Submission #621153

#	Time	Username	Problem	Language	Result	Execution time	Memory
621153		Mr_Husanboy	Connecting Supertrees (IOI20_supertrees)	C++14	21 / 100	192 ms	24132 KiB

supertrees

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


struct DSU{
    vector<int> parent, sz;
    void init(int n){
        parent.resize(n), sz.resize(n);
        for(int i = 0; i < n; i ++) parent[i] = i, sz[i] = 1;
    }

    int get(int a){
        return parent[a] == a ? a : parent[a] = get(parent[a]);
    }

    void unite(int a, int b){
        a = get(a); b = get(b);
        if(a==b) return;
        if(sz[a] < sz[b]) swap(a,b);
        sz[a] += sz[b];
        parent[b] = a;
    }
};


int construct(vector<vector<int>> p) {

	int n = p.size();
	vector<vector<int>> b(n,vector<int> (n));
    DSU t; t.init(n);
    for(int j = 0; j < n; j ++){
        for(int i = 0; i < n; i ++){
            if(p[i][j]) t.unite(i,j);
        }
    }

    for(int i = 0; i < n; i ++){
        for(int j = 0; j < n; j ++){
            if(p[i][j] == 0 && t.get(i) == t.get(j)) return 0;
        }
    }
    vector<vector<int>> par(n);
    for(int i = 0; i < n; i ++){
        par[t.get(i)].push_back(i);
    }

    for(int i = 0; i < n; i ++){
        for(int j = 1; j < par[i].size(); j ++){
            int u = par[i][j], v = par[i][j-1];
            b[u][v] = b[v][u] = 1;
        }
    }
    build(b);
    return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:50:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |         for(int j = 1; j < par[i].size(); j ++){
      |                        ~~^~~~~~~~~~~~~~~

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