oj.uz

Submission #867379

# Submission time Handle Problem Language Result Execution time Memory
867379 2023-10-28T09:55:05 Z 3as8 Logičari (COCI21_logicari) C++14
20 / 110
 30 ms 7716 KB 
#include <bits/stdc++.h>

#define ll long long
#define endl "\n"
#define fastIO cin.tie(nullptr); cout.tie(nullptr); ios::sync_with_stdio(false);

#define mid ((l + r) / 2)
#define lChild ((index * 2) + 1)
#define rChild ((index * 2) + 2)

using namespace std;

ll dfs(vector<vector<ll> >& graph, vector<bool>& visited, vector<ll>& blues, vector<bool>& isBlue, ll numBlues, ll numVis, ll startIndex) {



    if(numVis == graph.size()) {

        for(auto el : isBlue) cout<<el<<" ";
        cout<<" => "<<numBlues<<endl;
        for(auto el : visited) cout<<el<<" ";
        cout<<endl;
        for(auto el : blues) cout<<el<<" ";
        cout<<endl;
        cout<<"====="<<endl;


        for(auto el : blues) if(el != 1) return LLONG_MAX;

        return numBlues;
    }

    visited[startIndex] = true;

    bool canBlue = true;
    for(auto el : graph[startIndex]) {
        cout<<blues[el]<<" ";
        canBlue &= blues[el] == 0;
    }

    cout<<" => "<<canBlue<<endl;
    ll ans = LLONG_MAX;
    for(auto el : graph[startIndex]) {
        if(visited[el]) continue;

        ans = min(ans, dfs(graph, visited, blues, isBlue, numBlues, numVis + 1, el));
    }

    if(!canBlue) {
        visited[startIndex] = false;
        return ans;
    }

    for(auto el : graph[startIndex]) blues[el]++;

    for(auto el : graph[startIndex]) {
        if(visited[el]) continue;

        ans = min(ans, dfs(graph, visited, blues, isBlue, numBlues + 1, numVis + 1, el));
    }

    for(auto el : graph[startIndex]) blues[el]--;

    visited[startIndex] = false;

    return ans;

}

bool check(ll bls,  vector<vector<ll> >& graph) {


    for(int i = 0; i < graph.size(); i++) {
        ll blues = 0;
        for(auto el : graph[i]) {
          //  cout<<bls<<" "<<(1 << el)<<endl;
            blues += (bls & (1 << el)) > 0;
        }
        if(blues != 1) return false;
    }

    return true;
}

void solve(ll _) {
    ll n; cin>>n;
    vector<vector<ll> > graph(n);
    vector<ll> blues(n, 0);
    vector<bool> isBlue(n, false);
    vector<bool> visited(n, false);

    vector<ll> degree(n, 0);
    for(int i = 0; i < n; i++) {
        ll x, y; cin>>x>>y;
        x--; y--;

        degree[x]++; degree[y]++;

        graph[x].push_back(y);
        graph[y].push_back(x);
    }

    bool sub1 = true;
    for(auto el : degree) sub1 &= (el == 2);

    if(sub1) {
        if (n % 4 != 0) cout << -1 << endl;
        else cout << n / 2 << endl;
        return;
    }

    ll num = 0;

    ll ans = LLONG_MAX;
    for(int i = 0; i < (1<<n); i++) {
        if(check(i, graph)) ans = min(ans, (ll)__builtin_popcountll(i));
    }

    cout<<(ans == LLONG_MAX ? -1 : ans)<<endl;

    //cout<<dfs(graph, visited,blues, isBlue,0,  1 , 0)<<endl;

}

int main() {
    fastIO

    //freopen("file.in", "r", stdin);
    //freopen("file.out", "w", stdout);

    ll t = 0;  solve(t);
}

Compilation message

Main.cpp: In function 'long long int dfs(std::vector<std::vector<long long int> >&, std::vector<bool>&, std::vector<long long int>&, std::vector<bool>&, long long int, long long int, long long int)':
Main.cpp:17:15: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     if(numVis == graph.size()) {
      |        ~~~~~~~^~~~~~~~~~~~~~~
Main.cpp: In function 'bool check(long long int, std::vector<std::vector<long long int> >&)':
Main.cpp:73:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |     for(int i = 0; i < graph.size(); i++) {
      |                    ~~^~~~~~~~~~~~~~
Main.cpp: In function 'void solve(long long int)':
Main.cpp:112:8: warning: unused variable 'num' [-Wunused-variable]
  112 |     ll num = 0;
      |        ^~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 23 ms 7488 KB Output is correct
6 Correct 23 ms 7516 KB Output is correct
7 Correct 23 ms 7408 KB Output is correct
8 Correct 30 ms 7716 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 348 KB Output is correct
2 Correct 6 ms 348 KB Output is correct
3 Correct 6 ms 412 KB Output is correct
4 Correct 7 ms 348 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 3 ms 452 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 13 ms 348 KB Output is correct
10 Correct 8 ms 344 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 8 ms 448 KB Output is correct

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 348 KB Output is correct
2 Correct 6 ms 348 KB Output is correct
3 Correct 6 ms 412 KB Output is correct
4 Correct 7 ms 348 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 3 ms 452 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 13 ms 348 KB Output is correct
10 Correct 8 ms 344 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 8 ms 448 KB Output is correct
13 Incorrect 1 ms 348 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #4
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 23 ms 7488 KB Output is correct
6 Correct 23 ms 7516 KB Output is correct
7 Correct 23 ms 7408 KB Output is correct
8 Correct 30 ms 7716 KB Output is correct
9 Correct 8 ms 348 KB Output is correct
10 Correct 6 ms 348 KB Output is correct
11 Correct 6 ms 412 KB Output is correct
12 Correct 7 ms 348 KB Output is correct
13 Correct 0 ms 344 KB Output is correct
14 Correct 3 ms 452 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 13 ms 348 KB Output is correct
18 Correct 8 ms 344 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 8 ms 448 KB Output is correct
21 Incorrect 1 ms 348 KB Output isn't correct
22 Halted 0 ms 0 KB -