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Submission #525983

# Submission time Handle Problem Language Result Execution time Memory
525983 2022-02-13T11:59:11 Z model_code Parkovi (COCI22_parkovi) C++17
110 / 110
 1318 ms 32316 KB 
#include <bits/stdc++.h>

#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define REP(i, n) FOR(i, 0, n)
#define ll long long
#define X first
#define Y second

using namespace std;

const int MAXN = 201000;

vector <pair <int, int> > ve[MAXN];
ll mid;
int uk;
bool flag[MAXN];
int marked[MAXN];

ll dfs(int x, int par) {
    if (ve[x].size() == 1 && x != 0) return 0;

    ll mi = (1LL << 60), ma = -(1LL << 60);
    for (auto tr : ve[x]) {
        int y = tr.X;
        ll d = tr.Y;
        if (y == par) continue;

        ll a = dfs(y, x);
        if (a == 0 && flag[y] == 1) {
            mi = min(mi, 0LL);
            ma = max(ma, 0LL);
            continue;
        }

        if (a < 0 && a + d <= 0) flag[x] = 1;

        if (a < 0 && a + d > 0) a = 0;
        else a += d;

        if (a > mid) {
            uk++;
            marked[y] = 1;
            //cout << y << " ";
            a = min(-mid + d, 0LL);
            if (-mid + d <= 0) flag[x] = 1;
            flag[y] = 1;
            //cout << y + 1 << endl;
        }

        //cout << x + 1 << " " << y + 1 << " " << a << endl;

        ma = max(ma, a);
        mi = min(mi, a);
    }
    //cout << x + 1 << ": " << mi << " " << ma << endl;
    if (-mi >= ma/* && mi != 0*/) {
        //flag[x] = 1;
        return mi;
    }
    return ma;
}

int main() {
    ios_base::sync_with_stdio(false);

    int n, k;
    cin >> n >> k;
    REP(i, n - 1) {
        int a, b, c;
        cin >> a >> b >> c;
        a--, b--;
        ve[a].push_back({b, c});
        ve[b].push_back({a, c});
    }

    ll lo = 0, hi = (1LL << 60);
    while (lo < hi) {
        mid = (lo + hi) / 2;
        uk = 0;
        memset(flag, 0, sizeof flag);
        memset(marked, 0, sizeof marked);
        if (dfs(0, 0) > 0) marked[0] = 1, uk++;
        else if (flag[0] == 0) marked[0] = 1, uk++;

        //cout << endl << uk << endl;
        //cout << mid << " " << uk << endl;

        if (uk <= k) hi = mid;
        else         lo = mid + 1;
    }

    mid = lo;
    uk = 0;
    memset(flag, 0, sizeof flag);
    memset(marked, 0, sizeof marked);
    if (dfs(0, 0) > 0) marked[0] = 1, uk++;
    else if (flag[0] == 0) marked[0] = 1, uk++;

    cout << lo << "\n";
    vector <int> out;
    REP(i, n) if (marked[i] == 1) out.push_back(i + 1);
    REP(i, n) if (out.size() < k && marked[i] == 0) out.push_back(i + 1);
    for (int x : out) cout << x << " "; cout << "\n";

    return 0;
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:102:30: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  102 |     REP(i, n) if (out.size() < k && marked[i] == 0) out.push_back(i + 1);
      |                   ~~~~~~~~~~~^~~
Main.cpp:103:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  103 |     for (int x : out) cout << x << " "; cout << "\n";
      |     ^~~
Main.cpp:103:41: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  103 |     for (int x : out) cout << x << " "; cout << "\n";
      |                                         ^~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 5964 KB Output is correct
2 Correct 5 ms 5964 KB Output is correct
3 Correct 7 ms 6092 KB Output is correct
4 Correct 5 ms 5964 KB Output is correct
5 Correct 5 ms 5964 KB Output is correct
6 Correct 5 ms 5964 KB Output is correct
7 Correct 6 ms 5964 KB Output is correct
8 Correct 5 ms 5984 KB Output is correct
9 Correct 4 ms 5964 KB Output is correct
10 Correct 4 ms 5964 KB Output is correct
11 Correct 5 ms 6012 KB Output is correct
12 Correct 6 ms 5964 KB Output is correct
13 Correct 4 ms 5964 KB Output is correct
14 Correct 6 ms 6012 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 459 ms 29476 KB Output is correct
2 Correct 534 ms 30116 KB Output is correct
3 Correct 284 ms 13676 KB Output is correct
4 Correct 1002 ms 13000 KB Output is correct
5 Correct 1080 ms 12776 KB Output is correct
6 Correct 1115 ms 12780 KB Output is correct
7 Correct 1305 ms 12832 KB Output is correct
8 Correct 1318 ms 13208 KB Output is correct
9 Correct 1052 ms 13012 KB Output is correct
10 Correct 1031 ms 13252 KB Output is correct
11 Correct 736 ms 14400 KB Output is correct
12 Correct 708 ms 14716 KB Output is correct
13 Correct 765 ms 15540 KB Output is correct
14 Correct 670 ms 14568 KB Output is correct
15 Correct 677 ms 14092 KB Output is correct
16 Correct 706 ms 14628 KB Output is correct
17 Correct 668 ms 14020 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 455 ms 30552 KB Output is correct
2 Correct 417 ms 29976 KB Output is correct
3 Correct 390 ms 28648 KB Output is correct
4 Correct 377 ms 28588 KB Output is correct
5 Correct 412 ms 31568 KB Output is correct
6 Correct 423 ms 30752 KB Output is correct
7 Correct 465 ms 31740 KB Output is correct
8 Correct 424 ms 30700 KB Output is correct
9 Correct 417 ms 30484 KB Output is correct
10 Correct 413 ms 29956 KB Output is correct
11 Correct 377 ms 29104 KB Output is correct
12 Correct 454 ms 32316 KB Output is correct
13 Correct 439 ms 32184 KB Output is correct
14 Correct 439 ms 31360 KB Output is correct
15 Correct 388 ms 29972 KB Output is correct
16 Correct 406 ms 29056 KB Output is correct
17 Correct 369 ms 28880 KB Output is correct
18 Correct 415 ms 30148 KB Output is correct
19 Correct 404 ms 30784 KB Output is correct
20 Correct 398 ms 31156 KB Output is correct
21 Correct 407 ms 30508 KB Output is correct

