oj.uz

답안 #578538

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
578538 2022-06-17T08:15:31 Z andrei_boaca Chase (CEOI17_chase) C++14
40 / 100
 297 ms 524288 KB 
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
ll n,v,p[100005],par[100005],dp[100005][105];
vector<ll> muchii[100005];
ll ans=0,s[100005];
ll MAXROOT=1;
bool use[100005];
vector<vector<multiset<ll>>> vals;
void dfs(int nod)
{
    for(int i=1;i<=v;i++)
        dp[nod][i]=0;
    ll suma=0;
    int cnt=0;
    for(int i:muchii[nod])
        if(i!=par[nod])
        {
            suma+=p[i];
            par[i]=nod;
            cnt++;
            dfs(i);
            for(int j=1;j<=v;j++)
                vals[nod][j].insert(dp[i][j]);
        }
    s[nod]=suma;
    for(int j=1;j<=v;j++)
    {
        dp[nod][j]=dp[nod][j-1];
        for(int i:muchii[nod])
            if(i!=par[nod])
            {
                dp[nod][j]=max(dp[nod][j],dp[i][j]);
                dp[nod][j]=max(dp[nod][j],dp[i][j-1]+s[nod]);
            }
    }
}
void calcdp(int nod,int j)
{
    dp[nod][j]=0;
    if(vals[nod][j].empty())
        return;
    ll x=*prev(vals[nod][j].end());
    ll y=s[nod];
    if(j>1)
        y=*prev(vals[nod][j-1].end())+s[nod];
    dp[nod][j]=max(x,y);
}
void reroot(int nod,int fiu)
{
    s[nod]-=p[fiu];
    s[fiu]+=p[nod];
    par[nod]=fiu;
    par[fiu]=0;
    for(int j=1;j<=v;j++)
        vals[nod][j].erase(vals[nod][j].find(dp[fiu][j]));
    for(int j=1;j<=v;j++)
        calcdp(nod,j);
    for(int j=1;j<=v;j++)
        vals[fiu][j].insert(dp[nod][j]);
    for(int j=1;j<=v;j++)
        calcdp(fiu,j);
}
void calc(int nod)
{
    use[nod]=1;
    ans=max(ans,dp[nod][v]);
    for(int i:muchii[nod])
        if(i!=par[nod]&&!use[i])
        {
            reroot(nod,i);
            calc(i);
            reroot(i,nod);
        }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin>>n>>v;
    for(int i=1;i<=n;i++)
        cin>>p[i];
    vals.resize(n+1);
    for(int i=0;i<=n;i++)
        vals[i].resize(v+1);
    for(int i=1;i<n;i++)
    {
        int a,b;
        cin>>a>>b;
        muchii[a].push_back(b);
        muchii[b].push_back(a);
    }
    dfs(1);
    calc(1);
    cout<<ans;
    return 0;
}

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 31 ms 13064 KB Output is correct
8 Correct 4 ms 4180 KB Output is correct
9 Correct 5 ms 4052 KB Output is correct
10 Correct 29 ms 13064 KB Output is correct
11 Correct 12 ms 6424 KB Output is correct
12 Correct 5 ms 4436 KB Output is correct

Subtask #3
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 297 ms 524288 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 31 ms 13064 KB Output is correct
8 Correct 4 ms 4180 KB Output is correct
9 Correct 5 ms 4052 KB Output is correct
10 Correct 29 ms 13064 KB Output is correct
11 Correct 12 ms 6424 KB Output is correct
12 Correct 5 ms 4436 KB Output is correct
13 Runtime error 297 ms 524288 KB Execution killed with signal 9
14 Halted 0 ms 0 KB -