Submission #481312

#	Time	Username	Problem	Language	Result	Execution time	Memory
481312		DJeniUp	Cat in a tree (BOI17_catinatree)	C++17	0 / 100	1 ms	332 KiB

catinatree

#pragma GCC Optimize("O3")
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll,ll>pairll;
typedef pair<ll,pairll>pairlll;
typedef pair<pairll,pairll>pairllll;
typedef long double ld;
typedef pair<ll,string>pairls;

#define INF 1000000000000007
#define MOD 1000000007
#define pb push_back
#define fr first
#define sc second
#define endl '\n'

ll n,m,t[1507][1507],res;

vector<ll>v[1507];

void S(ll x,ll y){

    for(int i=0;i<v[x].size();i++){
        if(v[x][i]!=y)S(v[x][i],x);
    }
    t[x][0]=1;
    for(int i=0;i<v[x].size();i++){
        if(v[x][i]!=y)t[x][0]+=t[v[x][i]][m-1];
    }
    for(int i=1;i<m;i++){
        if(i*2<m){
            t[x][i]=0;
            ll h=0;
            for(int j=0;j<v[x].size();j++){
                if(v[x][j]!=y)h+=t[v[x][j]][m-i-1];
            }
            for(int j=0;j<v[x].size();j++){
                if(v[x][j]!=y){
                    t[x][i]=max(t[x][i],h-t[v[x][j]][m-i-1]+t[v[x][j]][i-1]);
                }
            }
        }
    }
    return ;
}

int main() {
    
    cin>>n>>m;
    for(int i=1;i<n;i++){
        ll l;
        cin>>l;
        v[l].pb(i);
        v[i].pb(l);
    }
    S(0,0);
    res=0;
    for(int i=0;i<m;i++){
        res=max(res,t[0][i]);
    }
    cout<<res<<endl;
}

Compilation message (stderr)

catinatree.cpp:1: warning: ignoring '#pragma GCC Optimize' [-Wunknown-pragmas]
    1 | #pragma GCC Optimize("O3")
      | 
catinatree.cpp: In function 'void S(ll, ll)':
catinatree.cpp:27:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for(int i=0;i<v[x].size();i++){
      |                 ~^~~~~~~~~~~~
catinatree.cpp:31:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |     for(int i=0;i<v[x].size();i++){
      |                 ~^~~~~~~~~~~~
catinatree.cpp:38:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |             for(int j=0;j<v[x].size();j++){
      |                         ~^~~~~~~~~~~~
catinatree.cpp:41:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |             for(int j=0;j<v[x].size();j++){
      |                         ~^~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 40
• Subtask 3: 0 / 49