i].se]=i+1;
    res.resize(n,0);
    for (int i = 0; i < (int)p.size(); ++i)
    {
        adj[p[i]].pb(q[i]);
        adj[q[i]].pb(p[i]);
    }
    precompute(0,-1);
    dfs(0,-1);
    if(!test) return res;
    for (int i = 0; i < n; ++i)
    {
       if(res[i]==0) res[i]=convert[3];
       else res[i]=convert[res[i]];
    }//cout <<endl;
    return res;
}

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