제출 #163103

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
163103		arnold518	Chase (CEOI17_chase)	C++14	0 / 100	1283 ms	524288 KiB

chase

#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);
    }
}

void dfs2(int now, int bef)
{
    int i, j;

    vector<pll> V[MAXK+10];
    for(int nxt : adj[now])
    {
        if(nxt==bef) continue;
        for(i=0; i<=K; i++) V[i].push_back({dp1[nxt][i], nxt});
    }
    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<pii>());

    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;

    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);
    }

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

컴파일 시 표준 에러 (stderr) 메시지

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:57:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(j=0; j<V[i].size(); j++)
                      ~^~~~~~~~~~~~
chase.cpp:63:23: 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:108:12: warning: unused variable 'j' [-Wunused-variable]
     int i, j;
            ^
chase.cpp:110:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &N, &K);
     ~~~~~^~~~~~~~~~~~~~~~
chase.cpp:111:30: 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:115:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &u, &v);
         ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 30