oj.uz

Submission #964037

# Submission time Handle Problem Language Result Execution time Memory
964037 2024-04-16T08:35:23 Z SuPythony Connecting Supertrees (IOI20_supertrees) C++17
0 / 100
 1 ms 348 KB 
#include "supertrees.h"
#include <bits/stdc++.h>
using namespace std;

class DSU {
    vector<int> par;
    vector<int> siz;

public:
    DSU(int n) {
        par.resize(n);
        iota(par.begin(),par.end(),0);
        siz.assign(n,1);
    }

    int find_set(int u) {
        if (par[u]==u) return u;
        return par[u]=find_set(par[u]);
    }

    bool is_same(int u, int v) {
        return find_set(u)==find_set(v);
    }

    bool unite_set(int u, int v) {
        u=find_set(u);
        v=find_set(v);
        if (u==v) return false;
        if (siz[u]<siz[v]) swap(u,v);
        par[v]=u;
        siz[u]+=siz[v];
        return true;
    }
};

int construct(vector<vector<int>> p) {
    int n = p.size();
    vector<vector<int>> ans(n,vector<int>(n,0));
    DSU dsu=DSU(n);
    for (int i=0; i<n; i++) {
        for (int j=0; j<n; j++) {
            if (i==j) continue;
            if (p[i][j]==2) {
                dsu.unite_set(i,j);
            }
        }
    }
    for (int i=0; i<n; i++) {
        for (int j=0; j<n; j++) {
            if (p[i][j]==0&&dsu.is_same(i,j)) {
                return 0;
            }
        }
    }
    unordered_map<int,vector<int>> m;
    for (int i=0; i<n; i++) {
        m[dsu.find_set(i)].push_back(i);
    }
    for (auto i: m) {
        vector<int> v=i.second;
        if (v.size()==1||v.size()==0) continue;
        if (v.size()==2) return 0;
        ans[v.front()][v.back()]=1;
        ans[v.back()][v.front()]=1;
        for (int j=0; j<v.size()-1; j++) {
            ans[v[j]][v[j+1]]=1;
            ans[v[j+1]][v[j]]=1;
        }
    }
    for (auto i: ans) {
        for (int j: i) cout<<j<<" ";
        cout<<"\n";
    }
    build(ans);
    return 1;
}

Compilation message

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:65:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |         for (int j=0; j<v.size()-1; j++) {
      |                       ~^~~~~~~~~~~

Subtask #1
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB secret mismatch
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB secret mismatch
2 Halted 0 ms 0 KB -

Subtask #3
0 / 19.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB secret mismatch
2 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB secret mismatch
2 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB secret mismatch
2 Halted 0 ms 0 KB -

Subtask #6
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB secret mismatch
2 Halted 0 ms 0 KB -