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Submission #501011

# Submission time Handle Problem Language Result Execution time Memory
501011 2022-01-02T07:08:37 Z InternetPerson10 Dynamic Diameter (CEOI19_diameter) C++17
24 / 100
 5000 ms 15648 KB 
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

vector<vector<pair<int, ll>>> adj;
vector<pair<int, int>> pa;
vector<pair<int, ll>> dist;

void init(int n, int q, ll l, vector<int> u, vector<int> v, vector<ll> w) {
    pa.resize(n-1);
    adj.resize(n);
    for(int i = 0; i < n-1; i++) {
        u[i]--; v[i]--;
        pa[i] = {u[i], v[i]};
        adj[u[i]].push_back({v[i], w[i]});
        adj[v[i]].push_back({u[i], w[i]});
    }
    for(int i = 0; i < n; i++) sort(adj[i].begin(), adj[i].end());
    dist.resize(n);
}

void dfs(int n, ll dis = 0, int par = -1) {
    dist[n] = {dis, n};
    for(auto ch : adj[n]) {
        if(ch.first == par) continue;
        dfs(ch.first, dis + ch.second, n);
    }
}

ll get_diameter(int d, ll e) {
    int x, y;
    tie(x, y) = pa[d];
    int l = 0, r = adj[x].size();
    while(l != r-1) {
        int mid = (l+r)/2;
        if(adj[x][mid].first <= y) l = mid;
        else r = mid; 
    }
    adj[x][l].second = e;
    l = 0; r = adj[y].size();
    while(l != r-1) {
        int mid = (l+r)/2;
        if(adj[y][mid].first <= x) l = mid;
        else r = mid; 
    }
    adj[y][l].second = e;
    dfs(0);
    sort(dist.rbegin(), dist.rend());
    dfs(dist[0].second);
    sort(dist.rbegin(), dist.rend());
    return dist[0].first;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, q;
    ll l;
    cin >> n >> q >> l;
    vector<int> u(n-1), v(n-1);
    vector<ll> w(n-1);
    for(int i = 0; i < n-1; i++) {
        cin >> u[i] >> v[i] >> w[i];
    }
    init(n, q, l, u, v, w);
    ll last = 0;
    for(int i = 0; i < q; i++) {
        ll d, e;
        cin >> d >> e;
        d += last;
        d %= n-1;
        e += last;
        e %= l;
        last = get_diameter(d, e);
        cout << last << '\n';
    }
}

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 312 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 1 ms 312 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct

Subtask #2
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 312 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 1 ms 312 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 590 ms 500 KB Output is correct
20 Correct 603 ms 452 KB Output is correct
21 Correct 607 ms 512 KB Output is correct
22 Correct 562 ms 820 KB Output is correct
23 Correct 4005 ms 1100 KB Output is correct
24 Correct 4141 ms 1224 KB Output is correct
25 Correct 4129 ms 1236 KB Output is correct
26 Correct 4128 ms 1420 KB Output is correct

Subtask #3
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 312 KB Output is correct
3 Correct 3 ms 312 KB Output is correct
4 Correct 25 ms 484 KB Output is correct
5 Correct 117 ms 1368 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 2 ms 332 KB Output is correct
8 Correct 10 ms 384 KB Output is correct
9 Correct 104 ms 384 KB Output is correct
10 Correct 1129 ms 672 KB Output is correct
11 Execution timed out 5050 ms 1800 KB Time limit exceeded
12 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 103 ms 460 KB Output is correct
2 Correct 1014 ms 584 KB Output is correct
3 Execution timed out 5035 ms 1108 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #5
0 / 24.0

# Verdict Execution time Memory Grader output
1 Execution timed out 5074 ms 15648 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 312 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 1 ms 312 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 590 ms 500 KB Output is correct
20 Correct 603 ms 452 KB Output is correct
21 Correct 607 ms 512 KB Output is correct
22 Correct 562 ms 820 KB Output is correct
23 Correct 4005 ms 1100 KB Output is correct
24 Correct 4141 ms 1224 KB Output is correct
25 Correct 4129 ms 1236 KB Output is correct
26 Correct 4128 ms 1420 KB Output is correct
27 Correct 1 ms 204 KB Output is correct
28 Correct 1 ms 312 KB Output is correct
29 Correct 3 ms 312 KB Output is correct
30 Correct 25 ms 484 KB Output is correct
31 Correct 117 ms 1368 KB Output is correct
32 Correct 0 ms 204 KB Output is correct
33 Correct 2 ms 332 KB Output is correct
34 Correct 10 ms 384 KB Output is correct
35 Correct 104 ms 384 KB Output is correct
36 Correct 1129 ms 672 KB Output is correct
37 Execution timed out 5050 ms 1800 KB Time limit exceeded
38 Halted 0 ms 0 KB -