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답안 #525562

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
525562 2022-02-12T00:51:39 Z mjhmjh1104 Mountains and Valleys (CCO20_day1problem3) C++17
3 / 25
 1425 ms 108372 KB 
#include <cstdio>
#include <vector>
#include <utility>
#include <algorithm>
using namespace std;

int n, m, dp[20][20971520];
vector<int> tree[200006];
vector<pair<int, int>> adj[200006];

int f(int x, int y) {
    if (dp[x][y] + 1) return dp[x][y];
    if (!y) return dp[x][y] = 0;
    dp[x][y] = (int)1e9;
    for (auto &i: adj[x]) dp[x][y] = min(dp[x][y], i.second + f(i.first, y & ~(1 << i.first)));
    for (auto &i: tree[x]) dp[x][y] = min(dp[x][y], 1 + f(i, y & ~(1 << i)));
    return dp[x][y];
}

int lt[5006][5006], dist[200006];

void dfs(int x, int y, int dist = 0, int prev = -1) {
    lt[y][x] = dist;
    for (auto &i: tree[x]) if (i != prev) dfs(i, y, dist + 1, x);
}

int dfs_dist(int x, int prev = -1) {
    int ret = x;
    for (auto &i: tree[x]) if (i != prev) {
        dist[i] = 1 + dist[x];
        int t = dfs_dist(i, x);
        if (dist[t] > dist[ret]) ret = t;
    }
    return ret;
}

int main() {
    scanf("%d%d", &n, &m);
    while (m--) {
        int x, y, w;
        scanf("%d%d%d", &x, &y, &w);
        if (w == 1) {
            tree[x].push_back(y);
            tree[y].push_back(x);
        } else {
            adj[x].push_back({ y, w });
            adj[y].push_back({ x, w });
        }
    }
    if (n <= 20) {
        for (int i = 0; i < n; i++) for (int j = 0; j < 1 << n; j++) dp[i][j] = -1;
        int res = (int)1e9;
        for (int i = 0; i < n; i++) res = min(res, f(i, (1 << n) - 1 ^ 1 << i));
        printf("%d", res);
        return 0;
    }
    for (int i = 0; i < n; i++) dfs(i, i);
    int t = dfs_dist(dist[0] = 0);
    dist[t] = 0;
    int zero = 2 * (n - 1) - dist[dfs_dist(t)], one = (int)1e9, two = (int)1e9, three = (int)1e9;
    for (int i = 0; i < n; i++) for (auto &j: adj[i]) if (i < j.first) one = min(one, j.second + 2 * (n - 1) - lt[i][j.first]);
    for (int i = 0; i < n; i++) for (auto &j: adj[i]) if (i < j.first) for (int k = 0; k < n; k++) for (auto &l: adj[k]) if (k < l.first) {
        two = min(two, j.second + 2 * (n - 1) - lt[i][l.first] - lt[k][j.first]);
        two = min(two, j.second + 2 * (n - 1) - lt[i][k] - lt[l.first][j.first]);
    }
    printf("%d", min({ zero, one, two, three }));
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:53:66: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
   53 |         for (int i = 0; i < n; i++) res = min(res, f(i, (1 << n) - 1 ^ 1 << i));
      |                                                         ~~~~~~~~~^~~
Main.cpp:38:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp:41:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |         scanf("%d%d%d", &x, &y, &w);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
1.0 / 1.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 9676 KB Output is correct
2 Correct 5 ms 9676 KB Output is correct
3 Correct 5 ms 9676 KB Output is correct
4 Correct 5 ms 9736 KB Output is correct
5 Correct 5 ms 9628 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 7 ms 9676 KB Output is correct
8 Correct 5 ms 9676 KB Output is correct
9 Correct 5 ms 9676 KB Output is correct
10 Correct 5 ms 9676 KB Output is correct
11 Correct 5 ms 9676 KB Output is correct
12 Correct 6 ms 9676 KB Output is correct
13 Correct 7 ms 9676 KB Output is correct
14 Correct 5 ms 9676 KB Output is correct
15 Correct 6 ms 9676 KB Output is correct

