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답안 #536138

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
536138 2022-03-12T12:40:23 Z Alex_tz307 Parkovi (COCI22_parkovi) C++17
110 / 110
 1143 ms 31360 KB 
#include <bits/stdc++.h>

using namespace std;

const int kN = 2e5;
const int64_t INF = 1e18L;
vector<pair<int, int>> g[1 + kN];
int N, depth[1 + kN], sol[kN];
bitset<1 + kN> mark, covered;

void maxSelf(int64_t &x, int64_t y) {
  if (x < y) {
    x = y;
  }
}

void minSelf(int64_t &x, int64_t y) {
  if (y < x) {
    x = y;
  }
}

int64_t dfs(int u, int par, int64_t radius) {
  if ((int)g[u].size() == 1 && par) {
    return 0;
  }
  int64_t mx = -INF, mn = INF;
  for (auto it : g[u]) {
    int v, w;
    tie(v, w) = it;
    if (v != par) {
      int64_t ret = dfs(v, u, radius);
      if (ret == 0 && covered[v]) { // v este acoperit si nimic din subarborele sau nu ma mai poate ajuta / incurca mai mult decat u
        maxSelf(mx, 0LL);
        minSelf(mn, 0LL);
        continue;
      }
      if (ret < 0 && ret + w <= 0) { // u este acoperit
        covered[u] = true;
      }
      if (ret < 0 && ret + w > 0) { // v sigur e acoperit si incepand de la u nu se mai acopera nimic nou, deci "resetez"
        ret = 0;
      } else { // creste distanta fata de ultimul nod marcat si mai mult
        ret += w;
      }
      if (ret > radius) { // trebuie sa il marchez pe v acum ca sa acopere alte noduri nemarcate, pentru ca deja u nu poate ajuta
        sol[N++] = v;
        mark[v] = true;
        covered[v] = true;
        ret = min(-radius + w, (int64_t)0); // aproape analog cu cazurile anterioare
        if (w <= radius) {
          covered[u] = true;
        }
      }
      maxSelf(mx, ret);
      minSelf(mn, ret);
    }
  }
  if (mx <= -mn) { // nodul de unde trebuie sa incep sa marchez din cauza lui mx(ca s-ar termina) va fi ori acoperit ori voi mai putea amana o eventuala marcare a sa datorita lui mn
    return mn;
  }
  return mx;
}

bool check(int64_t m, int k) {
  N = 0;
  mark.reset();
  covered.reset();
  if (dfs(1, 0, m) > 0) {
    sol[N++] = 1;
    mark[1] = true;
  } else if (!covered[1]) {
    sol[N++] = 1;
    mark[1] = true;
  }
  return N <= k;
}

void testCase() {
  int n, k;
  cin >> n >> k;
  for (int i = 1; i < n; ++i) {
    int u, v, w;
    cin >> u >> v >> w;
    g[u].emplace_back(v, w);
    g[v].emplace_back(u, w);
  }
  int64_t ans = 0, step = (1LL << 50);
  while (step) {
    if (!check(ans | step, k)) {
      ans |= step;
    }
    step /= 2;
  }
  ans += 1;
  check(ans, k);
  for (int v = 1; v <= n && N < k; ++v) {
    if (!mark[v]) {
      sol[N++] = v;
    }
  }
  cout << ans << '\n';
  for (int i = 0; i < k; ++i) {
    cout << sol[i] << ' ';
  }
  cout << '\n';
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  int tests = 1;
  for (int tc = 1; tc <= tests; ++tc) {
    testCase();
  }
  return 0;
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4988 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 4 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 3 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 370 ms 28528 KB Output is correct
2 Correct 386 ms 29164 KB Output is correct
3 Correct 229 ms 13168 KB Output is correct
4 Correct 997 ms 12048 KB Output is correct
5 Correct 968 ms 11832 KB Output is correct
6 Correct 898 ms 11840 KB Output is correct
7 Correct 859 ms 11900 KB Output is correct
8 Correct 961 ms 12264 KB Output is correct
9 Correct 904 ms 12072 KB Output is correct
10 Correct 951 ms 12240 KB Output is correct
11 Correct 679 ms 13456 KB Output is correct
12 Correct 591 ms 13796 KB Output is correct
13 Correct 720 ms 14596 KB Output is correct
14 Correct 574 ms 13644 KB Output is correct
15 Correct 622 ms 13144 KB Output is correct
16 Correct 608 ms 13804 KB Output is correct
17 Correct 622 ms 13132 KB Output is correct

