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답안 #469107

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
469107 2021-08-30T18:13:51 Z Josia Chase (CEOI17_chase) C++14
40 / 100
 4000 ms 491896 KB 
#pragma GCC optimize("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2")
    
#include <bits/stdc++.h>
#define int long long
#define rep(i,n) for(int i = 0; i < n; i++)
    
using namespace std;
    
int n,v;
vector<int>p;
vector<vector<int>>mem;
vector<vector<signed>>E;
 
signed takei[100001][101];
signed notakei[100001][101];
int takemaxx[100001][101];
int notakemaxx[100001][101];
int takealtmaxx[100001][101];
int notakealtmaxx[100001][101];
 
 
int dfs(int pos, int bc, int parent)
{
    if(parent!=-1&&mem[pos][bc]!=-1) return mem[pos][bc];
    if(bc==0) return 0;
    
        
    int sum = 0;
    for(int w : E[pos])
    {
        if(w==parent) continue;
        sum+=p[w];
    }
 
    int maxx = 0;
    takemaxx[pos][bc]=0;
    takei[pos][bc] = -1;
    notakemaxx[pos][bc]=0;
    notakei[pos][bc] = -1;
 
    int t, nt;
    for(int w : E[pos])
    {
        if(w==parent) continue;
        nt = dfs(w, bc, pos);
        t = dfs(w, bc-1, pos) + sum;
 
        if(nt>notakemaxx[pos][bc])
        {
            notakei[pos][bc] = w;
            notakemaxx[pos][bc] = nt;
        }
 
        if(t>takemaxx[pos][bc])
        {
            takei[pos][bc] = w;
            takemaxx[pos][bc] = t;
        }
 
        maxx=max(maxx, nt);
        maxx=max(maxx, t);
    }
 
    takealtmaxx[pos][bc]  = 0;
    notakealtmaxx[pos][bc]=0;
 
    for(int w : E[pos])
    {
        if(w==parent) continue;
        nt = dfs(w, bc, pos);
        t = dfs(w, bc-1, pos) + sum;
        if(takei[pos][bc]!=-1&&takei[pos][bc]!=w)
        {
            takealtmaxx[pos][bc]=max(takealtmaxx[pos][bc], t);
        }
        if(notakei[pos][bc]!=-1&&notakei[pos][bc]!=w)
        {
            notakealtmaxx[pos][bc]=max(notakealtmaxx[pos][bc], nt);
        }
    }
 
    return mem[pos][bc] = maxx;
}
    
int bruteforce()
{
    int maxx=0;
    rep(i, n) 
    {
        mem.assign(n+1, vector<int>(v+1, -1));
        maxx=max(maxx, dfs(i+1, v, -1));
    }
    return maxx;
}
 
int mx=0;
void meta_dfs(int pos, int parent)
{
    rep(i, v+1) mx = max(mx, dfs(pos, i, -1));
    for(int w : E[pos])
    {
        if(w==parent) continue;
        for(int i = 1; i<= v; i++)
        {
            mem[pos][i] = 0;
            if(takei[pos][i]!=w) mem[pos][i] = max(mem[pos][i], takemaxx[pos][i]-p[w]);
            else mem[pos][i] = max(mem[pos][i], takealtmaxx[pos][i]-p[w]);
            if(notakei[pos][i]!=w) mem[pos][i] = max(mem[pos][i], notakemaxx[pos][i]);
            else mem[pos][i] = max(mem[pos][i], notakealtmaxx[pos][i]);
        }
        meta_dfs(w,pos);
    }
}

 
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
 
    cin>>n>>v;
    p.resize(n+1);
    rep(i, n) cin>>p[i+1];
    
    E.resize(n+1);
    
    rep(i,n-1)
    {
        signed a,b;
        cin>>a>>b;
        E[a].push_back(b);
        E[b].push_back(a);
    }

    mem.assign(n+1, vector<int>(v+1, -1));
    
 
    meta_dfs(1, -1);
    cout<<mx<<"\n";
}

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 332 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 13 ms 5268 KB Output is correct
8 Correct 3 ms 4428 KB Output is correct
9 Correct 3 ms 4428 KB Output is correct
10 Correct 14 ms 5068 KB Output is correct
11 Correct 6 ms 4556 KB Output is correct
12 Correct 4 ms 4428 KB Output is correct

Subtask #3
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3831 ms 491896 KB Output is correct
2 Correct 3883 ms 491852 KB Output is correct
3 Correct 1761 ms 484464 KB Output is correct
4 Correct 303 ms 407436 KB Output is correct
5 Execution timed out 4132 ms 484052 KB Time limit exceeded
6 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 13 ms 5268 KB Output is correct
8 Correct 3 ms 4428 KB Output is correct
9 Correct 3 ms 4428 KB Output is correct
10 Correct 14 ms 5068 KB Output is correct
11 Correct 6 ms 4556 KB Output is correct
12 Correct 4 ms 4428 KB Output is correct
13 Correct 3831 ms 491896 KB Output is correct
14 Correct 3883 ms 491852 KB Output is correct
15 Correct 1761 ms 484464 KB Output is correct
16 Correct 303 ms 407436 KB Output is correct
17 Execution timed out 4132 ms 484052 KB Time limit exceeded
18 Halted 0 ms 0 KB -