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답안 #525817

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
525817 2022-02-13T00:26:10 Z mjhmjh1104 Mountains and Valleys (CCO20_day1problem3) C++17
5 / 25
 3230 ms 108772 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 par[200006], sz[200006];
bool cl[200006];
 
int dfs(int x, int prev = -1) {
    par[x] = prev;
    sz[x] = 1;
    for (auto &i: tree[x]) if (i != prev) {
        sz[x] = max(sz[x], dfs(i, x) + 1);
    }
    return sz[x];
}

int lt[5006][5006];
 
void dfs_lt(int x, int y, int dist = 0, int prev = -1) {
    lt[y][x] = dist;
    for (auto &i: tree[x]) if (i != prev) dfs_lt(i, y, dist + 1, x);
}

int dist[200006];
 
int dfs_dist(int x, int prev = -1) {
    vector<int> v;
    int ret = 0;
    dist[x] = 0;
    for (auto &i: tree[x]) if (i != prev) {
        v.push_back(dfs_dist(i, x) + 1);
        ret = max(ret, v.back());
        dist[x] = max(dist[x], dist[i]);
    }
    sort(v.rbegin(), v.rend());
    if (!v.empty()) dist[x] = max(dist[x], v[0]);
    if ((int)v.size() > 1) dist[x] = max(dist[x], v[0] + v[1]);
    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_lt(i, i);
    dfs_dist(0);
    int zero = 2 * (n - 1) - dist[0], one = (int)1e9;
    for (int i = 0; i < n; i++) for (auto &j: adj[i]) if (i < j.first) {
        int curr = j.second + 2 * (n - 1) - lt[i][j.first] - 1;
        dfs(i);
        int x = j.first, pv = -1;
        vector<pair<int, int>> v;
        int y = -1, T = 0;
        dfs_dist(i);
        while (x != -1) {
            for (auto &k: tree[x]) {
                if (k != pv && k != par[x]) {
                    if (sz[k]) v.push_back({ sz[k], T });
                    y = max(y, dist[k] - 1);
                }
                T++;
            }
            pv = x;
            x = par[x];
        }
        int ans = 0;
        for (int i = 0; i < (int)v.size(); i++) {
            if (i) ans -= v[i].second - v[i - 1].second;
            y = max(y, ans + v[i].first + 1);
            ans = max(ans, v[i].first);
        }
        curr -= y;
        one = min(one, curr);
    }
    printf("%d", min(zero, one));
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:72:66: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
   72 |         for (int i = 0; i < n; i++) res = min(res, f(i, (1 << n) - 1 ^ 1 << i));
      |                                                         ~~~~~~~~~^~~
Main.cpp:57:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp:60:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |         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 9724 KB Output is correct
3 Correct 4 ms 9676 KB Output is correct
4 Correct 5 ms 9620 KB Output is correct
5 Correct 5 ms 9676 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 4 ms 9676 KB Output is correct
8 Correct 5 ms 9676 KB Output is correct
9 Correct 5 ms 9740 KB Output is correct
10 Correct 4 ms 9676 KB Output is correct
11 Correct 5 ms 9676 KB Output is correct
12 Correct 5 ms 9676 KB Output is correct
13 Correct 5 ms 9676 KB Output is correct
14 Correct 4 ms 9676 KB Output is correct
15 Correct 4 ms 9624 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 9724 KB Output is correct
3 Correct 4 ms 9676 KB Output is correct
4 Correct 5 ms 9620 KB Output is correct
5 Correct 5 ms 9676 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 4 ms 9676 KB Output is correct
8 Correct 5 ms 9676 KB Output is correct
9 Correct 5 ms 9740 KB Output is correct
10 Correct 4 ms 9676 KB Output is correct
11 Correct 5 ms 9676 KB Output is correct
12 Correct 5 ms 9676 KB Output is correct
13 Correct 5 ms 9676 KB Output is correct
14 Correct 4 ms 9676 KB Output is correct
15 Correct 4 ms 9624 KB Output is correct
16 Correct 4 ms 9676 KB Output is correct
17 Correct 4 ms 9676 KB Output is correct
18 Correct 6 ms 9676 KB Output is correct
19 Correct 5 ms 9960 KB Output is correct
20 Correct 5 ms 11724 KB Output is correct
21 Correct 5 ms 11724 KB Output is correct
22 Correct 170 ms 91844 KB Output is correct
23 Correct 43 ms 48716 KB Output is correct
24 Correct 40 ms 48808 KB Output is correct
25 Correct 31 ms 28236 KB Output is correct
26 Correct 57 ms 28248 KB Output is correct
27 Correct 293 ms 91912 KB Output is correct
28 Correct 18 ms 28268 KB Output is correct
29 Correct 30 ms 28264 KB Output is correct
30 Correct 21 ms 28236 KB Output is correct
31 Correct 27 ms 28248 KB Output is correct
32 Correct 10 ms 11728 KB Output is correct
33 Correct 5 ms 9676 KB Output is correct
34 Correct 13 ms 28236 KB Output is correct
35 Correct 12 ms 28236 KB Output is correct

