oj.uz

Submission #853683

# Submission time Handle Problem Language Result Execution time Memory
853683 2023-09-25T02:51:44 Z ntkphong Connecting Supertrees (IOI20_supertrees) C++14
0 / 100
 1 ms 348 KB 
#include "supertrees.h"
#include <bits/stdc++.h>
using namespace std;

vector<int> par;

int get_root(int u) {
    return par[u] == u ? u : par[u] = get_root(par[u]);
}

bool unite(int u, int v) {
    u = get_root(u);
    v = get_root(v);

    if(u == v) return false;

    par[v] = u;
    return true;
}

int construct(vector<vector<int>> p) {
	int n = p.size();

    par.resize(n);
    for(int i = 0; i < n; i ++) par[i] = i;

    vector<vector<int>> answer(n, vector<int> (n, 0));
    vector<bool> mark(n, false);

    for(int i = 0; i < n; i ++) {
        vector<int> a;

        for(int j = 0; j < n; j ++) {
            if(i == j || p[i][j] != 1) continue ;
            a.push_back(j);
        }

        if(a.empty()) continue ;

        for(int j = 0; j < a.size(); j ++) {
            if(unite(i, a[j])) {
                answer[i][a[j]] = 1;
                answer[a[j]][i] = 1;
            }
        }
    }

    for(int i = 0; i < n; i ++) {
        for(int j = 0; j < n; j ++) {
            if(i != j && p[i][j] == 1) {
                if(get_root(i) != get_root(j))
                    return 0;
            }

            if(i != j && p[i][j] == 0) {
                if(get_root(i) == get_root(j))
                    return 0;
            }
        }
    }

    for(int i = 0; i < n; i ++) {
        if(get_root(i) != i) continue ;

        vector<int> a;

        for(int j = 0; j < n; j ++) {
            if(i == j || p[i][j] != 2) continue ;

            if(mark[j]) return 0;
            a.push_back(j);
        }

        if(a.empty()) continue ;

        vector<int> b;
        b.push_back(i);

        for(int j = 0; j < a.size(); j ++) {
            if(unite(b.back(), a[j])) {
                answer[b.back()][a[j]] = 1;
                answer[a[j]][b.back()] = 1;

                b.push_back(a[j]);
            }
        }

        if(b.size() <= 2) return 0;

        answer[i][b.back()] = 1;
        answer[b.back()][i] = 1;

        for(int j = 0; j < n; j ++) {
            if(get_root(i) == get_root(j)) {
                mark[j] = true;
            }
        }
    }

    for(int i = 0; i < n; i ++) {
        for(int j = 0; j < n; j ++) {
            if(i != j && p[i][j] == 2) {
                if(get_root(i) != get_root(j) || mark[get_root(i)] == false)
                    return 0;
            }

            if(i != j && p[i][j] == 0) {
                if(get_root(i) == get_root(j))
                    return 0;
            }
        }
    }
    
    for(int i = 0; i < n; i ++) {
        for(int j = 0; j < n; j ++) {
            if(p[i][j] == 3) return 0;
        }
    }

	return 1;
}

Compilation message

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:40:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |         for(int j = 0; j < a.size(); j ++) {
      |                        ~~^~~~~~~~~~
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 < a.size(); j ++) {
      |                        ~~^~~~~~~~~~

Subtask #1
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB WA in grader: construct returned 1 without calling build
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB WA in grader: construct returned 1 without calling build
2 Halted 0 ms 0 KB -

Subtask #3
0 / 19.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB WA in grader: construct returned 1 without calling build
2 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 348 KB WA in grader: construct returned 1 without calling build
2 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB WA in grader: construct returned 1 without calling build
2 Halted 0 ms 0 KB -

Subtask #6
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB WA in grader: construct returned 1 without calling build
2 Halted 0 ms 0 KB -