Submission #419424

#	Time	Username	Problem	Language	Result	Execution time	Memory
419424		vkgainz	Connecting Supertrees (IOI20_supertrees)	C++17	0 / 100	236 ms	22024 KiB

supertrees

#include <bits/stdc++.h>
using namespace std;


void build(vector<vector<int>> b);

int construct(vector<vector<int>> p) {
    int n = (int) p.size();
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < n; j++) {
            if(p[i][j] == 3) return 0;
            if(p[i][j] != p[j][i]) return 0;
        }
    }

    vector<vector<int>> put(n, vector<int>(n));
    vector<bool> vis(n);
    vector<bool> inTree(n);
    for(int i = 0; i < n; i++) {
        if(vis[i]) continue;
        queue<int> q;
        vector<int> f, s;
        q.push(i);
        vis[i] = true;
        while(!q.empty()) {
            auto curr = q.front();
            f.push_back(curr);
            q.pop();
            for(int next = 0; next < n; next++) {
                if(p[curr][next] == 0) continue;

                if(p[curr][next] == 1) {
                    if(!vis[next]) {
                        vis[next] = true;
                        q.push(next);
                    }
                }
                else {
                    if(!vis[next]) {
                        vis[next] = true;
                        s.push_back(next);
                    }
                }
            }
        }
        
        for(int i = 0; i < (int) f.size(); i++) {
            for(int j = i + 1; j < (int) f.size(); j++) {
                if(p[f[i]][f[j]] != 0 || p[f[j]][f[i]] != 0) return 0;
            }
        }
        for(int i = 0; i < (int) f.size() - 1; i++) {
            put[f[i]][f[i + 1]] = 1, put[f[i + 1]][f[i]] = 1;
            inTree[f[i]] = 1;
        }
        
        if(s.empty()) continue;
        if((int) s.size() == 1) return 0;
        for(int i = 0; i < (int) s.size() - 1; i++) {
            put[s[i]][s[i + 1]] = 1, put[s[i + 1]][s[i]] = 1;
        }
        put[i][s[0]] = 1, put[s[0]][i] = 1;
        put[i][s.back()] = 1, put[s.back()][i] = 1;
    }

    build(put);
    return 1;
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 10
• Subtask 3: 0 / 19
• Subtask 4: 0 / 35
• Subtask 5: 0 / 21
• Subtask 6: 0 / 4