Submission #1039044

#	Time	Username	Problem	Language	Result	Execution time	Memory
1039044		Hanksburger	Cat in a tree (BOI17_catinatree)	C++17	100 / 100	58 ms	20584 KiB

catinatree

#include <bits/stdc++.h>
using namespace std;
vector<int>j[200005];
int n,d,s,x;
int f(int u)
{
    s++;
    vector<int>a(1,0);
    for (int v:j[u])
        a.push_back(f(v)+1);
    sort(a.begin(),a.end());
    int m=0;
    while (m+1<a.size()&&a[m]+a[m+1]<d)
        m++,s--;
    return a[m];
}
int main()
{
    cin>>n>>d;
    for(int i=1;i<n;i++)
        cin>>x,j[x].push_back(i);
    f(0);
    cout<<s;
}

Compilation message (stderr)

catinatree.cpp: In function 'int f(int)':
catinatree.cpp:13:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     while (m+1<a.size()&&a[m]+a[m+1]<d)
      |            ~~~^~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 40 / 40
• Subtask 3: 49 / 49