Submission #674579

#	Time	Username	Problem	Language	Result	Execution time	Memory
674579		Nicolas125841	Burza (COCI16_burza)	C++14	0 / 160	2 ms	340 KiB

burza

#include <bits/stdc++.h>
 
using namespace std;
 
#define YES "DA"
#define NO "NE"
 
vector<vector<int>> layers;
vector<int> ways;
unordered_map<int, bitset<400>> coverage;
 
bitset<400> dfs(vector<vector<int>> &mp, int n, int p, int d, int k){
    if(layers.size() == d){
        layers.push_back(vector<int>());
        ways.push_back(0);
    }
 
    if(d == k){
        coverage[n] |= 1;
        coverage[n] <<= layers[d].size();
    }
 
    layers[d].push_back(n);
 
    for(int v : mp[n]){        
        if(v != p){
            bitset<400> res = dfs(mp, v, n, d+1, k);
 
            if(layers.size() > k && d < k)
                coverage[n] |= res;           
        }
    }
 
    if(coverage[n] != 0)
        ways[d]++;

    return coverage[n];
}
 
int main(){
    cin.tie(NULL)->sync_with_stdio(false);
 
    int n, k;
    cin >> n >> k;
 
    vector<vector<int>> mp(n, vector<int>());    
 
    for(int i = 0; i < n-1; i++){
 
        int u, v;
        cin >> u >> v;
 
        mp[--u].push_back(--v);
        mp[v].push_back(u);
 
    }
    
    dfs(mp, 0, -1, 0, k);
    
    if(layers.size() <= k)
        cout << YES << "\n";
    else{
        unordered_map<int, bitset<400>> cur, prev = {{0, bitset<400>()}};
        bool g = false;
 
        for(int i = 1; i <= k; i++){
            for(pair<int, bitset<400>> bs : prev){
                for(int v : layers[i]){
                    if(coverage[v] == 0)
                        continue;

                    if((coverage[v] & bs.second) == 0 && cur[v].size() < (coverage[v] | bs.second).size()){
                        cur[v] = coverage[v] | bs.second;

                        if((coverage[v] | bs.second).count() == layers[k].size())
                            g = true;
                    }                
                }
            }
 
            swap(cur, prev);
            cur.clear();
        }
 
        cout << (g ? YES : NO) << "\n";
    }
 
    
}

Compilation message (stderr)

burza.cpp: In function 'std::bitset<400> dfs(std::vector<std::vector<int> >&, int, int, int, int)':
burza.cpp:13:22: warning: comparison of integer expressions of different signedness: 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   13 |     if(layers.size() == d){
      |        ~~~~~~~~~~~~~~^~~~
burza.cpp:29:30: warning: comparison of integer expressions of different signedness: 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   29 |             if(layers.size() > k && d < k)
      |                ~~~~~~~~~~~~~~^~~
burza.cpp: In function 'int main()':
burza.cpp:60:22: warning: comparison of integer expressions of different signedness: 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   60 |     if(layers.size() <= k)
      |        ~~~~~~~~~~~~~~^~~~

• Subtask 1: 0 / 16
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• Subtask 3: 0 / 16
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• Subtask 10: 0 / 16