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Submission #525560

# Submission time Handle Problem Language Result Execution time Memory
525560 2022-02-12T00:49:13 Z mjhmjh1104 Mountains and Valleys (CCO20_day1problem3) C++17
3 / 25
 271 ms 91912 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);
    for (int i = 0; i < n; i++) for (int j = 0; j < 1 << n; j++) dp[i][j] = -1;
    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) {
        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]);
    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:42:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |         scanf("%d%d%d", &x, &y, &w);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
1.0 / 1.0

# Verdict Execution time Memory 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 6 ms 9816 KB Output is correct
5 Correct 5 ms 9676 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 6 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 5 ms 9732 KB Output is correct
13 Correct 5 ms 9676 KB Output is correct
14 Correct 5 ms 9676 KB Output is correct
15 Correct 5 ms 9676 KB Output is correct

Subtask #2
2.0 / 2.0

# Verdict Execution time Memory 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 6 ms 9816 KB Output is correct
5 Correct 5 ms 9676 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 6 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 5 ms 9732 KB Output is correct
13 Correct 5 ms 9676 KB Output is correct
14 Correct 5 ms 9676 KB Output is correct
15 Correct 5 ms 9676 KB Output is correct
16 Correct 5 ms 9676 KB Output is correct
17 Correct 5 ms 9676 KB Output is correct
18 Correct 5 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 11716 KB Output is correct
22 Correct 181 ms 91912 KB Output is correct
23 Correct 65 ms 48720 KB Output is correct
24 Correct 39 ms 48736 KB Output is correct
25 Correct 32 ms 28156 KB Output is correct
26 Correct 56 ms 28248 KB Output is correct
27 Correct 271 ms 91880 KB Output is correct
28 Correct 20 ms 28268 KB Output is correct
29 Correct 38 ms 28248 KB Output is correct
30 Correct 22 ms 28264 KB Output is correct
31 Correct 27 ms 28264 KB Output is correct
32 Correct 13 ms 11724 KB Output is correct
33 Correct 5 ms 9676 KB Output is correct
34 Correct 13 ms 28200 KB Output is correct
35 Correct 14 ms 28236 KB Output is correct

Subtask #3
0.0 / 2.0

# Verdict Execution time Memory Grader output
1 Runtime error 19 ms 19464 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #4
0.0 / 6.0

# Verdict Execution time Memory 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 6 ms 9816 KB Output is correct
5 Correct 5 ms 9676 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 6 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 5 ms 9732 KB Output is correct
13 Correct 5 ms 9676 KB Output is correct
14 Correct 5 ms 9676 KB Output is correct
15 Correct 5 ms 9676 KB Output is correct
16 Correct 5 ms 9676 KB Output is correct
17 Correct 5 ms 9676 KB Output is correct
18 Correct 5 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 11716 KB Output is correct
22 Correct 181 ms 91912 KB Output is correct
23 Correct 65 ms 48720 KB Output is correct
24 Correct 39 ms 48736 KB Output is correct
25 Correct 32 ms 28156 KB Output is correct
26 Correct 56 ms 28248 KB Output is correct
27 Correct 271 ms 91880 KB Output is correct
28 Correct 20 ms 28268 KB Output is correct
29 Correct 38 ms 28248 KB Output is correct
30 Correct 22 ms 28264 KB Output is correct
31 Correct 27 ms 28264 KB Output is correct
32 Correct 13 ms 11724 KB Output is correct
33 Correct 5 ms 9676 KB Output is correct
34 Correct 13 ms 28200 KB Output is correct
35 Correct 14 ms 28236 KB Output is correct
36 Runtime error 19 ms 19532 KB Execution killed with signal 11
37 Halted 0 ms 0 KB -

Subtask #5
0.0 / 2.0

# Verdict Execution time Memory 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 6 ms 9816 KB Output is correct
5 Correct 5 ms 9676 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 6 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 5 ms 9732 KB Output is correct
13 Correct 5 ms 9676 KB Output is correct
14 Correct 5 ms 9676 KB Output is correct
15 Correct 5 ms 9676 KB Output is correct
16 Correct 5 ms 9676 KB Output is correct
17 Correct 5 ms 9676 KB Output is correct
18 Correct 5 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 11716 KB Output is correct
22 Correct 181 ms 91912 KB Output is correct
23 Correct 65 ms 48720 KB Output is correct
24 Correct 39 ms 48736 KB Output is correct
25 Correct 32 ms 28156 KB Output is correct
26 Correct 56 ms 28248 KB Output is correct
27 Correct 271 ms 91880 KB Output is correct
28 Correct 20 ms 28268 KB Output is correct
29 Correct 38 ms 28248 KB Output is correct
30 Correct 22 ms 28264 KB Output is correct
31 Correct 27 ms 28264 KB Output is correct
32 Correct 13 ms 11724 KB Output is correct
33 Correct 5 ms 9676 KB Output is correct
34 Correct 13 ms 28200 KB Output is correct
35 Correct 14 ms 28236 KB Output is correct
36 Runtime error 19 ms 19532 KB Execution killed with signal 11
37 Halted 0 ms 0 KB -

