oj.uz

답안 #684254

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
684254 2023-01-20T18:35:46 Z finn__ 경주 (Race) (IOI11_race) C++17
100 / 100
 374 ms 103092 KB 
#include <bits/stdc++.h>
using namespace std;
#include "race.h"

vector<set<pair<int64_t, int64_t>>> s;
vector<pair<int64_t, int64_t>> c;
vector<vector<pair<int64_t, int64_t>>> g;
int64_t min_edges_num = INT_MAX;

void find_best(int64_t u, int64_t p, int64_t k)
{
    if (g[u].size() == 1 && g[u].front().first == p)
    {
        s[u].emplace(0, 0);
        c[u] = {0, 0};
        return;
    }

    int64_t max_v, max_size = 0, max_w;

    for (auto const &[v, w] : g[u])
        if (v != p)
        {
            find_best(v, u, k);
            if (s[v].size() >= max_size)
                max_v = v, max_size = s[v].size(), max_w = w;
        }

    swap(s[u], s[max_v]);
    swap(c[u], c[max_v]);
    c[u].first += max_w;
    c[u].second++;

    for (auto const &[v, w] : g[u])
        if (v != p && v != max_v)
        {
            for (auto const &[length, num_edges] : s[v])
            {
                auto it = s[u].lower_bound({k - (length + w + c[v].first) - c[u].first, INT_MIN});
                if (it != s[u].end() && it->first + c[u].first + length + w + c[v].first == k)
                    min_edges_num = min(min_edges_num, it->second + c[u].second + num_edges + 1 + c[v].second);
            }
            for (auto const &[length, num_edges] : s[v])
            {
                s[u].emplace(length + w + c[v].first - c[u].first,
                             num_edges + 1 + c[v].second - c[u].second);
            }
        }

    auto it = s[u].lower_bound({k - c[u].first, INT_MIN});
    if (it != s[u].end() && it->first + c[u].first == k)
        min_edges_num = min(min_edges_num, it->second + c[u].second);
    s[u].emplace(-c[u].first, -c[u].second);
}

int best_path(int N, int K, int H[][2], int L[])
{
    g = vector<vector<pair<int64_t, int64_t>>>(N);
    s = vector<set<pair<int64_t, int64_t>>>(N);
    c = vector<pair<int64_t, int64_t>>(N);

    for (int64_t i = 0; i < N - 1; i++)
    {
        g[H[i][0]].emplace_back(H[i][1], L[i]);
        g[H[i][1]].emplace_back(H[i][0], L[i]);
    }

    find_best(0, -1, K);
    return min_edges_num == INT_MAX ? -1 : min_edges_num;
}

Compilation message

race.cpp: In function 'void find_best(int64_t, int64_t, int64_t)':
race.cpp:25:29: warning: comparison of integer expressions of different signedness: 'std::set<std::pair<long int, long int> >::size_type' {aka 'long unsigned int'} and 'int64_t' {aka 'long int'} [-Wsign-compare]
   25 |             if (s[v].size() >= max_size)
      |                 ~~~~~~~~~~~~^~~~~~~~~~~
race.cpp:31:16: warning: 'max_w' may be used uninitialized in this function [-Wmaybe-uninitialized]
   31 |     c[u].first += max_w;
race.cpp:35:20: warning: 'max_v' may be used uninitialized in this function [-Wmaybe-uninitialized]
   35 |         if (v != p && v != max_v)
      |             ~~~~~~~^~~~~~~~~~~~~

