Submission #478348

#	Time	Username	Problem	Language	Result	Execution time	Memory
478348		ponytail	Connecting Supertrees (IOI20_supertrees)	C++17	21 / 100	253 ms	24008 KiB

supertrees

#include "supertrees.h"
#include <bits/stdc++.h>
#include <vector>
#include <cassert>
#include <cstdio>
#include <cstdlib>
#include <string>
 
using namespace std;

int dsu[1000];
 
int set_of(int u) {
    if(dsu[u] == u) return u;
    return dsu[u] = set_of(dsu[u]);
}
 
void union_(int u, int v) {
    dsu[set_of(u)] = set_of(v);
}
 
int construct(std::vector<std::vector<int>> p) {
	int n = p.size();
	std::vector<std::vector<int>> answer;
	for (int i = 0; i < n; i++) {
		std::vector<int> row;
		row.resize(n);
		answer.push_back(row);
	}
    for(int i=0; i<n; i++) {
        dsu[i] = i;
    }
    
    for(int i=0; i<n; i++) {
        for(int j=0; j<n; j++) {
            if(p[i][j] == 1 && set_of(i) != set_of(j)) {
                union_(i, j);
                answer[i][j] = answer[j][i] = 1;
            }
        }
    }
    for(int i=0; i<n; i++) {
        for(int j=0; j<n; j++) {
            if(p[i][j] == 0 && set_of(i) == set_of(j)) {
                return 0;
            }
        }
    }
	build(answer);
	return 1;
}
 
 

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