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답안 #518612

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
518612 2022-01-24T09:46:04 Z Monarchuwu Dynamic Diameter (CEOI19_diameter) C++17
49 / 100
 1426 ms 17596 KB 
#include<iostream>
#include<algorithm>
#include<vector>
#include<set>
#define all(x) x.begin(), x.end()
using namespace std;
typedef long long ll;

typedef pair<int, ll> pil;
#define ff first
#define ss second

const int N = 1e5 + 9;
int n, q;
ll w, c;
vector<int> g[N];
struct Edge {
    int u, v;
    ll w;
    int operator()(int x) { return u ^ v ^ x; }
} e[N];

namespace subtask12 {
    vector<ll> a[N];
    void dfs(int u, int p) {
        a[u].assign(2, 0);
        for (int id : g[u]) if (p != id) {
            int v = e[id](u);
            dfs(v, id);
            a[u].push_back(a[v][0] + e[id].w);
        }
        sort(all(a[u]), greater<ll>());
    }
    ll gogo() {
        dfs(1, 0);
        ll ans(0);
        for (int i = 1; i <= n; ++i)
            ans = max(ans, a[i][0] + a[i][1]);
        return ans;
    }
    void solve() {
        int d;
        ll ee, last(0); while (q--) {
            cin >> d >> ee;
            d = (d + last) % (n - 1);
            ee = (ee + last) % w;

            e[d + 1].w = ee;
            last = gogo();
            cout << last << '\n';
        }
    }
}

namespace subtask3 {
    void solve() {
        multiset<int, greater<int>> s;
        for (int i = 1; i < n; ++i)
            s.insert(e[i].w);

        int d, ee, last(0); while (q--) {
            cin >> d >> ee;
            d = (d + last) % (n - 1);
            ee = (ee + last) % w;

            s.erase(s.find(e[d + 1].w));
            s.insert(e[d + 1].w = ee);
            last = *s.begin() + *next(s.begin());

            cout << last << '\n';
        }
    }
}

namespace subtask4 {
    bool check() {
        for (int i = 1; i < n; ++i)
            if (e[i].v / 2 != e[i].u) return false;
        return true;
    }

    struct Node {
        ll path, diam;
    } seg[1 << 18];
    ll wei[N];

    void build(int u) {
        if (u > n) return;
        if (u * 2 > n) seg[u].path = seg[u].diam = wei[u];
        else {
            int u1 = u << 1, u2 = u1 | 1;
            build(u1);
            build(u2);
            seg[u].path = max(seg[u1].path, seg[u2].path) + wei[u];
            seg[u].diam = max({ seg[u1].diam, seg[u2].diam, seg[u1].path + seg[u2].path });
        }
    }

    void upd(int u) {
        if (u * 2 > n) seg[u].path = seg[u].diam = wei[u];
        else {
            int u1 = u << 1, u2 = u1 | 1;
            seg[u].path = max(seg[u1].path, seg[u2].path) + wei[u];
        }

        for (u >>= 1; u; u >>= 1) {
            int u1 = u << 1, u2 = u1 | 1;
            seg[u].path = max(seg[u1].path, seg[u2].path) + wei[u];
            seg[u].diam = max({ seg[u1].diam, seg[u2].diam, seg[u1].path + seg[u2].path });
        }
    }

    void solve() {
        wei[1] = 0;
        for (int i = 1; i < n; ++i) wei[e[i].v] = e[i].w;
        build(1);

        int d;
        ll ee, last(0); while (q--) {
            cin >> d >> ee;
            d = (d + last) % (n - 1);
            ee = (ee + last) % w;

            wei[e[d + 1].v] = ee;
            upd(e[d + 1].v);
            last = seg[1].diam;

            cout << last << '\n';
        }
    }
}

int main() {
    cin.tie(NULL)->sync_with_stdio(false);
    cin >> n >> q >> w;
    for (int i = 1, u, v; i < n; ++i) {
        cin >> e[i].u >> e[i].v >> e[i].w;
        if (e[i].u > e[i].v) swap(e[i].u, e[i].v);
        g[e[i].u].push_back(i);
        g[e[i].v].push_back(i);
    }

    if (n <= 5000 && q <= 5000) subtask12::solve();
    else if (g[1].size() == n - 1) subtask3::solve();
    else if (subtask4::check()) subtask4::solve();
}
/**  /\_/\
 *  (= ._.)
 *  / >0  \>1
**/

Compilation message

diameter.cpp: In function 'int main()':
diameter.cpp:136:21: warning: unused variable 'u' [-Wunused-variable]
  136 |     for (int i = 1, u, v; i < n; ++i) {
      |                     ^
diameter.cpp:136:24: warning: unused variable 'v' [-Wunused-variable]
  136 |     for (int i = 1, u, v; i < n; ++i) {
      |                        ^
diameter.cpp:144:26: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  144 |     else if (g[1].size() == n - 1) subtask3::solve();
      |              ~~~~~~~~~~~~^~~~~~~~

Subtask #1
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 5008 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 3 ms 4968 KB Output is correct
6 Correct 4 ms 4940 KB Output is correct
7 Correct 3 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 2 ms 4940 KB Output is correct
11 Correct 4 ms 5028 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 4 ms 5020 KB Output is correct
16 Correct 3 ms 4940 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct

