Submission #961792

#	Time	Username	Problem	Language	Result	Execution time	Memory
961792		Gr1sen	Connecting Supertrees (IOI20_supertrees)	C++17	96 / 100	222 ms	27476 KiB

supertrees

#include"supertrees.h"
#include<iostream>
#include<vector>
#include<algorithm>
#include<iomanip>

using namespace std;

#define vi vector<int>
#define vvi vector<vi>

vvi L;
vi K, K3;
vi F;

int find(int a) {return (F[a] == -1 ? a : F[a] = find(F[a]));}

void uunion(int a, int b) {
    a = find(a); b = find(b);
    if (a == b) return;
    F[a] = b;
}

int oink(vvi p) {
    int n = p.size();
    vvi Adj(n, vi(n, 0));
    L.clear(); F.clear(); F.resize(n, -1);
    K.clear(); K.resize(n, -1); K3.clear(); K3.resize(n, 0);
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if (i == j) continue;
            if (p[i][j]) {
                if (p[i][j] == 1) K[i] = j;
                if (p[i][j] == 3) K3[i] = 1;
                uunion(i, j);
                continue;
            }
            //cerr << i << " " << j << " " << find(i) << " " << find(j) << endl;
            if (find(i) == find(j)) return 0;
        }
    }
    L.resize(n);
    for (int i = 0; i < n; i++) {
        L[find(i)].push_back(i);
    }
    //cerr << endl;
    for (auto i : L) {
        /*
        for (auto j : i) {
            cerr << j << " ";
        }
        cerr << endl;
        //*/

        if (i.size() < 2) continue;
        if (i.size() == 2) {
            int a = i[0], b = i[1];
            if (p[a][b] >= 2) return 0;
            Adj[a][b] = 1;
            Adj[b][a] = 1;
            continue;
        }
        int l = i[i.size()-1];
        bool q = K3[l];
        if (q && i.size() == 3) return 0;
        //cerr << q << endl;
        int l3 = -1;
        for (int j = 0; j < i.size(); j++) {
            int a = i[j];
            if (q != K3[a]) return 0;
            //cerr << l << " " << a << " " << K[a] << " " << j << endl;
            if (l == a) break;
            if (K[a] <= a) {
                if (q && l == l3 && a == i[i.size()-1]) return 0;
                Adj[l][a] = 1;
                Adj[a][l] = 1;
                if (q && l3 == -1 && l != i[i.size()-1]) {
                    Adj[a][i[i.size()-1]] = 1;
                    Adj[i[i.size()-1]][a] = 1;
                    l3 = a;
                }
                l = a;
                continue;
            }
            Adj[K[a]][a] = 1;
            Adj[a][K[a]] = 1;
            if (q && l3 == -1) return 0;
        }
    }
    build(Adj);
    return 1;
}

int oinkoink(vvi p) {
    int n = p.size();
    vvi Adj(n, vi(n, 0));
    F.clear(); F.resize(n, -1);
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if (p[i][j]) {
                if (find(i) == find(j)) continue;
                Adj[i][j] = 1; 
                Adj[j][i] = 1; 
                uunion(i, j);
                continue;
            }
            //cerr << i << " " << j << " " << find(i) << " " << find(j) << endl;
            if (find(i) == find(j)) return 0;
        }
    }
    build(Adj);
    return 1;
}

int construct(std::vector<std::vector<int>> p) {
    return oink(p);
}

Compilation message (stderr)

supertrees.cpp: In function 'int oink(std::vector<std::vector<int> >)':
supertrees.cpp:68:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |         for (int j = 0; j < i.size(); j++) {
      |                         ~~^~~~~~~~~~

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