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답안 #681310

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
681310 2023-01-12T18:12:54 Z badont 경주 (Race) (IOI11_race) C++17
100 / 100
 1295 ms 62136 KB 
#include "race.h"
#include <bits/stdc++.h>

using LL = long long;
const LL INF = 1e9;
using namespace std;
using pii = pair<LL, LL>;

#define pb push_back

#ifdef LOCAL
#define debug(...) cout << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
#else
#define debug(...) "zzz"
#endif


int best_path(int N, int K, int H[][2], int L[]) {
    
    LL ans = INF;
    vector e(N, vector<pii>());
    for (LL i = 0; i < N - 1; i++) {
        LL x = H[i][0], y = H[i][1], d = L[i];
        e[x].pb({y, d});
        e[y].pb({x, d});
    }

    //debug(e);

    vector<bool> v(N);
    vector<LL> sub(N);
    auto cen_decomp = [&](auto cen_decomp, LL g, LL SZ) -> void {
        auto dfs_sub = [&](auto dfs_sub, LL g, LL p) -> void {
            sub[g] = 1;
            for (auto [u, d] : e[g]) if (u != p && !v[u]) {
                dfs_sub(dfs_sub, u, g);
                sub[g] += sub[u];
            }
        };

        auto find_cen = [&](auto find_cen, LL g, LL p) -> LL {
            for (auto [u, d] : e[g]) if (u != p && !v[u]) {
                if (sub[u] * 2 >= SZ) 
                    return find_cen(find_cen, u, g);
            }
            return g;
        };

        dfs_sub(dfs_sub, g, -1);
        g = find_cen(find_cen, g, -1);
        dfs_sub(dfs_sub, g, -1);

        //debug(g);

        v[g] = 1;
        map<LL, LL> dp;
        auto fill_dp = [&](auto fill_dp, LL g, LL p, LL L, LL d) -> void {
            if (!dp.count(L)) {
                dp[L] = d;
            } else {
                dp[L] = min(dp[L], (LL)d); 
            }

            for (auto [u, nl] : e[g]) if (!v[u] && u != p) {
                fill_dp(fill_dp, u, g, L + nl, d + 1);
            }
        };

        auto compare_dp = [&](auto compare_dp, LL g, LL p, LL L, LL d) -> void {
            if (dp.count(K - L)) {
                ans = min(ans, d + dp[K - L]);
            }   

            for (auto [u, nl] : e[g]) if (!v[u] && u != p) {
                compare_dp(compare_dp, u, g, L + nl, d + 1);
            }
        };

        dp[0] = 0;
        for (auto [u, d] : e[g]) if (!v[u]) {
            compare_dp(compare_dp, u, g, d, 1);
            fill_dp(fill_dp, u, g, d, 1);
        }

        for (auto [u, d] : e[g]) if (!v[u]) {
            cen_decomp(cen_decomp, u, sub[u]);
        }
    };

    cen_decomp(cen_decomp, 0, N);

