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Submission #163126

# Submission time Handle Problem Language Result Execution time Memory
163126 2019-11-11T13:12:05 Z arnold518 Chase (CEOI17_chase) C++14
50 / 100
 3189 ms 346700 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 1e5;
const int MAXK = 100;

int N, K;
ll P[MAXN+10], S[MAXN+10], dp1[MAXN+10][MAXK+10], dp2[MAXN+10][MAXK+10], ans;
vector<int> adj[MAXN+10];

void dfs1(int now, int bef)
{
    int i, j;
    S[now]+=P[bef];
    for(int nxt : adj[now])
    {
        if(nxt==bef) continue;
        dfs1(nxt, now);
        S[now]+=P[nxt];
    }

    for(i=1; i<=K; i++)
    {
        ll val=0;
        for(int nxt : adj[now])
        {
            if(nxt==bef) continue;
            val=max(val, dp1[nxt][i-1]);
            dp1[now][i]=max(dp1[now][i], dp1[nxt][i]);
        }
        dp1[now][i]=max(dp1[now][i], S[now]-P[bef]+val);
    }
}

vector<pll> V[MAXK+10];
void dfs2(int now, int bef)
{
    int i, j;

    for(i=0; i<=K; i++) V[i].clear();
    for(int nxt : adj[now])
    {
        if(nxt==bef) continue;
        for(i=0; i<=K; i++) V[i].push_back({dp1[nxt][i], nxt});
    }
    if(bef) for(i=0; i<=K; i++) V[i].push_back({dp2[bef][i], bef});
    for(i=0; i<=K; i++) sort(V[i].begin(), V[i].end(), greater<pll>());

    for(int nxt : adj[now])
    {
        if(nxt==bef) continue;
        for(i=1; i<=K; i++)
        {
            for(j=0; j<V[i].size(); j++)
            {
                if(V[i][j].second==nxt) continue;
                dp2[nxt][i]=max(dp2[nxt][i], V[i][j].first);
                break;
            }
            for(j=0; j<V[i-1].size(); j++)
            {
                if(V[i-1][j].second==nxt) continue;
                dp2[nxt][i]=max(dp2[nxt][i], V[i-1][j].first+S[now]-P[nxt]);
                break;
            }
        }
    }

    for(int nxt : adj[now])
    {
        if(nxt==bef) continue;
        dfs2(nxt, now);
    }
}

void dfs3(int now, int bef)
{
    for(int nxt : adj[now])
    {
        if(nxt==bef) continue;
        dfs3(nxt, now);
    }

    ll val1=0, val2=0;
    for(int nxt : adj[now])
    {
        if(nxt==bef) continue;
        val1=max(val1, dp1[nxt][K]);
    }
    val1=max(val1, dp2[now][K]);

    for(int nxt : adj[now])
    {
        if(nxt==bef) continue;
        val2=max(val2, dp1[nxt][K-1]);
    }
    val2=max(val2, dp2[now][K-1]);
    val2+=S[now];

    ans=max({ans, val1, val2});
}

int main()
{
    int i, j, k;

    scanf("%d%d", &N, &K);
    for(i=1; i<=N; i++) scanf("%lld", &P[i]);
    for(i=1; i<N; i++)
    {
        int u, v;
        scanf("%d%d", &u, &v);
        adj[u].push_back(v);
        adj[v].push_back(u);
    }

    if(K==0) return !printf("0");

    dfs1(1, 0);
    dfs2(1, 0);
    dfs3(1, 0);
    printf("%lld", ans);
}

Compilation message

chase.cpp: In function 'void dfs1(int, int)':
chase.cpp:17:12: warning: unused variable 'j' [-Wunused-variable]
     int i, j;
            ^
chase.cpp: In function 'void dfs2(int, int)':
chase.cpp:58:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(j=0; j<V[i].size(); j++)
                      ~^~~~~~~~~~~~
chase.cpp:64:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(j=0; j<V[i-1].size(); j++)
                      ~^~~~~~~~~~~~~~
chase.cpp: In function 'int main()':
chase.cpp:109:12: warning: unused variable 'j' [-Wunused-variable]
     int i, j, k;
            ^
chase.cpp:109:15: warning: unused variable 'k' [-Wunused-variable]
     int i, j, k;
               ^
chase.cpp:111:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &N, &K);
     ~~~~~^~~~~~~~~~~~~~~~
chase.cpp:112:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(i=1; i<=N; i++) scanf("%lld", &P[i]);
                         ~~~~~^~~~~~~~~~~~~~~
chase.cpp:116:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &u, &v);
         ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2680 KB Output is correct
2 Correct 4 ms 2680 KB Output is correct
3 Correct 4 ms 2680 KB Output is correct
4 Correct 4 ms 2680 KB Output is correct
5 Correct 4 ms 2680 KB Output is correct
6 Correct 4 ms 2752 KB Output is correct

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2680 KB Output is correct
2 Correct 4 ms 2680 KB Output is correct
3 Correct 4 ms 2680 KB Output is correct
4 Correct 4 ms 2680 KB Output is correct
5 Correct 4 ms 2680 KB Output is correct
6 Correct 4 ms 2752 KB Output is correct
7 Correct 12 ms 4600 KB Output is correct
8 Incorrect 8 ms 4600 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 853 ms 187320 KB Output is correct
2 Correct 838 ms 187404 KB Output is correct
3 Correct 3189 ms 346700 KB Output is correct
4 Correct 356 ms 179880 KB Output is correct
5 Correct 830 ms 179984 KB Output is correct
6 Correct 852 ms 179832 KB Output is correct
7 Correct 911 ms 179832 KB Output is correct

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2680 KB Output is correct
2 Correct 4 ms 2680 KB Output is correct
3 Correct 4 ms 2680 KB Output is correct
4 Correct 4 ms 2680 KB Output is correct
5 Correct 4 ms 2680 KB Output is correct
6 Correct 4 ms 2752 KB Output is correct
7 Correct 12 ms 4600 KB Output is correct
8 Incorrect 8 ms 4600 KB Output isn't correct
9 Halted 0 ms 0 KB -