Submission #276363

#	Time	Username	Problem	Language	Result	Execution time	Memory
276363		Toirov_Sadi	Split the Attractions (IOI19_split)	C++17	7 / 100	400 ms	27040 KiB

split

#include<bits/stdc++.h>
#include "split.h"

using namespace std;

const int N = 1e5 + 7;

int ti;
int in[N];
int used[N];
vector<int> g[N];
vector<int> t;
void dfs(int v){
    used[v] = 1;
    in[v] = ++ ti;
    t.push_back(v);
    for(auto to: g[v]){
        if(used[to] == 0) dfs(to);
    }
}
vector<int> find_split(int n, int a, int b, int c, vector<int> p, vector<int> q) {
    map<pair<int, int>, int> used;
    for(int i = 0; i < (int)p.size(); i ++){
        g[p[i]].push_back(q[i]);
        g[q[i]].push_back(p[i]);
        used[{p[i], q[i]}] = used[{q[i], p[i]}] = 1;
    }
    int start = 0;
    for(int i = 0; i < n; i ++){
        if((int)g[i].size() == 1) start = i;
    }
    dfs(start);

    vector<int> g1[4];
    vector<int> res(n);
    for(int i = 0; i < (int)t.size(); i ++){
        if(a --> 0){
            res[t[i]] = 1;
            g1[1].push_back(t[i]);
        }
        else if(b --> 0){
            res[t[i]] = 2;
            g1[2].push_back(t[i]);
        }
        else if(c --> 0){
            res[t[i]] = 3;
            g1[3].push_back(t[i]);
        }
    }
    for(int i = 1; i <= 3; i ++){
        sort(g1[i].begin(), g1[i].end(), [](int x, int y){
            return (in[x] < in[y]);
        });
    }
    for(int i = 1; i <= 3; i ++){
        for(int j = 1; j < (int)g1[i].size(); j ++){
            int v = g1[i][j - 1];
            int to = g1[i][j];
            if(used[{v, to}] == 0){
                return vector<int>(n, 0);
            }
        }
    }
    return res;
}

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