Subtask #2
2.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 9676 KB Output is correct
2 Correct 5 ms 9676 KB Output is correct
3 Correct 5 ms 9676 KB Output is correct
4 Correct 5 ms 9736 KB Output is correct
5 Correct 5 ms 9628 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 7 ms 9676 KB Output is correct
8 Correct 5 ms 9676 KB Output is correct
9 Correct 5 ms 9676 KB Output is correct
10 Correct 5 ms 9676 KB Output is correct
11 Correct 5 ms 9676 KB Output is correct
12 Correct 6 ms 9676 KB Output is correct
13 Correct 7 ms 9676 KB Output is correct
14 Correct 5 ms 9676 KB Output is correct
15 Correct 6 ms 9676 KB Output is correct
16 Correct 5 ms 9676 KB Output is correct
17 Correct 7 ms 9676 KB Output is correct
18 Correct 7 ms 9676 KB Output is correct
19 Correct 5 ms 9932 KB Output is correct
20 Correct 6 ms 11724 KB Output is correct
21 Correct 6 ms 11724 KB Output is correct
22 Correct 183 ms 91844 KB Output is correct
23 Correct 47 ms 48812 KB Output is correct
24 Correct 44 ms 48716 KB Output is correct
25 Correct 34 ms 28236 KB Output is correct
26 Correct 58 ms 28248 KB Output is correct
27 Correct 295 ms 91948 KB Output is correct
28 Correct 28 ms 28264 KB Output is correct
29 Correct 30 ms 28236 KB Output is correct
30 Correct 32 ms 28236 KB Output is correct
31 Correct 28 ms 28236 KB Output is correct
32 Correct 16 ms 11716 KB Output is correct
33 Correct 6 ms 9676 KB Output is correct
34 Correct 14 ms 28256 KB Output is correct
35 Correct 15 ms 28192 KB Output is correct

Subtask #3
0.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1425 ms 108372 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 9676 KB Output is correct
2 Correct 5 ms 9676 KB Output is correct
3 Correct 5 ms 9676 KB Output is correct
4 Correct 5 ms 9736 KB Output is correct
5 Correct 5 ms 9628 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 7 ms 9676 KB Output is correct
8 Correct 5 ms 9676 KB Output is correct
9 Correct 5 ms 9676 KB Output is correct
10 Correct 5 ms 9676 KB Output is correct
11 Correct 5 ms 9676 KB Output is correct
12 Correct 6 ms 9676 KB Output is correct
13 Correct 7 ms 9676 KB Output is correct
14 Correct 5 ms 9676 KB Output is correct
15 Correct 6 ms 9676 KB Output is correct
16 Correct 5 ms 9676 KB Output is correct
17 Correct 7 ms 9676 KB Output is correct
18 Correct 7 ms 9676 KB Output is correct
19 Correct 5 ms 9932 KB Output is correct
20 Correct 6 ms 11724 KB Output is correct
21 Correct 6 ms 11724 KB Output is correct
22 Correct 183 ms 91844 KB Output is correct
23 Correct 47 ms 48812 KB Output is correct
24 Correct 44 ms 48716 KB Output is correct
25 Correct 34 ms 28236 KB Output is correct
26 Correct 58 ms 28248 KB Output is correct
27 Correct 295 ms 91948 KB Output is correct
28 Correct 28 ms 28264 KB Output is correct
29 Correct 30 ms 28236 KB Output is correct
30 Correct 32 ms 28236 KB Output is correct
31 Correct 28 ms 28236 KB Output is correct
32 Correct 16 ms 11716 KB Output is correct
33 Correct 6 ms 9676 KB Output is correct
34 Correct 14 ms 28256 KB Output is correct
35 Correct 15 ms 28192 KB Output is correct
36 Incorrect 5 ms 10060 KB Output isn't correct
37 Halted 0 ms 0 KB -

