Submission #1212528

#	Time	Username	Problem	Language	Result	Execution time	Memory
1212528		guagua0407	Split the Attractions (IOI19_split)	C++20	22 / 100	562 ms	1114112 KiB

split

#include "split.h"
//#include "grader.cpp"
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

vector<int> find_split(int n, int a, int b, int c, vector<int> p, vector<int> q) {
    vector<pair<int,int>> vec={{a,1},{b,2},{c,3}};
    sort(all(vec));
    vector<vector<int>> adj(n);
    int m=(int)p.size();
    for(int i=0;i<m;i++){
        adj[p[i]].push_back(q[i]);
        adj[q[i]].push_back(p[i]);
    }
    vector<int> sz(n);
    vector<int> par(n);
    function<void(int,int)> dfs=[&](int v,int p){
        sz[v]=1;
        par[v]=p;
        for(auto u:adj[v]){
            if(u==p) continue;
            dfs(u,v);
            sz[v]+=sz[u];
        }
    };
    dfs(0,-1);
    int x=-1;
    vector<int> C(n);
    for(int i=0;i<n;i++){
        if(min(sz[i],n-sz[i])>=vec[0].f and max(sz[i],n-sz[i])>=vec[1].f){
            x=i;
        }
    }
    if(x==-1) return C;
    C=vector<int>(n,vec[2].s);
    vector<int> st;
    function<void(int,int)> dfs2=[&](int v,int p){
        st.push_back(v);
        for(auto u:adj[v]){
            if(u==p) continue;
            dfs2(u,v);
        }
    };
    dfs2(x,par[x]);
    for(int i=0;i<(sz[x]<=n-sz[x]?vec[0].f:vec[1].f);i++){
        C[st[i]]=(sz[x]<=n-sz[x]?vec[0].s:vec[1].s);
    }
    st.clear();
    dfs2(par[x],x);
    for(int i=0;i<(sz[x]<=n-sz[x]?vec[1].f:vec[0].f);i++){
        C[st[i]]=(sz[x]<=n-sz[x]?vec[1].s:vec[0].s);
    }
	return C;
}
/*
6 5
2 2 2
0 1
1 2
2 3
3 4
4 5
*/

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