    return (ans >= INF ? -1 : ans);
}

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 304 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 312 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 308 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 312 KB Output is correct
14 Correct 1 ms 304 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 308 KB Output is correct
18 Correct 1 ms 308 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 304 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 312 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 308 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 312 KB Output is correct
14 Correct 1 ms 304 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 308 KB Output is correct
18 Correct 1 ms 308 KB Output is correct
19 Correct 1 ms 284 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 2 ms 444 KB Output is correct
22 Correct 3 ms 468 KB Output is correct
23 Correct 3 ms 468 KB Output is correct
24 Correct 2 ms 468 KB Output is correct
25 Correct 2 ms 468 KB Output is correct
26 Correct 4 ms 468 KB Output is correct
27 Correct 2 ms 316 KB Output is correct
28 Correct 2 ms 468 KB Output is correct
29 Correct 3 ms 468 KB Output is correct
30 Correct 3 ms 448 KB Output is correct
31 Correct 3 ms 468 KB Output is correct
32 Correct 3 ms 468 KB Output is correct
33 Correct 3 ms 440 KB Output is correct
34 Correct 2 ms 468 KB Output is correct
35 Correct 3 ms 468 KB Output is correct
36 Correct 2 ms 460 KB Output is correct
37 Correct 2 ms 444 KB Output is correct
38 Correct 2 ms 468 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 304 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 312 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 308 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 312 KB Output is correct
14 Correct 1 ms 304 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 308 KB Output is correct
18 Correct 1 ms 308 KB Output is correct
19 Correct 381 ms 11200 KB Output is correct
20 Correct 315 ms 11088 KB Output is correct
21 Correct 314 ms 11260 KB Output is correct
22 Correct 243 ms 11212 KB Output is correct
23 Correct 346 ms 11900 KB Output is correct
24 Correct 174 ms 10792 KB Output is correct
25 Correct 240 ms 19148 KB Output is correct
26 Correct 159 ms 18508 KB Output is correct
27 Correct 325 ms 22900 KB Output is correct
28 Correct 1142 ms 61880 KB Output is correct
29 Correct 1138 ms 61932 KB Output is correct
30 Correct 363 ms 22908 KB Output is correct
31 Correct 385 ms 22912 KB Output is correct
32 Correct 465 ms 22964 KB Output is correct
33 Correct 640 ms 22128 KB Output is correct
34 Correct 969 ms 44256 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 304 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 312 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 308 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 312 KB Output is correct
14 Correct 1 ms 304 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 308 KB Output is correct
18 Correct 1 ms 308 KB Output is correct
19 Correct 1 ms 284 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 2 ms 444 KB Output is correct
22 Correct 3 ms 468 KB Output is correct
23 Correct 3 ms 468 KB Output is correct
24 Correct 2 ms 468 KB Output is correct
25 Correct 2 ms 468 KB Output is correct
26 Correct 4 ms 468 KB Output is correct
27 Correct 2 ms 316 KB Output is correct
28 Correct 2 ms 468 KB Output is correct
29 Correct 3 ms 468 KB Output is correct
30 Correct 3 ms 448 KB Output is correct
31 Correct 3 ms 468 KB Output is correct
32 Correct 3 ms 468 KB Output is correct
33 Correct 3 ms 440 KB Output is correct
34 Correct 2 ms 468 KB Output is correct
35 Correct 3 ms 468 KB Output is correct
36 Correct 2 ms 460 KB Output is correct
37 Correct 2 ms 444 KB Output is correct
38 Correct 2 ms 468 KB Output is correct
39 Correct 381 ms 11200 KB Output is correct
40 Correct 315 ms 11088 KB Output is correct
41 Correct 314 ms 11260 KB Output is correct
42 Correct 243 ms 11212 KB Output is correct
43 Correct 346 ms 11900 KB Output is correct
44 Correct 174 ms 10792 KB Output is correct
45 Correct 240 ms 19148 KB Output is correct
46 Correct 159 ms 18508 KB Output is correct
47 Correct 325 ms 22900 KB Output is correct
48 Correct 1142 ms 61880 KB Output is correct
49 Correct 1138 ms 61932 KB Output is correct
50 Correct 363 ms 22908 KB Output is correct
51 Correct 385 ms 22912 KB Output is correct
52 Correct 465 ms 22964 KB Output is correct
53 Correct 640 ms 22128 KB Output is correct
54 Correct 969 ms 44256 KB Output is correct
55 Correct 31 ms 2132 KB Output is correct
56 Correct 18 ms 1340 KB Output is correct
57 Correct 178 ms 11460 KB Output is correct
58 Correct 65 ms 10360 KB Output is correct
59 Correct 354 ms 27908 KB Output is correct
60 Correct 1230 ms 59852 KB Output is correct
61 Correct 423 ms 24752 KB Output is correct
62 Correct 423 ms 22852 KB Output is correct
63 Correct 465 ms 22972 KB Output is correct
64 Correct 1295 ms 37440 KB Output is correct
65 Correct 1103 ms 44908 KB Output is correct
66 Correct 1176 ms 62136 KB Output is correct
67 Correct 181 ms 21808 KB Output is correct
68 Correct 520 ms 38516 KB Output is correct
69 Correct 530 ms 38792 KB Output is correct
70 Correct 549 ms 36768 KB Output is correct