Subtask #5
0.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 9676 KB Output is correct
2 Correct 5 ms 9676 KB Output is correct
3 Correct 5 ms 9676 KB Output is correct
4 Correct 5 ms 9736 KB Output is correct
5 Correct 5 ms 9628 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 7 ms 9676 KB Output is correct
8 Correct 5 ms 9676 KB Output is correct
9 Correct 5 ms 9676 KB Output is correct
10 Correct 5 ms 9676 KB Output is correct
11 Correct 5 ms 9676 KB Output is correct
12 Correct 6 ms 9676 KB Output is correct
13 Correct 7 ms 9676 KB Output is correct
14 Correct 5 ms 9676 KB Output is correct
15 Correct 6 ms 9676 KB Output is correct
16 Correct 5 ms 9676 KB Output is correct
17 Correct 7 ms 9676 KB Output is correct
18 Correct 7 ms 9676 KB Output is correct
19 Correct 5 ms 9932 KB Output is correct
20 Correct 6 ms 11724 KB Output is correct
21 Correct 6 ms 11724 KB Output is correct
22 Correct 183 ms 91844 KB Output is correct
23 Correct 47 ms 48812 KB Output is correct
24 Correct 44 ms 48716 KB Output is correct
25 Correct 34 ms 28236 KB Output is correct
26 Correct 58 ms 28248 KB Output is correct
27 Correct 295 ms 91948 KB Output is correct
28 Correct 28 ms 28264 KB Output is correct
29 Correct 30 ms 28236 KB Output is correct
30 Correct 32 ms 28236 KB Output is correct
31 Correct 28 ms 28236 KB Output is correct
32 Correct 16 ms 11716 KB Output is correct
33 Correct 6 ms 9676 KB Output is correct
34 Correct 14 ms 28256 KB Output is correct
35 Correct 15 ms 28192 KB Output is correct
36 Incorrect 5 ms 10060 KB Output isn't correct
37 Halted 0 ms 0 KB -

Subtask #6
0.0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 9676 KB Output is correct
2 Correct 5 ms 9676 KB Output is correct
3 Correct 5 ms 9676 KB Output is correct
4 Correct 5 ms 9736 KB Output is correct
5 Correct 5 ms 9628 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 7 ms 9676 KB Output is correct
8 Correct 5 ms 9676 KB Output is correct
9 Correct 5 ms 9676 KB Output is correct
10 Correct 5 ms 9676 KB Output is correct
11 Correct 5 ms 9676 KB Output is correct
12 Correct 6 ms 9676 KB Output is correct
13 Correct 7 ms 9676 KB Output is correct
14 Correct 5 ms 9676 KB Output is correct
15 Correct 6 ms 9676 KB Output is correct
16 Correct 5 ms 9676 KB Output is correct
17 Correct 7 ms 9676 KB Output is correct
18 Correct 7 ms 9676 KB Output is correct
19 Correct 5 ms 9932 KB Output is correct
20 Correct 6 ms 11724 KB Output is correct
21 Correct 6 ms 11724 KB Output is correct
22 Correct 183 ms 91844 KB Output is correct
23 Correct 47 ms 48812 KB Output is correct
24 Correct 44 ms 48716 KB Output is correct
25 Correct 34 ms 28236 KB Output is correct
26 Correct 58 ms 28248 KB Output is correct
27 Correct 295 ms 91948 KB Output is correct
28 Correct 28 ms 28264 KB Output is correct
29 Correct 30 ms 28236 KB Output is correct
30 Correct 32 ms 28236 KB Output is correct
31 Correct 28 ms 28236 KB Output is correct
32 Correct 16 ms 11716 KB Output is correct
33 Correct 6 ms 9676 KB Output is correct
34 Correct 14 ms 28256 KB Output is correct
35 Correct 15 ms 28192 KB Output is correct
36 Incorrect 1425 ms 108372 KB Output isn't correct
37 Halted 0 ms 0 KB -