Subtask #6
0.0 / 3.0

# Verdict Execution time Memory 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 6 ms 9816 KB Output is correct
5 Correct 5 ms 9676 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 6 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 5 ms 9732 KB Output is correct
13 Correct 5 ms 9676 KB Output is correct
14 Correct 5 ms 9676 KB Output is correct
15 Correct 5 ms 9676 KB Output is correct
16 Correct 5 ms 9676 KB Output is correct
17 Correct 5 ms 9676 KB Output is correct
18 Correct 5 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 11716 KB Output is correct
22 Correct 181 ms 91912 KB Output is correct
23 Correct 65 ms 48720 KB Output is correct
24 Correct 39 ms 48736 KB Output is correct
25 Correct 32 ms 28156 KB Output is correct
26 Correct 56 ms 28248 KB Output is correct
27 Correct 271 ms 91880 KB Output is correct
28 Correct 20 ms 28268 KB Output is correct
29 Correct 38 ms 28248 KB Output is correct
30 Correct 22 ms 28264 KB Output is correct
31 Correct 27 ms 28264 KB Output is correct
32 Correct 13 ms 11724 KB Output is correct
33 Correct 5 ms 9676 KB Output is correct
34 Correct 13 ms 28200 KB Output is correct
35 Correct 14 ms 28236 KB Output is correct
36 Runtime error 19 ms 19464 KB Execution killed with signal 11
37 Halted 0 ms 0 KB -

Subtask #7
0.0 / 5.0

# Verdict Execution time Memory 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 6 ms 9816 KB Output is correct
5 Correct 5 ms 9676 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 6 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 5 ms 9732 KB Output is correct
13 Correct 5 ms 9676 KB Output is correct
14 Correct 5 ms 9676 KB Output is correct
15 Correct 5 ms 9676 KB Output is correct
16 Correct 5 ms 9676 KB Output is correct
17 Correct 5 ms 9676 KB Output is correct
18 Correct 5 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 11716 KB Output is correct
22 Correct 181 ms 91912 KB Output is correct
23 Correct 65 ms 48720 KB Output is correct
24 Correct 39 ms 48736 KB Output is correct
25 Correct 32 ms 28156 KB Output is correct
26 Correct 56 ms 28248 KB Output is correct
27 Correct 271 ms 91880 KB Output is correct
28 Correct 20 ms 28268 KB Output is correct
29 Correct 38 ms 28248 KB Output is correct
30 Correct 22 ms 28264 KB Output is correct
31 Correct 27 ms 28264 KB Output is correct
32 Correct 13 ms 11724 KB Output is correct
33 Correct 5 ms 9676 KB Output is correct
34 Correct 13 ms 28200 KB Output is correct
35 Correct 14 ms 28236 KB Output is correct
36 Runtime error 19 ms 19464 KB Execution killed with signal 11
37 Halted 0 ms 0 KB -

Subtask #8
0.0 / 4.0

# Verdict Execution time Memory 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 6 ms 9816 KB Output is correct
5 Correct 5 ms 9676 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 6 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 5 ms 9732 KB Output is correct
13 Correct 5 ms 9676 KB Output is correct
14 Correct 5 ms 9676 KB Output is correct
15 Correct 5 ms 9676 KB Output is correct
16 Correct 5 ms 9676 KB Output is correct
17 Correct 5 ms 9676 KB Output is correct
18 Correct 5 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 11716 KB Output is correct
22 Correct 181 ms 91912 KB Output is correct
23 Correct 65 ms 48720 KB Output is correct
24 Correct 39 ms 48736 KB Output is correct
25 Correct 32 ms 28156 KB Output is correct
26 Correct 56 ms 28248 KB Output is correct
27 Correct 271 ms 91880 KB Output is correct
28 Correct 20 ms 28268 KB Output is correct
29 Correct 38 ms 28248 KB Output is correct
30 Correct 22 ms 28264 KB Output is correct
31 Correct 27 ms 28264 KB Output is correct
32 Correct 13 ms 11724 KB Output is correct
33 Correct 5 ms 9676 KB Output is correct
34 Correct 13 ms 28200 KB Output is correct
35 Correct 14 ms 28236 KB Output is correct
36 Runtime error 19 ms 19464 KB Execution killed with signal 11
37 Halted 0 ms 0 KB -