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답안 #1097651

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1097651 2024-10-07T20:09:16 Z SiddharthJoshi6263 경주 (Race) (IOI11_race) C++17
9 / 100
 279 ms 58104 KB 
#include <bits/stdc++.h>

using namespace std;

// #ifdef ONLINE_JUDGE
// #define debug(...)
// #else
// #include "debug.h"
// #endif

#define f first
#define s second
#define pb push_back
#define all(x) x.begin(), x.end()
#define sz(x) (long long)(x).size()
#define pii pair<long long, long long>

long long ANS = LLONG_MAX;

void dfs_sze(long long u, long long par, vector<vector<pii>> &adj, vector<long long> &sze, vector<long long> &len, vector<long long> &depth) {
    sze[u] = 1;
    for (auto v : adj[u]) {
        if (v.f != par) {
            len[v.f] = len[u] + v.s;
            depth[v.f] = depth[u] + 1;
            dfs_sze(v.f, u, adj, sze, len, depth);
            sze[u] += sze[v.f];
        }
    }
}

void small_to_large_merging(long long K, long long u, long long par, vector<long long> &sze, vector<long long> &len, vector<long long> &depth, vector<vector<pii>> &adj, vector<multiset<pii>> &sets) {
    long long big = -1, big_wt = 0;
    for (auto v : adj[u]) {
        if (v.f != par) {
            if (big == -1 || sze[big] < sze[v.f]) {
                big = v.f;
                big_wt = v.s;
            }
        }
    }
    if (big == -1) {
        return;
    }
    small_to_large_merging(K, big, u, sze, len, depth, adj, sets);
    vector<pii> smalls1, smalls2;
    for (auto x : adj[u]) {
        if (x.f != par && x.f != big) {
            small_to_large_merging(K, x.f, u, sze, len, depth, adj, sets);
            long long edge_wt = x.s;
            for (auto y : sets[x.f]) {
                smalls1.pb({y.f, y.s});
                long long act_len = y.f - len[x.f] + edge_wt + big_wt;
                long long act_dep = y.s - depth[x.f] + 2;
                long long find_len = K - act_len;
                if (find_len < 0)continue;
                if (find_len == 0) {
                    ANS = min(ANS, act_dep);
                    continue;
                }
                long long search = find_len + len[big];
                pii finds = {search, -1ll};
                auto vals = sets[big].lower_bound(finds);
                if (vals != sets[big].end()) {
                    if (vals->f == search) {
                        ANS = min(ANS, act_dep + vals->s - depth[big]);
                    }
                }
            }
            for (auto y : sets[x.f]) {
                smalls2.pb({y.f + edge_wt - big_wt, y.s});
                sets[big].insert({y.f + edge_wt - big_wt, y.s});
            }
        }
    }
    for (auto x : smalls2) {
        sets[big].erase(sets[big].find(x));
    }
    for (auto x : smalls1) {
        sets[big].insert(x);
    }
    sets[u].swap(sets[big]);
    sets[u].insert({len[u], depth[u]});
    pii finds = {K + len[u], -1ll};
    auto vals = sets[u].lower_bound(finds);
    if (vals != sets[u].end()) {
        if (vals->f == K + len[u]) {
            ANS = min(ANS, vals->s - depth[u]);
        }
    }
}

int best_path (int N, int k, int H[][2], int L[]) {
    long long n = N, K = k;
    vector<vector<pii>> adj(n);
    for (long long i = 0; i < n - 1; i++) {
        adj[H[i][0]].pb({H[i][1], L[i]});
        adj[H[i][1]].pb({H[i][0], L[i]});
    }
    vector<long long> sze(n, 0);
    vector<long long> len(n, 0);
    vector<long long> depth(n, 0);
    dfs_sze(0, -1, adj, sze, len, depth);
    vector<multiset<pii>> sets(n);
    for (long long i = 0; i < n; i++) {
        sets[i].insert({len[i], depth[i]});
    }
    small_to_large_merging(K, 0, -1, sze, len, depth, adj, sets);
    if (ANS == LLONG_MAX) {
        return -1;
    }
    return ANS;
}

// void solve() {
//     int n, K;
//     cin >> n >> K;
//     int H[n - 1][2];
//     int L[n - 1];
//     for (long long i = 0; i < n - 1; i++) {
//         cin >> H[i][0] >> H[i][1];
//     }
//     for (long long i = 0; i < n - 1; i++) {
//         cin >> L[i];
//     }
//     cout << best_path(n, K, H, L) << endl;
// }

// signed main() {
//     ios_base::sync_with_stdio(false);
//     cin.tie(NULL);
//     cout.tie(NULL);
//     long long zz = 1;
//     // cin >> zz;
//     for (long long i = 1; i <= zz; i++) {
//         // cout << "Case #" << i << ": ";
//         solve();
//     }
//     return 0;
// }

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 604 KB Output is correct
5 Correct 0 ms 604 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 360 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 1 ms 440 KB Output is correct

Subtask #2
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 604 KB Output is correct
5 Correct 0 ms 604 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 360 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 1 ms 440 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 2 ms 860 KB Output is correct
22 Correct 2 ms 860 KB Output is correct
23 Correct 1 ms 604 KB Output is correct
24 Correct 2 ms 616 KB Output is correct
25 Correct 1 ms 860 KB Output is correct
26 Correct 2 ms 860 KB Output is correct
27 Correct 2 ms 604 KB Output is correct
28 Correct 2 ms 604 KB Output is correct
29 Incorrect 2 ms 860 KB Output isn't correct
30 Halted 0 ms 0 KB -

Subtask #3
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 604 KB Output is correct
5 Correct 0 ms 604 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 360 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 1 ms 440 KB Output is correct
19 Correct 272 ms 57824 KB Output is correct
20 Correct 279 ms 56240 KB Output is correct
21 Incorrect 262 ms 58104 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #4
0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 604 KB Output is correct
5 Correct 0 ms 604 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 360 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 1 ms 440 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 2 ms 860 KB Output is correct
22 Correct 2 ms 860 KB Output is correct
23 Correct 1 ms 604 KB Output is correct
24 Correct 2 ms 616 KB Output is correct
25 Correct 1 ms 860 KB Output is correct
26 Correct 2 ms 860 KB Output is correct
27 Correct 2 ms 604 KB Output is correct
28 Correct 2 ms 604 KB Output is correct
29 Incorrect 2 ms 860 KB Output isn't correct
30 Halted 0 ms 0 KB -