Subtask #4
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 5964 KB Output is correct
2 Correct 5 ms 5964 KB Output is correct
3 Correct 7 ms 6092 KB Output is correct
4 Correct 5 ms 5964 KB Output is correct
5 Correct 5 ms 5964 KB Output is correct
6 Correct 5 ms 5964 KB Output is correct
7 Correct 6 ms 5964 KB Output is correct
8 Correct 5 ms 5984 KB Output is correct
9 Correct 4 ms 5964 KB Output is correct
10 Correct 4 ms 5964 KB Output is correct
11 Correct 5 ms 6012 KB Output is correct
12 Correct 6 ms 5964 KB Output is correct
13 Correct 4 ms 5964 KB Output is correct
14 Correct 6 ms 6012 KB Output is correct
15 Correct 459 ms 29476 KB Output is correct
16 Correct 534 ms 30116 KB Output is correct
17 Correct 284 ms 13676 KB Output is correct
18 Correct 1002 ms 13000 KB Output is correct
19 Correct 1080 ms 12776 KB Output is correct
20 Correct 1115 ms 12780 KB Output is correct
21 Correct 1305 ms 12832 KB Output is correct
22 Correct 1318 ms 13208 KB Output is correct
23 Correct 1052 ms 13012 KB Output is correct
24 Correct 1031 ms 13252 KB Output is correct
25 Correct 736 ms 14400 KB Output is correct
26 Correct 708 ms 14716 KB Output is correct
27 Correct 765 ms 15540 KB Output is correct
28 Correct 670 ms 14568 KB Output is correct
29 Correct 677 ms 14092 KB Output is correct
30 Correct 706 ms 14628 KB Output is correct
31 Correct 668 ms 14020 KB Output is correct
32 Correct 455 ms 30552 KB Output is correct
33 Correct 417 ms 29976 KB Output is correct
34 Correct 390 ms 28648 KB Output is correct
35 Correct 377 ms 28588 KB Output is correct
36 Correct 412 ms 31568 KB Output is correct
37 Correct 423 ms 30752 KB Output is correct
38 Correct 465 ms 31740 KB Output is correct
39 Correct 424 ms 30700 KB Output is correct
40 Correct 417 ms 30484 KB Output is correct
41 Correct 413 ms 29956 KB Output is correct
42 Correct 377 ms 29104 KB Output is correct
43 Correct 454 ms 32316 KB Output is correct
44 Correct 439 ms 32184 KB Output is correct
45 Correct 439 ms 31360 KB Output is correct
46 Correct 388 ms 29972 KB Output is correct
47 Correct 406 ms 29056 KB Output is correct
48 Correct 369 ms 28880 KB Output is correct
49 Correct 415 ms 30148 KB Output is correct
50 Correct 404 ms 30784 KB Output is correct
51 Correct 398 ms 31156 KB Output is correct
52 Correct 407 ms 30508 KB Output is correct
53 Correct 1178 ms 12940 KB Output is correct
54 Correct 1000 ms 13168 KB Output is correct
55 Correct 1052 ms 13508 KB Output is correct
56 Correct 988 ms 13380 KB Output is correct
57 Correct 1095 ms 14096 KB Output is correct
58 Correct 984 ms 13008 KB Output is correct
59 Correct 1081 ms 15320 KB Output is correct
60 Correct 1029 ms 13436 KB Output is correct
61 Correct 842 ms 12772 KB Output is correct
62 Correct 960 ms 13828 KB Output is correct
63 Correct 973 ms 13472 KB Output is correct
64 Correct 965 ms 14988 KB Output is correct
65 Correct 927 ms 13236 KB Output is correct
66 Correct 977 ms 13984 KB Output is correct
67 Correct 862 ms 12728 KB Output is correct
68 Correct 1069 ms 15480 KB Output is correct
69 Correct 404 ms 30000 KB Output is correct
70 Correct 371 ms 28712 KB Output is correct
71 Correct 447 ms 31784 KB Output is correct
72 Correct 190 ms 13200 KB Output is correct
73 Correct 184 ms 13620 KB Output is correct
74 Correct 203 ms 15232 KB Output is correct
75 Correct 675 ms 14988 KB Output is correct
76 Correct 747 ms 15172 KB Output is correct
77 Correct 693 ms 14788 KB Output is correct
78 Correct 783 ms 15300 KB Output is correct