oj.uz

Submission #35836

# Submission time Handle Problem Language Result Execution time Memory
35836 2017-12-01T09:50:26 Z funcsr Chase (CEOI17_chase) C++14
100 / 100
 493 ms 290376 KB 
#include <cstdio>
#include <iostream>
#include <algorithm>
#include <string>
#include <cstring>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <cmath>
#include <iomanip>
#include <cassert>
#include <bitset>
using namespace std;

typedef pair<int, int> P;
#define rep(i, n) for (int i=0; i<(n); i++)
#define all(c) (c).begin(), (c).end()
#define uniq(c) c.erase(unique(all(c)), (c).end())
#define index(xs, x) (int)(lower_bound(all(xs), x) - xs.begin())
#define _1 first
#define _2 second
#define pb push_back
#define INF 1145141919
#define MOD 1000000007
inline void chmax(long long &x, long long v) { if (x < v) x = v; }

int N, K;
int A[100001];
long long T[100000];
vector<int> G[100000];

long long down[100000][101];
long long dp[100000][101][2];
int to[100000][101];

void f(int x, int p) {
  for (int t : G[x]) {
    if (t == p) continue;
    f(t, x);
    rep(k, K+1) chmax(down[x][k], down[t][k]);
    if (p != -1) rep(k, K) chmax(down[x][k+1], down[t][k]+T[x]-A[p]);
  }
}

inline void update(int x, int k, long long val, int t) {
  if (val > dp[x][k][0]) {
    if (t == to[x][k]) dp[x][k][0] = val;
    else {
      dp[x][k][1] = dp[x][k][0];
      dp[x][k][0] = val;
      to[x][k] = t;
    }
  }
  else if (val > dp[x][k][1]) {
    dp[x][k][1] = val;
  }
}

void g(int x, int p) {
  if (p != -1) {
    rep(k, K+1) {
      long long m = 0;
      int s = 0;
      if (to[p][k] == x) s++;
      update(x, k, dp[p][k][s], p);
      if (k < K) update(x, k+1, dp[p][k][s] + T[p] - A[x], p);
    }
  }
  for (int t : G[x]) {
    if (t == p) continue;
    rep(k, K+1) update(x, k, down[t][k], t);
  }

  for (int t : G[x]) {
    if (t == p) continue;
    g(t, x);
  }
}

signed main() {
  ios::sync_with_stdio(false); cin.tie(0);
  cin >> N >> K;
  if (K == 0) {
    cout << 0 << "\n";
    return 0;
  }
  rep(i, N) cin >> A[i];
  rep(i, N-1) {
    int u, v;
    cin >> u >> v;
    u--, v--;
    G[u].pb(v);
    G[v].pb(u);
  }
  rep(i, N) for (int t : G[i]) T[i] += A[t];
  rep(i, N) rep(j, K+1) to[i][j] = -1;

  f(0, -1);
  g(0, -1);
  long long m = 0;
  rep(i, N) {
    chmax(m, dp[i][K][0]);
    chmax(m, dp[i][K-1][0] + T[i]);
  }
  cout << m << "\n";
  return 0;
}

Compilation message

chase.cpp: In function 'void g(int, int)':
chase.cpp:63:17: warning: unused variable 'm' [-Wunused-variable]
       long long m = 0;
                 ^

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 281864 KB Output is correct
2 Correct 0 ms 281864 KB Output is correct
3 Correct 0 ms 281864 KB Output is correct
4 Correct 0 ms 281864 KB Output is correct
5 Correct 0 ms 281864 KB Output is correct
6 Correct 0 ms 281864 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 281864 KB Output is correct
2 Correct 0 ms 281864 KB Output is correct
3 Correct 0 ms 281864 KB Output is correct
4 Correct 0 ms 281864 KB Output is correct
5 Correct 0 ms 281864 KB Output is correct
6 Correct 0 ms 281864 KB Output is correct
7 Correct 0 ms 281864 KB Output is correct
8 Correct 3 ms 281864 KB Output is correct
9 Correct 0 ms 281864 KB Output is correct
10 Correct 3 ms 281864 KB Output is correct
11 Correct 0 ms 281864 KB Output is correct
12 Correct 0 ms 281864 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 319 ms 290328 KB Output is correct
2 Correct 319 ms 290300 KB Output is correct
3 Correct 199 ms 285416 KB Output is correct
4 Correct 213 ms 285032 KB Output is correct
5 Correct 476 ms 285032 KB Output is correct
6 Correct 406 ms 285032 KB Output is correct
7 Correct 446 ms 285032 KB Output is correct

Subtask #4
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 281864 KB Output is correct
2 Correct 0 ms 281864 KB Output is correct
3 Correct 0 ms 281864 KB Output is correct
4 Correct 0 ms 281864 KB Output is correct
5 Correct 0 ms 281864 KB Output is correct
6 Correct 0 ms 281864 KB Output is correct
7 Correct 0 ms 281864 KB Output is correct
8 Correct 3 ms 281864 KB Output is correct
9 Correct 0 ms 281864 KB Output is correct
10 Correct 3 ms 281864 KB Output is correct
11 Correct 0 ms 281864 KB Output is correct
12 Correct 0 ms 281864 KB Output is correct
13 Correct 319 ms 290328 KB Output is correct
14 Correct 319 ms 290300 KB Output is correct
15 Correct 199 ms 285416 KB Output is correct
16 Correct 213 ms 285032 KB Output is correct
17 Correct 476 ms 285032 KB Output is correct
18 Correct 406 ms 285032 KB Output is correct
19 Correct 446 ms 285032 KB Output is correct
20 Correct 423 ms 285032 KB Output is correct
21 Correct 0 ms 281864 KB Output is correct
22 Correct 433 ms 285032 KB Output is correct
23 Correct 176 ms 285032 KB Output is correct
24 Correct 493 ms 285032 KB Output is correct
25 Correct 149 ms 285416 KB Output is correct
26 Correct 346 ms 290376 KB Output is correct
27 Correct 296 ms 290376 KB Output is correct