oj.uz

Submission #720651

# Submission time Handle Problem Language Result Execution time Memory
720651 2023-04-08T19:26:05 Z Toxtaq Connecting Supertrees (IOI20_supertrees) C++17
11 / 100
 200 ms 22488 KB 
#ifndef SUPERTREES_H_INCLUDED
#define SUPERTREES_H_INCLUDED
#include "supertrees.h"
#include<bits/stdc++.h>
using namespace std;
struct DSU{
    vector<int>par;
    vector<vector<int>>parV;
    DSU(int n){
        par.assign(n, -1);
        parV.resize(n);
        for(int i = 0;i < n;++i)parV[i].push_back(i);
    }
    int FindRep(int u){
        if(par[u] < 0)return u;
        return par[u] = FindRep(par[u]);
    }
    void Union(int u, int v){
        u = FindRep(u);
        v = FindRep(v);
        if(u == v)return;
        if(par[u] > par[v])swap(u, v);
        par[u] += par[v];
        par[v] = u;
        for(int i : parV[v]){
            parV[u].push_back(i);
        }
    }
    bool IsConnected(int u, int v){
        u = FindRep(u);
        v = FindRep(v);
        return (u == v);
    }
};
void build(vector<vector<int>>b);
int construct(vector<vector<int>>p){
    int n = p.size();
    vector<vector<int>>ans(n, vector<int>(n));
    DSU dsu1(n);
    for(int i = 0;i < n;++i){
        for(int j = 0;j < n;++j){
            if(i != j && p[i][j])dsu1.Union(i, j);
        }
    }
    vector<bool>chosen(n);
    for(int i = 0;i < n;++i){
        if(chosen[i])continue;
        vector<int>components, ones, twos;
        swap(components, dsu1.parV[dsu1.FindRep(i)]);
        for(int j : components){
            chosen[j] = 1;
            int cnt = 0;
            for(int z = 0;z < n;++z){
                if(p[j][z] == 1){
                    cnt++;
                }
            }
            if(cnt == 1)twos.push_back(j);
            else ones.push_back(j);
        }
//        cout << i << ": \n";
//        cout << "ones: ";
//        for(int j : ones)cout << j << " ";
//        cout << "\ntwos: ";
//        for(int j : twos)cout << j << " ";
//        cout << '\n';
        for(int j = 1;j < ones.size();++j){
            ans[ones[j - 1]][ones[j]] = 1;
            ans[ones[j]][ones[j - 1]] = 1;
        }
        for(int j = 1;j < twos.size();++j){
            ans[twos[j - 1]][twos[j]] = 1;
            ans[twos[j]][twos[j - 1]] = 1;
        }
        if(!ones.size() && twos.size()){
            if(twos.size() > 1)ans[twos[0]][twos.back()] = ans[twos.back()][twos[0]] = 1;
        }
        else if(ones.size() && twos.size()){
            ans[ones.back()][twos[0]] = 1;
            ans[twos[0]][ones.back()] = 1;
            ans[twos.back()][ones.back()] = 1;
            ans[ones.back()][twos.back()] = 1;
        }
    }
    build(ans);
    return 1;
}


#endif // SUPERTREES_H_INCLUDED

Compilation message

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:67:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |         for(int j = 1;j < ones.size();++j){
      |                       ~~^~~~~~~~~~~~~
supertrees.cpp:71:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |         for(int j = 1;j < twos.size();++j){
      |                       ~~^~~~~~~~~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 300 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 8 ms 1224 KB Output is correct
7 Correct 191 ms 22336 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 300 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 8 ms 1224 KB Output is correct
7 Correct 191 ms 22336 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 8 ms 1236 KB Output is correct
13 Correct 195 ms 22352 KB Output is correct
14 Incorrect 1 ms 212 KB Answer gives possible 1 while actual possible 0
15 Halted 0 ms 0 KB -

Subtask #3
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Incorrect 1 ms 212 KB Answer gives possible 1 while actual possible 0
5 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 60 ms 6016 KB Output is correct
5 Correct 169 ms 22288 KB Output is correct
6 Correct 177 ms 22476 KB Output is correct
7 Correct 177 ms 22348 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 43 ms 6036 KB Output is correct
10 Correct 163 ms 22288 KB Output is correct
11 Correct 200 ms 22488 KB Output is correct
12 Correct 172 ms 22316 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Incorrect 44 ms 6004 KB Too few ways to get from 0 to 24, should be 2 found 1
17 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 300 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 8 ms 1224 KB Output is correct
7 Correct 191 ms 22336 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 8 ms 1236 KB Output is correct
13 Correct 195 ms 22352 KB Output is correct
14 Incorrect 1 ms 212 KB Answer gives possible 1 while actual possible 0
15 Halted 0 ms 0 KB -

Subtask #6
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 300 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 8 ms 1224 KB Output is correct
7 Correct 191 ms 22336 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 8 ms 1236 KB Output is correct
13 Correct 195 ms 22352 KB Output is correct
14 Incorrect 1 ms 212 KB Answer gives possible 1 while actual possible 0
15 Halted 0 ms 0 KB -