oj.uz

답안 #1026225

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1026225 2024-07-17T17:56:07 Z ShaShi Chase (CEOI17_chase) C++17
20 / 100
 620 ms 482368 KB 
#include <bits/stdc++.h>
 
#define int long long

// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
 
#define F first
#define S second
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()
#define kill(x) cout << x << "\n", exit(0)
#define pii pair<int, int>
#define endl "\n"


 
 
using namespace std;
typedef long long ll;
typedef long double ld;
 

const int MAXN = (int)1e5 + 7;
const int MOD = (int)1e9 + 7;
const int INF = (int)1e9 + 7;
const int SQ = 107;



int n, m, t, k, tmp, tmp2, tmp3, tmp4, flag, u, v, w, ans;
int arr[MAXN], dp[MAXN][SQ], dp2[MAXN][SQ], sum[MAXN];
int ps[SQ][2][MAXN], pd[SQ][MAXN], ps2[SQ][2][MAXN], pd2[SQ][MAXN];
vector<int> adj[MAXN], vec[MAXN];




void DFSsz(int v, int p=-1) {
    for (int u:adj[v]) {
        if (u == p) continue;

        DFSsz(u, v);

        sum[v] += arr[u]; vec[v].pb(u);
    }

    for (int j=1; j<=k; j++) {
        for (int u:vec[v]) {
            dp[v][j] = max({dp[v][j], max(dp[u][j], dp2[u][j])});
            dp2[v][j] = max({dp2[v][j], max(dp[u][j-1], dp2[u][j-1])+sum[v]});
        }
    }

    for (int j=1; j<=k; j++) {
        ps[j][0][0] = ps[j][1][vec[v].size()+1] = ps2[j][0][0] = ps2[j][1][vec[v].size()+1] = 0;

        for (int i=1; i<=vec[v].size(); i++) {
            int u = vec[v][i-1];

            ps[j][0][i] = max(ps[j][0][i-1], max(dp[u][j], dp2[u][j]));
            ps2[j][0][i] = max(ps2[j][0][i-1], max(dp[u][j-1], dp2[u][j-1]));
        }

        for (int i=vec[v].size(); i>=1; i--) {
            int u = vec[v][i-1];

            ps[j][1][i] = max(ps[j][1][i+1], max(dp[u][j], dp2[u][j]));
            ps2[j][1][i] = max(ps2[j][1][i+1], max(dp[u][j-1], dp2[u][j-1]));
        }

        for (int i=1; i<=vec[v].size(); i++) {
            int u = vec[v][i-1];

            pd[j][u] = max({ps[j][0][i-1], ps[j][1][i+1]});
            pd2[j][u] = max(ps2[j][0][i-1], ps2[j][1][i+1])+sum[v]-arr[u];
        }
    }
}



void Walk(int v, int p, vector<int> mul) {
    for (int j=1; j<=k; j++) ans = max({ans, max(dp[v][j], dp2[v][j]+arr[p]), mul[j], mul[j-1]+sum[v]+arr[p]});

    // cout << "! " << v << " " << merge(dp[v], mul).F << " " << merge(dp[v], mul).S << endl;

    for (int u:adj[v]) {
        if (u == p) continue;

        vector<int> mul2(k+1);
        for (int j=0; j<=k; j++) mul2[j] = max({mul[j], pd[j][u], pd2[j][u]+arr[p]});
        
        Walk(u, v, mul2);
    }
}


int32_t main() {
    #ifdef LOCAL
    freopen("inp.in", "r", stdin);
    freopen("res.out", "w", stdout);
    #else
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #endif


    cin >> n >> k;

    for (int i=1; i<=n; i++) cin >> arr[i];

    for (int i=1; i<n; i++) {
        cin >> u >> v;

        adj[u].pb(v); adj[v].pb(u);
    }

    DFSsz(1);
    Walk(1, 0, vector<int>(k+1, 0));


    cout << ans << endl;


    return 0;
}

Compilation message

chase.cpp: In function 'void DFSsz(long long int, long long int)':
chase.cpp:60:24: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |         for (int i=1; i<=vec[v].size(); i++) {
      |                       ~^~~~~~~~~~~~~~~
chase.cpp:74:24: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |         for (int i=1; i<=vec[v].size(); i++) {
      |                       ~^~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 5212 KB Output is correct
2 Correct 2 ms 5212 KB Output is correct
3 Correct 2 ms 5212 KB Output is correct
4 Correct 4 ms 5468 KB Output is correct
5 Correct 2 ms 4956 KB Output is correct
6 Correct 2 ms 5212 KB Output is correct

Subtask #2
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 5212 KB Output is correct
2 Correct 2 ms 5212 KB Output is correct
3 Correct 2 ms 5212 KB Output is correct
4 Correct 4 ms 5468 KB Output is correct
5 Correct 2 ms 4956 KB Output is correct
6 Correct 2 ms 5212 KB Output is correct
7 Correct 7 ms 11868 KB Output is correct
8 Incorrect 3 ms 6492 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #3
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 610 ms 343632 KB Output is correct
2 Correct 620 ms 343020 KB Output is correct
3 Correct 474 ms 482368 KB Output is correct
4 Incorrect 124 ms 153684 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 5212 KB Output is correct
2 Correct 2 ms 5212 KB Output is correct
3 Correct 2 ms 5212 KB Output is correct
4 Correct 4 ms 5468 KB Output is correct
5 Correct 2 ms 4956 KB Output is correct
6 Correct 2 ms 5212 KB Output is correct
7 Correct 7 ms 11868 KB Output is correct
8 Incorrect 3 ms 6492 KB Output isn't correct
9 Halted 0 ms 0 KB -