oj.uz

Submission #674681

# Submission time Handle Problem Language Result Execution time Memory
674681 2022-12-25T19:02:13 Z Nicolas125841 Burza (COCI16_burza) C++14
144 / 160
 1000 ms 15700 KB 
#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_set<bitset<400>> cur, prev = {bitset<400>()};
        bool g = false;
 
        for(int i = 1; i <= k; i++){
            for(bitset<400> bs : prev){
                for(int v : layers[i]){
                    if(coverage[v] == 0 || (coverage[v].count() == 1 && layers[k].size()-bs.count() > (k-1)+1))
                        continue;

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

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

Compilation message

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)
      |        ~~~~~~~~~~~~~~^~~~
burza.cpp:69:101: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   69 |                     if(coverage[v] == 0 || (coverage[v].count() == 1 && layers[k].size()-bs.count() > (k-1)+1))
      |                                                                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~

Subtask #1
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 31 ms 852 KB Output is correct
2 Correct 267 ms 4776 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 299 ms 2616 KB Output is correct
6 Correct 1 ms 340 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 273 ms 4684 KB Output is correct
2 Correct 275 ms 4732 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 132 ms 2492 KB Output is correct
6 Correct 89 ms 1004 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 293 ms 4740 KB Output is correct
2 Correct 271 ms 4764 KB Output is correct
3 Correct 1 ms 320 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 382 ms 4436 KB Output is correct
6 Correct 0 ms 340 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 58 ms 1612 KB Output is correct
2 Correct 265 ms 4664 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 16 ms 564 KB Output is correct
6 Correct 1 ms 340 KB Output is correct

Subtask #5
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 301 ms 4788 KB Output is correct
2 Correct 260 ms 4764 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 320 KB Output is correct
5 Execution timed out 1092 ms 15700 KB Time limit exceeded
6 Halted 0 ms 0 KB -

Subtask #6
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 258 ms 4760 KB Output is correct
2 Correct 270 ms 4668 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 7 ms 340 KB Output is correct
6 Correct 36 ms 724 KB Output is correct

Subtask #7
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 271 ms 4656 KB Output is correct
2 Correct 268 ms 4828 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 122 ms 2436 KB Output is correct
6 Correct 605 ms 7092 KB Output is correct

Subtask #8
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 63 ms 1512 KB Output is correct
2 Correct 270 ms 4764 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 9 ms 452 KB Output is correct
6 Correct 10 ms 456 KB Output is correct

Subtask #9
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 852 KB Output is correct
2 Correct 261 ms 4736 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 316 KB Output is correct
5 Correct 37 ms 724 KB Output is correct
6 Correct 469 ms 5004 KB Output is correct

Subtask #10
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 117 ms 2556 KB Output is correct
2 Correct 271 ms 4668 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 57 ms 1408 KB Output is correct
6 Correct 1 ms 340 KB Output is correct