Submission #699209

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
699209	2023-02-16 06:05:54	Cross_Ratio	Parachute rings (IOI12_rings)	C++14	52 / 100	4054 ms	166264 KiB

rings

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#include <bits/stdc++.h>
using namespace std;
set<array<int, 2>> S2;
vector<vector<int>> adj;
struct UnionFind {
    vector<int> root;
    int cypt = -1;
    bool deg3 = false;
    int pt = -1;
    void init(int N) {
        root.resize(N);
        fill(root.begin(),root.end(),-1);
    }
    void bye() {
        root.clear();
        root.shrink_to_fit();
    }
    int Find(int n) {
        if(root[n]<0) return n;
        int r = Find(root[n]);
        root[n] = r;
        return r;
    }
    void Merge(int x, int y) {
        if(deg3) return;
        int d1 = adj[x].size() - (S2.find({min(pt, x), max(pt, x)})!=S2.end()?1:0);
        int d2 = adj[y].size() - (S2.find({min(pt, y), max(pt, y)})!=S2.end()?1:0);
        if(d1>=3) deg3 = true;
        if(d2>=3) deg3 = true;
        if(deg3) bye();
 
 
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• Subtask 1: 20 / 20
• Subtask 2: 0 / 17
• Subtask 3: 18 / 18
• Subtask 4: 14 / 14
• Subtask 5: 0 / 31