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Submission #375902

# Submission time Handle Problem Language Result Execution time Memory
375902 2021-03-10T08:44:00 Z ntabc05101 Cat in a tree (BOI17_catinatree) C++14
100 / 100
 110 ms 18944 KB 
#include<bits/stdc++.h>

const int max_n=200000;

int n, d;
std::vector<int> adjList[5+max_n];

std::pair<int, int> dfs(int vertex, int parent=-1) {
        std::vector< std::pair<int, int> > v;
        for (auto& to: adjList[vertex]) {
                if (to!=parent) {
                        v.push_back(dfs(to, vertex));
                }
        }

        if (v.empty()) {
                return std::make_pair(1, 1);
        }

        std::sort(begin(v), end(v), std::greater< std::pair<int, int> >());
        int pos=1;
        while (pos<v.size() and v[pos].first+v[pos-1].first>=d) ++pos;
        --pos;

        int ret=pos+1;
        for (auto& _: v) ret+=_.second-1;

        if (v.back().first>=d) {
                ++ret;
                return std::make_pair(1, ret);
        }
        
        return std::make_pair(v[pos].first+1, ret);
}

int main() {
        std::ios_base::sync_with_stdio(0); std::cin.tie(0);

        std::cin>>n>>d;
        for (int i=1, x; i<n; ++i) {
                std::cin>>x;
                adjList[x].push_back(i);
        }
        
        std::cout<<dfs(0).second<<"\n";

        return 0;
}

Compilation message

catinatree.cpp: In function 'std::pair<int, int> dfs(int, int)':
catinatree.cpp:22:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |         while (pos<v.size() and v[pos].first+v[pos-1].first>=d) ++pos;
      |                ~~~^~~~~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 4972 KB Output is correct
2 Correct 4 ms 4972 KB Output is correct
3 Correct 4 ms 4972 KB Output is correct
4 Correct 4 ms 4972 KB Output is correct
5 Correct 4 ms 4972 KB Output is correct
6 Correct 4 ms 4972 KB Output is correct
7 Correct 4 ms 4972 KB Output is correct
8 Correct 5 ms 4972 KB Output is correct
9 Correct 4 ms 4972 KB Output is correct
10 Correct 4 ms 4972 KB Output is correct
11 Correct 4 ms 4972 KB Output is correct
12 Correct 4 ms 4972 KB Output is correct
13 Correct 4 ms 4972 KB Output is correct
14 Correct 4 ms 4972 KB Output is correct
15 Correct 4 ms 4972 KB Output is correct
16 Correct 5 ms 4972 KB Output is correct
17 Correct 4 ms 4972 KB Output is correct
18 Correct 4 ms 4972 KB Output is correct
19 Correct 4 ms 4972 KB Output is correct
20 Correct 4 ms 4972 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 4972 KB Output is correct
2 Correct 4 ms 4972 KB Output is correct
3 Correct 4 ms 4972 KB Output is correct
4 Correct 4 ms 4972 KB Output is correct
5 Correct 4 ms 4972 KB Output is correct
6 Correct 4 ms 4972 KB Output is correct
7 Correct 4 ms 4972 KB Output is correct
8 Correct 5 ms 4972 KB Output is correct
9 Correct 4 ms 4972 KB Output is correct
10 Correct 4 ms 4972 KB Output is correct
11 Correct 4 ms 4972 KB Output is correct
12 Correct 4 ms 4972 KB Output is correct
13 Correct 4 ms 4972 KB Output is correct
14 Correct 4 ms 4972 KB Output is correct
15 Correct 4 ms 4972 KB Output is correct
16 Correct 5 ms 4972 KB Output is correct
17 Correct 4 ms 4972 KB Output is correct
18 Correct 4 ms 4972 KB Output is correct
19 Correct 4 ms 4972 KB Output is correct
20 Correct 4 ms 4972 KB Output is correct
21 Correct 4 ms 5228 KB Output is correct
22 Correct 5 ms 5100 KB Output is correct
23 Correct 4 ms 5100 KB Output is correct
24 Correct 4 ms 5100 KB Output is correct
25 Correct 4 ms 5124 KB Output is correct
26 Correct 4 ms 5228 KB Output is correct
27 Correct 4 ms 5100 KB Output is correct
28 Correct 4 ms 5096 KB Output is correct
29 Correct 4 ms 5100 KB Output is correct
30 Correct 4 ms 5100 KB Output is correct
31 Correct 4 ms 5100 KB Output is correct
32 Correct 4 ms 5100 KB Output is correct
33 Correct 4 ms 5100 KB Output is correct
34 Correct 4 ms 5100 KB Output is correct
35 Correct 4 ms 5100 KB Output is correct
36 Correct 4 ms 5100 KB Output is correct
37 Correct 4 ms 5120 KB Output is correct
38 Correct 4 ms 5100 KB Output is correct
39 Correct 4 ms 5100 KB Output is correct
40 Correct 4 ms 5228 KB Output is correct

