Submission #671879

#	Time	Username	Problem	Language	Result	Execution time	Memory
671879		a_aguilo	Connecting Supertrees (IOI20_supertrees)	C++14	0 / 100	1098 ms	12528 KiB

supertrees

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

using namespace std;

int n;
vector<int> father;

int root(int node){
    if(father[node] == node) return node;
    return father[node] = root(father[node]);
}

int merge(int NodeA, int NodeB, vector<vector<int>> p){
    int rootA = root(NodeA);
    int rootB = root(NodeB);
    if(rootB == rootA) return 1;
    father[rootA] = rootB;
    for(int i = 0; i < n; ++i){
        if(i == rootA or i == rootB)continue;
        if(!(((p[rootA][i]) and (p[rootB][i])) or ((!p[rootA][i]) and (!p[rootB][i])))) return 0;
    }
    return 1;
}
int construct(vector<vector<int>> p){
    n = p[0].size();
    father = vector<int>(n);
    for(int i = 0; i < n; ++i) {
        father[i] = i;
    }
    for(int i = 0; i < n; ++i){
        for(int j = i+1; j < n; ++j){
            if(p[i][j]){
                int sol = merge(i, j, p);
                if(!sol) return 0;
            }else{
                for(int k = 0; k < n; ++k){
                    if(k == i or k==j) continue;
                    if(p[i][k] and p[j][k]) return 0;
                }
            }
        }
    }
    vector<vector<int>> edges(n, vector<int>(n, 0));
    for(int i = 0; i < n; ++i) {
        int MyRoot = root(i);
        if(MyRoot==i) continue;
        edges[MyRoot][i] = edges[i][MyRoot] = 1;
    }
    build(edges);
    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