Subtask #3
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 363 ms 29600 KB Output is correct
2 Correct 353 ms 28912 KB Output is correct
3 Correct 393 ms 27696 KB Output is correct
4 Correct 389 ms 27700 KB Output is correct
5 Correct 366 ms 30340 KB Output is correct
6 Correct 426 ms 29656 KB Output is correct
7 Correct 427 ms 30720 KB Output is correct
8 Correct 377 ms 29748 KB Output is correct
9 Correct 355 ms 29484 KB Output is correct
10 Correct 418 ms 29136 KB Output is correct
11 Correct 357 ms 28284 KB Output is correct
12 Correct 402 ms 31288 KB Output is correct
13 Correct 434 ms 31360 KB Output is correct
14 Correct 431 ms 30200 KB Output is correct
15 Correct 338 ms 29028 KB Output is correct
16 Correct 388 ms 28076 KB Output is correct
17 Correct 370 ms 27940 KB Output is correct
18 Correct 409 ms 29212 KB Output is correct
19 Correct 356 ms 29644 KB Output is correct
20 Correct 466 ms 30096 KB Output is correct
21 Correct 372 ms 29388 KB Output is correct

Subtask #4
60.0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4988 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 4 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 3 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 370 ms 28528 KB Output is correct
16 Correct 386 ms 29164 KB Output is correct
17 Correct 229 ms 13168 KB Output is correct
18 Correct 997 ms 12048 KB Output is correct
19 Correct 968 ms 11832 KB Output is correct
20 Correct 898 ms 11840 KB Output is correct
21 Correct 859 ms 11900 KB Output is correct
22 Correct 961 ms 12264 KB Output is correct
23 Correct 904 ms 12072 KB Output is correct
24 Correct 951 ms 12240 KB Output is correct
25 Correct 679 ms 13456 KB Output is correct
26 Correct 591 ms 13796 KB Output is correct
27 Correct 720 ms 14596 KB Output is correct
28 Correct 574 ms 13644 KB Output is correct
29 Correct 622 ms 13144 KB Output is correct
30 Correct 608 ms 13804 KB Output is correct
31 Correct 622 ms 13132 KB Output is correct
32 Correct 363 ms 29600 KB Output is correct
33 Correct 353 ms 28912 KB Output is correct
34 Correct 393 ms 27696 KB Output is correct
35 Correct 389 ms 27700 KB Output is correct
36 Correct 366 ms 30340 KB Output is correct
37 Correct 426 ms 29656 KB Output is correct
38 Correct 427 ms 30720 KB Output is correct
39 Correct 377 ms 29748 KB Output is correct
40 Correct 355 ms 29484 KB Output is correct
41 Correct 418 ms 29136 KB Output is correct
42 Correct 357 ms 28284 KB Output is correct
43 Correct 402 ms 31288 KB Output is correct
44 Correct 434 ms 31360 KB Output is correct
45 Correct 431 ms 30200 KB Output is correct
46 Correct 338 ms 29028 KB Output is correct
47 Correct 388 ms 28076 KB Output is correct
48 Correct 370 ms 27940 KB Output is correct
49 Correct 409 ms 29212 KB Output is correct
50 Correct 356 ms 29644 KB Output is correct
51 Correct 466 ms 30096 KB Output is correct
52 Correct 372 ms 29388 KB Output is correct
53 Correct 975 ms 11992 KB Output is correct
54 Correct 1135 ms 12208 KB Output is correct
55 Correct 1076 ms 12508 KB Output is correct
56 Correct 1024 ms 12396 KB Output is correct
57 Correct 1022 ms 13052 KB Output is correct
58 Correct 1032 ms 12052 KB Output is correct
59 Correct 1143 ms 14296 KB Output is correct
60 Correct 1016 ms 12548 KB Output is correct
61 Correct 866 ms 11824 KB Output is correct
62 Correct 932 ms 12744 KB Output is correct
63 Correct 990 ms 12576 KB Output is correct
64 Correct 942 ms 13996 KB Output is correct
65 Correct 959 ms 12288 KB Output is correct
66 Correct 980 ms 12944 KB Output is correct
67 Correct 906 ms 11928 KB Output is correct
68 Correct 1101 ms 14292 KB Output is correct
69 Correct 444 ms 29108 KB Output is correct
70 Correct 331 ms 27852 KB Output is correct
71 Correct 482 ms 30836 KB Output is correct
72 Correct 162 ms 12600 KB Output is correct
73 Correct 183 ms 12844 KB Output is correct
74 Correct 213 ms 13884 KB Output is correct
75 Correct 624 ms 14056 KB Output is correct
76 Correct 745 ms 14288 KB Output is correct
77 Correct 693 ms 13892 KB Output is correct
78 Correct 683 ms 14320 KB Output is correct