Subtask #3
49.0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 4972 KB Output is correct
2 Correct 4 ms 4972 KB Output is correct
3 Correct 4 ms 4972 KB Output is correct
4 Correct 4 ms 4972 KB Output is correct
5 Correct 4 ms 4972 KB Output is correct
6 Correct 4 ms 4972 KB Output is correct
7 Correct 4 ms 4972 KB Output is correct
8 Correct 5 ms 4972 KB Output is correct
9 Correct 4 ms 4972 KB Output is correct
10 Correct 4 ms 4972 KB Output is correct
11 Correct 4 ms 4972 KB Output is correct
12 Correct 4 ms 4972 KB Output is correct
13 Correct 4 ms 4972 KB Output is correct
14 Correct 4 ms 4972 KB Output is correct
15 Correct 4 ms 4972 KB Output is correct
16 Correct 5 ms 4972 KB Output is correct
17 Correct 4 ms 4972 KB Output is correct
18 Correct 4 ms 4972 KB Output is correct
19 Correct 4 ms 4972 KB Output is correct
20 Correct 4 ms 4972 KB Output is correct
21 Correct 4 ms 5228 KB Output is correct
22 Correct 5 ms 5100 KB Output is correct
23 Correct 4 ms 5100 KB Output is correct
24 Correct 4 ms 5100 KB Output is correct
25 Correct 4 ms 5124 KB Output is correct
26 Correct 4 ms 5228 KB Output is correct
27 Correct 4 ms 5100 KB Output is correct
28 Correct 4 ms 5096 KB Output is correct
29 Correct 4 ms 5100 KB Output is correct
30 Correct 4 ms 5100 KB Output is correct
31 Correct 4 ms 5100 KB Output is correct
32 Correct 4 ms 5100 KB Output is correct
33 Correct 4 ms 5100 KB Output is correct
34 Correct 4 ms 5100 KB Output is correct
35 Correct 4 ms 5100 KB Output is correct
36 Correct 4 ms 5100 KB Output is correct
37 Correct 4 ms 5120 KB Output is correct
38 Correct 4 ms 5100 KB Output is correct
39 Correct 4 ms 5100 KB Output is correct
40 Correct 4 ms 5228 KB Output is correct
41 Correct 47 ms 10600 KB Output is correct
42 Correct 32 ms 7276 KB Output is correct
43 Correct 39 ms 7276 KB Output is correct
44 Correct 36 ms 7404 KB Output is correct
45 Correct 38 ms 7276 KB Output is correct
46 Correct 110 ms 9636 KB Output is correct
47 Correct 90 ms 9452 KB Output is correct
48 Correct 107 ms 9452 KB Output is correct
49 Correct 101 ms 9580 KB Output is correct
50 Correct 21 ms 5996 KB Output is correct
51 Correct 18 ms 5996 KB Output is correct
52 Correct 24 ms 5996 KB Output is correct
53 Correct 41 ms 6892 KB Output is correct
54 Correct 42 ms 7020 KB Output is correct
55 Correct 42 ms 7296 KB Output is correct
56 Correct 4 ms 5100 KB Output is correct
57 Correct 10 ms 7660 KB Output is correct
58 Correct 40 ms 16876 KB Output is correct
59 Correct 83 ms 18944 KB Output is correct
60 Correct 52 ms 11112 KB Output is correct
61 Correct 66 ms 10220 KB Output is correct