Submission #1076111

#	Time	Username	Problem	Language	Result	Execution time	Memory
1076111		Hectorungo_18	Connecting Supertrees (IOI20_supertrees)	C++14	11 / 100	147 ms	22060 KiB

supertrees

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

using namespace std;



const int N = 1e3+7;
int p[N];
int sz[N];

int pa(int u){
	p[u]=(p[u] == u ? u : pa(p[u]));
	return p[u];
}

bool sm(int u, int v){
	return pa(u) == pa(v);
}

void un(int u, int v){
	if(sm(u, v)) return;
	u = pa(u);
	v = pa(v);
	if(sz[v] > sz[u]) swap(u, v);
	sz[u]+=sz[v];
	p[v]=u;
}

int construct(vector<vector<int>> v) {
	int n = v.size();
	for(int i = 0; i <= n; i++){
		p[i]=i;
		sz[i]=1;
	}
	for(int i = 0; i < n; i++){
        bool ch = 0;
        if(pa(i)==i) ch = 1;
		for(int j = i+1; j < n; j++){
			if(ch){
                if(v[i][j] == 0) continue;
                if(pa(j) == j){
                    un(i, j);
                }
                else return 0;
			}
            else{
                if(pa(j) !=  pa(i)) return 0;
            }
		}
	}

    map<int, int> m;
    for(int i = 0; i < n; i++){
        vector<int> a(4, 0);
        for(int j = 0; j < n; j++){
            if(i == j) continue;
            a[v[i][j]]++;
        }
        if(a[1] > 0) m[i]=1;
        else if(a[2] > 0) m[i]=2;
        else if(a[3] > 0) m[i]=3;
        else m[i]=0;
    }

    vector<vector<int>> ans(n, vector<int> (n, 0));
    for(int i = 0; i < n; i++){
        if(pa(i) != i) continue;
        vector<vector<int>> a(4);
        vector<int> w;
        for(int j = 0; j < n; j++){
            if(pa(j) == i){
                w.push_back(j);
                a[m[j]].push_back(j);
            }
        }
        //aquí ya lo tengo que cambiar si quiero hacer para 3
        for(int j = 0; j < w.size(); j++){
            for(int k = j+1; k < w.size(); k++){
                int r = m[j], s = m[k];
                // if(max(r, s) == 2){
                //     if(v[j][k] != 2) return 0;
                // }
                // else{
                    if(v[j][k] != 1) return 0; 
                // }
            }
        }
        for(int j = 1; j < (int) a[1].size(); j++){
            ans[a[1][j]][a[1][j-1]] = 1;
            ans[a[1][j-1]][a[1][j]] = 1;
        }
        if(a[2].size() == 0) continue;
        for(int j = 1; j < (int) a[2].size(); j++){
            ans[a[2][j]][a[2][j-1]] = 1;
            ans[a[2][j-1]][a[2][j]] = 1;
        }
        if(a[1].size() == 1){
            
            ans[a[2][0]][a[2].back()] = 1;
            ans[a[2].back()][a[2][0]] = 1;
            continue;
        }
        ans[a[2][0]][a[1].back()] = 1;
        ans[a[1].back()][a[2][0]] = 1;
        
        ans[a[2].back()][a[1].back()] = 1;
        ans[a[1].back()][a[2].back()] = 1;
    }
    
    build(ans);

	return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:79:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |         for(int j = 0; j < w.size(); j++){
      |                        ~~^~~~~~~~~~
supertrees.cpp:80:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   80 |             for(int k = j+1; k < w.size(); k++){
      |                              ~~^~~~~~~~~~
supertrees.cpp:81:21: warning: unused variable 'r' [-Wunused-variable]
   81 |                 int r = m[j], s = m[k];
      |                     ^
supertrees.cpp:81:31: warning: unused variable 's' [-Wunused-variable]
   81 |                 int r = m[j], s = m[k];
      |                               ^

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