Subtask #2
13.0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 5008 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 3 ms 4968 KB Output is correct
6 Correct 4 ms 4940 KB Output is correct
7 Correct 3 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 2 ms 4940 KB Output is correct
11 Correct 4 ms 5028 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 4 ms 5020 KB Output is correct
16 Correct 3 ms 4940 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 196 ms 5116 KB Output is correct
20 Correct 213 ms 5116 KB Output is correct
21 Correct 194 ms 5132 KB Output is correct
22 Correct 195 ms 5208 KB Output is correct
23 Correct 1382 ms 5500 KB Output is correct
24 Correct 1383 ms 5604 KB Output is correct
25 Correct 1420 ms 5656 KB Output is correct
26 Correct 1426 ms 6020 KB Output is correct

Subtask #3
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 5 ms 4940 KB Output is correct
4 Correct 8 ms 5068 KB Output is correct
5 Correct 34 ms 5444 KB Output is correct
6 Correct 3 ms 4940 KB Output is correct
7 Correct 3 ms 4940 KB Output is correct
8 Correct 10 ms 5072 KB Output is correct
9 Correct 58 ms 5072 KB Output is correct
10 Correct 11 ms 5068 KB Output is correct
11 Correct 37 ms 5472 KB Output is correct
12 Correct 4 ms 5452 KB Output is correct
13 Correct 5 ms 5520 KB Output is correct
14 Correct 7 ms 5452 KB Output is correct
15 Correct 13 ms 5536 KB Output is correct
16 Correct 54 ms 5948 KB Output is correct
17 Correct 56 ms 14736 KB Output is correct
18 Correct 53 ms 14760 KB Output is correct
19 Correct 58 ms 14796 KB Output is correct
20 Correct 78 ms 16284 KB Output is correct
21 Correct 141 ms 17596 KB Output is correct

Subtask #4
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 31 ms 5068 KB Output is correct
2 Correct 6 ms 5068 KB Output is correct
3 Correct 17 ms 5324 KB Output is correct
4 Correct 29 ms 5580 KB Output is correct
5 Correct 6 ms 5708 KB Output is correct
6 Correct 12 ms 5756 KB Output is correct
7 Correct 19 ms 5964 KB Output is correct
8 Correct 33 ms 6228 KB Output is correct
9 Correct 19 ms 8556 KB Output is correct
10 Correct 22 ms 8520 KB Output is correct
11 Correct 34 ms 8756 KB Output is correct
12 Correct 48 ms 9076 KB Output is correct
13 Correct 45 ms 11972 KB Output is correct
14 Correct 42 ms 12088 KB Output is correct
15 Correct 52 ms 12260 KB Output is correct
16 Correct 66 ms 12600 KB Output is correct
17 Correct 64 ms 12612 KB Output is correct

Subtask #5
0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 42 ms 9744 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 5008 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 3 ms 4968 KB Output is correct
6 Correct 4 ms 4940 KB Output is correct
7 Correct 3 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 2 ms 4940 KB Output is correct
11 Correct 4 ms 5028 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 4 ms 5020 KB Output is correct
16 Correct 3 ms 4940 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 196 ms 5116 KB Output is correct
20 Correct 213 ms 5116 KB Output is correct
21 Correct 194 ms 5132 KB Output is correct
22 Correct 195 ms 5208 KB Output is correct
23 Correct 1382 ms 5500 KB Output is correct
24 Correct 1383 ms 5604 KB Output is correct
25 Correct 1420 ms 5656 KB Output is correct
26 Correct 1426 ms 6020 KB Output is correct
27 Correct 3 ms 4940 KB Output is correct
28 Correct 3 ms 4940 KB Output is correct
29 Correct 5 ms 4940 KB Output is correct
30 Correct 8 ms 5068 KB Output is correct
31 Correct 34 ms 5444 KB Output is correct
32 Correct 3 ms 4940 KB Output is correct
33 Correct 3 ms 4940 KB Output is correct
34 Correct 10 ms 5072 KB Output is correct
35 Correct 58 ms 5072 KB Output is correct
36 Correct 11 ms 5068 KB Output is correct
37 Correct 37 ms 5472 KB Output is correct
38 Correct 4 ms 5452 KB Output is correct
39 Correct 5 ms 5520 KB Output is correct
40 Correct 7 ms 5452 KB Output is correct
41 Correct 13 ms 5536 KB Output is correct
42 Correct 54 ms 5948 KB Output is correct
43 Correct 56 ms 14736 KB Output is correct
44 Correct 53 ms 14760 KB Output is correct
45 Correct 58 ms 14796 KB Output is correct
46 Correct 78 ms 16284 KB Output is correct
47 Correct 141 ms 17596 KB Output is correct
48 Correct 31 ms 5068 KB Output is correct
49 Correct 6 ms 5068 KB Output is correct
50 Correct 17 ms 5324 KB Output is correct
51 Correct 29 ms 5580 KB Output is correct
52 Correct 6 ms 5708 KB Output is correct
53 Correct 12 ms 5756 KB Output is correct
54 Correct 19 ms 5964 KB Output is correct
55 Correct 33 ms 6228 KB Output is correct
56 Correct 19 ms 8556 KB Output is correct
57 Correct 22 ms 8520 KB Output is correct
58 Correct 34 ms 8756 KB Output is correct
59 Correct 48 ms 9076 KB Output is correct
60 Correct 45 ms 11972 KB Output is correct
61 Correct 42 ms 12088 KB Output is correct
62 Correct 52 ms 12260 KB Output is correct
63 Correct 66 ms 12600 KB Output is correct
64 Correct 64 ms 12612 KB Output is correct
65 Incorrect 42 ms 9744 KB Output isn't correct
66 Halted 0 ms 0 KB -