Subtask #7
0.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 9676 KB Output is correct
2 Correct 5 ms 9676 KB Output is correct
3 Correct 5 ms 9676 KB Output is correct
4 Correct 5 ms 9736 KB Output is correct
5 Correct 5 ms 9628 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 7 ms 9676 KB Output is correct
8 Correct 5 ms 9676 KB Output is correct
9 Correct 5 ms 9676 KB Output is correct
10 Correct 5 ms 9676 KB Output is correct
11 Correct 5 ms 9676 KB Output is correct
12 Correct 6 ms 9676 KB Output is correct
13 Correct 7 ms 9676 KB Output is correct
14 Correct 5 ms 9676 KB Output is correct
15 Correct 6 ms 9676 KB Output is correct
16 Correct 5 ms 9676 KB Output is correct
17 Correct 7 ms 9676 KB Output is correct
18 Correct 7 ms 9676 KB Output is correct
19 Correct 5 ms 9932 KB Output is correct
20 Correct 6 ms 11724 KB Output is correct
21 Correct 6 ms 11724 KB Output is correct
22 Correct 183 ms 91844 KB Output is correct
23 Correct 47 ms 48812 KB Output is correct
24 Correct 44 ms 48716 KB Output is correct
25 Correct 34 ms 28236 KB Output is correct
26 Correct 58 ms 28248 KB Output is correct
27 Correct 295 ms 91948 KB Output is correct
28 Correct 28 ms 28264 KB Output is correct
29 Correct 30 ms 28236 KB Output is correct
30 Correct 32 ms 28236 KB Output is correct
31 Correct 28 ms 28236 KB Output is correct
32 Correct 16 ms 11716 KB Output is correct
33 Correct 6 ms 9676 KB Output is correct
34 Correct 14 ms 28256 KB Output is correct
35 Correct 15 ms 28192 KB Output is correct
36 Incorrect 1425 ms 108372 KB Output isn't correct
37 Halted 0 ms 0 KB -

Subtask #8
0.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 9676 KB Output is correct
2 Correct 5 ms 9676 KB Output is correct
3 Correct 5 ms 9676 KB Output is correct
4 Correct 5 ms 9736 KB Output is correct
5 Correct 5 ms 9628 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 7 ms 9676 KB Output is correct
8 Correct 5 ms 9676 KB Output is correct
9 Correct 5 ms 9676 KB Output is correct
10 Correct 5 ms 9676 KB Output is correct
11 Correct 5 ms 9676 KB Output is correct
12 Correct 6 ms 9676 KB Output is correct
13 Correct 7 ms 9676 KB Output is correct
14 Correct 5 ms 9676 KB Output is correct
15 Correct 6 ms 9676 KB Output is correct
16 Correct 5 ms 9676 KB Output is correct
17 Correct 7 ms 9676 KB Output is correct
18 Correct 7 ms 9676 KB Output is correct
19 Correct 5 ms 9932 KB Output is correct
20 Correct 6 ms 11724 KB Output is correct
21 Correct 6 ms 11724 KB Output is correct
22 Correct 183 ms 91844 KB Output is correct
23 Correct 47 ms 48812 KB Output is correct
24 Correct 44 ms 48716 KB Output is correct
25 Correct 34 ms 28236 KB Output is correct
26 Correct 58 ms 28248 KB Output is correct
27 Correct 295 ms 91948 KB Output is correct
28 Correct 28 ms 28264 KB Output is correct
29 Correct 30 ms 28236 KB Output is correct
30 Correct 32 ms 28236 KB Output is correct
31 Correct 28 ms 28236 KB Output is correct
32 Correct 16 ms 11716 KB Output is correct
33 Correct 6 ms 9676 KB Output is correct
34 Correct 14 ms 28256 KB Output is correct
35 Correct 15 ms 28192 KB Output is correct
36 Incorrect 1425 ms 108372 KB Output isn't correct
37 Halted 0 ms 0 KB -