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 308 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 0 ms 308 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 304 KB Output is correct
15 Correct 1 ms 304 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 308 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 0 ms 308 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 304 KB Output is correct
15 Correct 1 ms 304 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 308 KB Output is correct
20 Correct 0 ms 340 KB Output is correct
21 Correct 1 ms 596 KB Output is correct
22 Correct 2 ms 596 KB Output is correct
23 Correct 1 ms 596 KB Output is correct
24 Correct 1 ms 596 KB Output is correct
25 Correct 2 ms 572 KB Output is correct
26 Correct 2 ms 596 KB Output is correct
27 Correct 1 ms 468 KB Output is correct
28 Correct 2 ms 596 KB Output is correct
29 Correct 2 ms 576 KB Output is correct
30 Correct 2 ms 596 KB Output is correct
31 Correct 2 ms 596 KB Output is correct
32 Correct 2 ms 596 KB Output is correct
33 Correct 2 ms 596 KB Output is correct
34 Correct 1 ms 596 KB Output is correct
35 Correct 1 ms 596 KB Output is correct
36 Correct 1 ms 596 KB Output is correct
37 Correct 1 ms 596 KB Output is correct
38 Correct 1 ms 596 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 308 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 0 ms 308 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 304 KB Output is correct
15 Correct 1 ms 304 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 124 ms 32292 KB Output is correct
20 Correct 125 ms 32148 KB Output is correct
21 Correct 135 ms 31736 KB Output is correct
22 Correct 120 ms 30924 KB Output is correct
23 Correct 158 ms 46200 KB Output is correct
24 Correct 119 ms 34424 KB Output is correct
25 Correct 106 ms 36836 KB Output is correct
26 Correct 80 ms 44304 KB Output is correct
27 Correct 193 ms 49336 KB Output is correct
28 Correct 235 ms 88552 KB Output is correct
29 Correct 249 ms 86252 KB Output is correct
30 Correct 186 ms 49456 KB Output is correct
31 Correct 176 ms 49356 KB Output is correct
32 Correct 238 ms 49364 KB Output is correct
33 Correct 200 ms 45164 KB Output is correct
34 Correct 295 ms 77980 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 308 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 0 ms 308 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 304 KB Output is correct
15 Correct 1 ms 304 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 308 KB Output is correct
20 Correct 0 ms 340 KB Output is correct
21 Correct 1 ms 596 KB Output is correct
22 Correct 2 ms 596 KB Output is correct
23 Correct 1 ms 596 KB Output is correct
24 Correct 1 ms 596 KB Output is correct
25 Correct 2 ms 572 KB Output is correct
26 Correct 2 ms 596 KB Output is correct
27 Correct 1 ms 468 KB Output is correct
28 Correct 2 ms 596 KB Output is correct
29 Correct 2 ms 576 KB Output is correct
30 Correct 2 ms 596 KB Output is correct
31 Correct 2 ms 596 KB Output is correct
32 Correct 2 ms 596 KB Output is correct
33 Correct 2 ms 596 KB Output is correct
34 Correct 1 ms 596 KB Output is correct
35 Correct 1 ms 596 KB Output is correct
36 Correct 1 ms 596 KB Output is correct
37 Correct 1 ms 596 KB Output is correct
38 Correct 1 ms 596 KB Output is correct
39 Correct 124 ms 32292 KB Output is correct
40 Correct 125 ms 32148 KB Output is correct
41 Correct 135 ms 31736 KB Output is correct
42 Correct 120 ms 30924 KB Output is correct
43 Correct 158 ms 46200 KB Output is correct
44 Correct 119 ms 34424 KB Output is correct
45 Correct 106 ms 36836 KB Output is correct
46 Correct 80 ms 44304 KB Output is correct
47 Correct 193 ms 49336 KB Output is correct
48 Correct 235 ms 88552 KB Output is correct
49 Correct 249 ms 86252 KB Output is correct
50 Correct 186 ms 49456 KB Output is correct
51 Correct 176 ms 49356 KB Output is correct
52 Correct 238 ms 49364 KB Output is correct
53 Correct 200 ms 45164 KB Output is correct
54 Correct 295 ms 77980 KB Output is correct
55 Correct 11 ms 4308 KB Output is correct
56 Correct 8 ms 3036 KB Output is correct
57 Correct 71 ms 28072 KB Output is correct
58 Correct 50 ms 22076 KB Output is correct
59 Correct 74 ms 44244 KB Output is correct
60 Correct 222 ms 86904 KB Output is correct
61 Correct 222 ms 55160 KB Output is correct
62 Correct 184 ms 49428 KB Output is correct
63 Correct 210 ms 49392 KB Output is correct
64 Correct 369 ms 103092 KB Output is correct
65 Correct 374 ms 97332 KB Output is correct
66 Correct 257 ms 81236 KB Output is correct
67 Correct 171 ms 45292 KB Output is correct
68 Correct 281 ms 65856 KB Output is correct
69 Correct 284 ms 66492 KB Output is correct
70 Correct 274 ms 62968 KB Output is correct