oj.uz

답안 #659882

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
659882 2022-11-19T15:55:36 Z 600Mihnea Magic Tree (CEOI19_magictree) C++17
0 / 100
 2000 ms 23284 KB 
bool home = 0;
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int N = (int) 1e5 + 7;
int n;
int m;
int k;
int p[N];
int type[N];
int w[N];
int sub[N];
int bg[N];
ll dp[N];
int low[N];
int high[N];
int ord[N];
int top;
vector<int> g[N];

void bu(int a) {
  low[a] = ++top;
  ord[top] = a;
  sub[a] = 1;
  for (auto &b : g[a]) {
    bu(b);
    sub[a] += sub[b];
    if (sub[b] > sub[bg[a]]) {
      bg[a] = b;
    }
  }
  high[a] = top;
}


vector<pair<int, ll>> get_and_clr_dp(int v) {
  vector<pair<int, ll>> sol;
  for (int j = low[v]; j <= high[v]; j++) {
    if (int i = type[ord[j]]) {
      sol.push_back({i, dp[i] - dp[i - 1]});
    }
  }
  for (int i = 1; i <= k; i++) {
    dp[i] = 0;
  }
  return sol;
}

ll dpaux[N];

void solve(int a) {
  if (g[a].empty()) {
    if (type[a]) {
      for (int j = type[a]; j <= k; j++) {
        dp[j] += w[a];
      }
    }
  } else {
    assert(bg[a] != -1);
    vector<vector<pair<int, ll>>> all;
    for (auto &b : g[a]) {
      if (b != bg[a]) {
        solve(b);
        all.push_back(get_and_clr_dp(b));
        continue;
      }
    }
    {
      int b = bg[a];
      solve(b);
      for (auto &v : all) {
        for (auto &g : v) {
          for (int j = g.first; j <= k; j++) {
            dp[j] += g.second;
          }
        }
      }
      if (type[a]) {
        dp[type[a]] += w[a];
        for (int j = type[a]; j <= k; j++) {
          dp[j] = max(dp[j], dp[j - 1]);
        }
      }
    }
  }
}

int main() {
  if (!home) {
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  } else {
    freopen("input.txt", "r", stdin);
  }


  cin >> n >> m >> k;
  if (0) {
    cout << "  : ";
    for (int i = 1; i <= k; i++) {
      cout << i << " ";
    }
    cout << "\n";
  }
  for (int i = 2; i <= n; i++) {
    cin >> p[i];
    g[p[i]].push_back(i);
  }
  for (int i = 1; i <= m; i++) {
    int v;
    cin >> v;
    cin >> type[v];
    cin >> w[v];
  }
  {
    map<int, int> mp;
    for (int i = 1; i <= n; i++) {
      if (type[i]) {
        mp[type[i]] = 0;
      }
    }
    int cr = 0;
    for (auto &it : mp) {
      it.second = ++cr;
    }
    for (int i = 1; i <= n; i++) {
      if (type[i]) {
        type[i] = mp[type[i]];
      }
    }
    k = min(k, m);
  }
  bu(1);
  solve(1);
  cout << dp[k] << "\n";
  return 0;
}
/**

dp[vertex][last_value] = ?



**/

Compilation message

magictree.cpp: In function 'int main()':
magictree.cpp:95:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   95 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Incorrect 2 ms 2696 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1220 ms 8468 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2900 KB Output is correct
2 Correct 3 ms 2900 KB Output is correct
3 Correct 2 ms 2900 KB Output is correct
4 Execution timed out 2083 ms 23284 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #4
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 69 ms 9156 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Incorrect 2 ms 2696 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 3668 KB Output is correct
2 Incorrect 40 ms 7424 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Incorrect 2 ms 2696 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #8
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Incorrect 2 ms 2696 KB Output isn't correct
3 Halted 0 ms 0 KB -