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Submission #1059461

# Submission time Handle Problem Language Result Execution time Memory
1059461 2024-08-15T01:44:05 Z Flan312 Parkovi (COCI22_parkovi) C++17
110 / 110
 321 ms 35368 KB 
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define eb emplace_back
#define task "CONGVIEN"
#define fast ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define nx freopen (task".inp","r",stdin), freopen (task".out","w",stdout);
#define fi first
#define se second
#define pii pair <int, int>
#define tii tuple <int, int, int>
#define all(s) s.begin(), s.end()
using namespace std;

const ll oo = 1e18;
const int nmax = 2e5 + 2;
int n, k;
bool placed_park[nmax];
vector <pii> adj[nmax];
ll r = 0;

int cnt = 0;
ll dist[nmax], reach[nmax];
void dfs(int u, int par, ll mxDist)
{
    dist[u] = oo;
    reach[u] = 0;

    for (auto &[v, w] : adj[u])
    {
        if (v == par) continue;
        dfs(v, u, mxDist);

        if (reach[v] + min(1ll * w, dist[v]) <= mxDist) 
        {
            placed_park[v] = 0;
            if (reach[v] + dist[v] > mxDist)
                reach[u] = max(reach[u], reach[v] + w);
            dist[u] = min(dist[u], dist[v] + w);
        }
        else
        {
            placed_park[v] = 1;
            ++cnt;
            dist[u] = min(dist[u], 1ll * w);
        }
    }
}

bool check(ll mxDist)
{
    cnt = 0;
    dfs(1, -1, mxDist);
    if (reach[1] + dist[1] <= mxDist)
        placed_park[1] = 0;
    else
    {
        placed_park[1] = 1;
        ++cnt;
    }
    return cnt <= k;
}

int main()
{
    if (ifstream(task".inp")) nx
    fast

    cin >> n >> k;
    for (int u, v, w, i = 1; i < n; ++i)
    {
        cin >> u >> v >> w;
        adj[u].eb(v, w);
        adj[v].eb(u, w);
        r += w;
    }

    ll l = 0, ans = -1;
    while(l <= r)
    {
        ll mid = l + r >> 1;
        if (check(mid))
            ans = mid, r = mid - 1;
        else l = mid + 1;
    }

    cout << ans << '\n';
    check(ans);
    vector <int> res;
    for (int i = 1; i <= n; ++i)
        if (placed_park[i]) res.eb(i);
    for (int i = 1; i <= n; ++i)
        if (res.size() < k && !placed_park[i]) res.eb(i);
    for (auto &i : res)
        cout << i << ' ';
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:81:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   81 |         ll mid = l + r >> 1;
      |                  ~~^~~
Main.cpp:93:24: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   93 |         if (res.size() < k && !placed_park[i]) res.eb(i);
      |             ~~~~~~~~~~~^~~
Main.cpp:7:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 | #define nx freopen (task".inp","r",stdin), freopen (task".out","w",stdout);
      |            ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:66:31: note: in expansion of macro 'nx'
   66 |     if (ifstream(task".inp")) nx
      |                               ^~
Main.cpp:7:52: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 | #define nx freopen (task".inp","r",stdin), freopen (task".out","w",stdout);
      |                                            ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:66:31: note: in expansion of macro 'nx'
   66 |     if (ifstream(task".inp")) nx
      |                               ^~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8108 KB Output is correct
2 Correct 1 ms 8028 KB Output is correct
3 Correct 1 ms 8028 KB Output is correct
4 Correct 1 ms 8028 KB Output is correct
5 Correct 1 ms 8028 KB Output is correct
6 Correct 1 ms 8028 KB Output is correct
7 Correct 1 ms 8028 KB Output is correct
8 Correct 1 ms 8028 KB Output is correct
9 Correct 1 ms 8028 KB Output is correct
10 Correct 1 ms 8108 KB Output is correct
11 Correct 1 ms 8028 KB Output is correct
12 Correct 1 ms 8028 KB Output is correct
13 Correct 1 ms 8028 KB Output is correct
14 Correct 1 ms 8024 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 93 ms 31812 KB Output is correct
2 Correct 153 ms 33620 KB Output is correct
3 Correct 126 ms 20676 KB Output is correct
4 Correct 276 ms 19540 KB Output is correct
5 Correct 263 ms 19028 KB Output is correct
6 Correct 284 ms 19028 KB Output is correct
7 Correct 144 ms 18004 KB Output is correct
8 Correct 150 ms 18408 KB Output is correct
9 Correct 269 ms 18772 KB Output is correct
10 Correct 286 ms 19028 KB Output is correct
11 Correct 247 ms 20568 KB Output is correct
12 Correct 243 ms 20820 KB Output is correct
13 Correct 270 ms 21844 KB Output is correct
14 Correct 129 ms 19392 KB Output is correct
15 Correct 131 ms 18772 KB Output is correct
16 Correct 234 ms 20340 KB Output is correct
17 Correct 227 ms 19464 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 160 ms 34228 KB Output is correct
2 Correct 145 ms 33364 KB Output is correct
3 Correct 136 ms 32084 KB Output is correct
4 Correct 128 ms 32080 KB Output is correct
5 Correct 169 ms 34936 KB Output is correct
6 Correct 185 ms 34256 KB Output is correct
7 Correct 185 ms 35368 KB Output is correct
8 Correct 153 ms 33796 KB Output is correct
9 Correct 150 ms 33364 KB Output is correct
10 Correct 145 ms 32964 KB Output is correct
11 Correct 130 ms 32140 KB Output is correct
12 Correct 172 ms 35280 KB Output is correct
13 Correct 185 ms 35272 KB Output is correct
14 Correct 195 ms 34488 KB Output is correct
15 Correct 84 ms 32084 KB Output is correct
16 Correct 80 ms 31312 KB Output is correct
17 Correct 86 ms 31060 KB Output is correct
18 Correct 90 ms 32512 KB Output is correct
19 Correct 102 ms 33008 KB Output is correct
20 Correct 105 ms 33372 KB Output is correct
21 Correct 101 ms 32720 KB Output is correct

Subtask #4
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8108 KB Output is correct
2 Correct 1 ms 8028 KB Output is correct
3 Correct 1 ms 8028 KB Output is correct
4 Correct 1 ms 8028 KB Output is correct
5 Correct 1 ms 8028 KB Output is correct
6 Correct 1 ms 8028 KB Output is correct
7 Correct 1 ms 8028 KB Output is correct
8 Correct 1 ms 8028 KB Output is correct
9 Correct 1 ms 8028 KB Output is correct
10 Correct 1 ms 8108 KB Output is correct
11 Correct 1 ms 8028 KB Output is correct
12 Correct 1 ms 8028 KB Output is correct
13 Correct 1 ms 8028 KB Output is correct
14 Correct 1 ms 8024 KB Output is correct
15 Correct 93 ms 31812 KB Output is correct
16 Correct 153 ms 33620 KB Output is correct
17 Correct 126 ms 20676 KB Output is correct
18 Correct 276 ms 19540 KB Output is correct
19 Correct 263 ms 19028 KB Output is correct
20 Correct 284 ms 19028 KB Output is correct
21 Correct 144 ms 18004 KB Output is correct
22 Correct 150 ms 18408 KB Output is correct
23 Correct 269 ms 18772 KB Output is correct
24 Correct 286 ms 19028 KB Output is correct
25 Correct 247 ms 20568 KB Output is correct
26 Correct 243 ms 20820 KB Output is correct
27 Correct 270 ms 21844 KB Output is correct
28 Correct 129 ms 19392 KB Output is correct
29 Correct 131 ms 18772 KB Output is correct
30 Correct 234 ms 20340 KB Output is correct
31 Correct 227 ms 19464 KB Output is correct
32 Correct 160 ms 34228 KB Output is correct
33 Correct 145 ms 33364 KB Output is correct
34 Correct 136 ms 32084 KB Output is correct
35 Correct 128 ms 32080 KB Output is correct
36 Correct 169 ms 34936 KB Output is correct
37 Correct 185 ms 34256 KB Output is correct
38 Correct 185 ms 35368 KB Output is correct
39 Correct 153 ms 33796 KB Output is correct
40 Correct 150 ms 33364 KB Output is correct
41 Correct 145 ms 32964 KB Output is correct
42 Correct 130 ms 32140 KB Output is correct
43 Correct 172 ms 35280 KB Output is correct
44 Correct 185 ms 35272 KB Output is correct
45 Correct 195 ms 34488 KB Output is correct
46 Correct 84 ms 32084 KB Output is correct
47 Correct 80 ms 31312 KB Output is correct
48 Correct 86 ms 31060 KB Output is correct
49 Correct 90 ms 32512 KB Output is correct
50 Correct 102 ms 33008 KB Output is correct
51 Correct 105 ms 33372 KB Output is correct
52 Correct 101 ms 32720 KB Output is correct
53 Correct 285 ms 19524 KB Output is correct
54 Correct 289 ms 19728 KB Output is correct
55 Correct 296 ms 20512 KB Output is correct
56 Correct 295 ms 20132 KB Output is correct
57 Correct 304 ms 20680 KB Output is correct
58 Correct 269 ms 19540 KB Output is correct
59 Correct 293 ms 22184 KB Output is correct
60 Correct 160 ms 18772 KB Output is correct
61 Correct 152 ms 17736 KB Output is correct
62 Correct 145 ms 18892 KB Output is correct
63 Correct 161 ms 18808 KB Output is correct
64 Correct 159 ms 20248 KB Output is correct
65 Correct 287 ms 19284 KB Output is correct
66 Correct 290 ms 19916 KB Output is correct
67 Correct 268 ms 18588 KB Output is correct
68 Correct 321 ms 21448 KB Output is correct
69 Correct 145 ms 33620 KB Output is correct
70 Correct 129 ms 31840 KB Output is correct
71 Correct 203 ms 34768 KB Output is correct
72 Correct 108 ms 19912 KB Output is correct
73 Correct 68 ms 19152 KB Output is correct
74 Correct 77 ms 20764 KB Output is correct
75 Correct 243 ms 21076 KB Output is correct
76 Correct 148 ms 20304 KB Output is correct
77 Correct 246 ms 20472 KB Output is correct
78 Correct 142 ms 20180 KB Output is correct