Subtask #3
2.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2948 ms 108772 KB Output is correct
2 Correct 2995 ms 108704 KB Output is correct
3 Correct 2860 ms 108396 KB Output is correct
4 Correct 2746 ms 108272 KB Output is correct
5 Correct 2627 ms 108316 KB Output is correct
6 Correct 1122 ms 108156 KB Output is correct
7 Correct 2938 ms 108580 KB Output is correct
8 Correct 3230 ms 108396 KB Output is correct
9 Correct 3168 ms 108532 KB Output is correct
10 Correct 2972 ms 108276 KB Output is correct
11 Correct 2778 ms 108320 KB Output is correct
12 Correct 2662 ms 108096 KB Output is correct
13 Correct 2822 ms 108320 KB Output is correct
14 Correct 2785 ms 108348 KB Output is correct

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 9724 KB Output is correct
3 Correct 4 ms 9676 KB Output is correct
4 Correct 5 ms 9620 KB Output is correct
5 Correct 5 ms 9676 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 4 ms 9676 KB Output is correct
8 Correct 5 ms 9676 KB Output is correct
9 Correct 5 ms 9740 KB Output is correct
10 Correct 4 ms 9676 KB Output is correct
11 Correct 5 ms 9676 KB Output is correct
12 Correct 5 ms 9676 KB Output is correct
13 Correct 5 ms 9676 KB Output is correct
14 Correct 4 ms 9676 KB Output is correct
15 Correct 4 ms 9624 KB Output is correct
16 Correct 4 ms 9676 KB Output is correct
17 Correct 4 ms 9676 KB Output is correct
18 Correct 6 ms 9676 KB Output is correct
19 Correct 5 ms 9960 KB Output is correct
20 Correct 5 ms 11724 KB Output is correct
21 Correct 5 ms 11724 KB Output is correct
22 Correct 170 ms 91844 KB Output is correct
23 Correct 43 ms 48716 KB Output is correct
24 Correct 40 ms 48808 KB Output is correct
25 Correct 31 ms 28236 KB Output is correct
26 Correct 57 ms 28248 KB Output is correct
27 Correct 293 ms 91912 KB Output is correct
28 Correct 18 ms 28268 KB Output is correct
29 Correct 30 ms 28264 KB Output is correct
30 Correct 21 ms 28236 KB Output is correct
31 Correct 27 ms 28248 KB Output is correct
32 Correct 10 ms 11728 KB Output is correct
33 Correct 5 ms 9676 KB Output is correct
34 Correct 13 ms 28236 KB Output is correct
35 Correct 12 ms 28236 KB Output is correct
36 Correct 6 ms 10060 KB Output is correct
37 Correct 6 ms 10060 KB Output is correct
38 Correct 9 ms 10060 KB Output is correct
39 Incorrect 5 ms 10088 KB Output isn't correct
40 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 9724 KB Output is correct
3 Correct 4 ms 9676 KB Output is correct
4 Correct 5 ms 9620 KB Output is correct
5 Correct 5 ms 9676 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 4 ms 9676 KB Output is correct
8 Correct 5 ms 9676 KB Output is correct
9 Correct 5 ms 9740 KB Output is correct
10 Correct 4 ms 9676 KB Output is correct
11 Correct 5 ms 9676 KB Output is correct
12 Correct 5 ms 9676 KB Output is correct
13 Correct 5 ms 9676 KB Output is correct
14 Correct 4 ms 9676 KB Output is correct
15 Correct 4 ms 9624 KB Output is correct
16 Correct 4 ms 9676 KB Output is correct
17 Correct 4 ms 9676 KB Output is correct
18 Correct 6 ms 9676 KB Output is correct
19 Correct 5 ms 9960 KB Output is correct
20 Correct 5 ms 11724 KB Output is correct
21 Correct 5 ms 11724 KB Output is correct
22 Correct 170 ms 91844 KB Output is correct
23 Correct 43 ms 48716 KB Output is correct
24 Correct 40 ms 48808 KB Output is correct
25 Correct 31 ms 28236 KB Output is correct
26 Correct 57 ms 28248 KB Output is correct
27 Correct 293 ms 91912 KB Output is correct
28 Correct 18 ms 28268 KB Output is correct
29 Correct 30 ms 28264 KB Output is correct
30 Correct 21 ms 28236 KB Output is correct
31 Correct 27 ms 28248 KB Output is correct
32 Correct 10 ms 11728 KB Output is correct
33 Correct 5 ms 9676 KB Output is correct
34 Correct 13 ms 28236 KB Output is correct
35 Correct 12 ms 28236 KB Output is correct
36 Correct 6 ms 10060 KB Output is correct
37 Correct 6 ms 10060 KB Output is correct
38 Correct 9 ms 10060 KB Output is correct
39 Incorrect 5 ms 10088 KB Output isn't correct
40 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 9724 KB Output is correct
3 Correct 4 ms 9676 KB Output is correct
4 Correct 5 ms 9620 KB Output is correct
5 Correct 5 ms 9676 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 4 ms 9676 KB Output is correct
8 Correct 5 ms 9676 KB Output is correct
9 Correct 5 ms 9740 KB Output is correct
10 Correct 4 ms 9676 KB Output is correct
11 Correct 5 ms 9676 KB Output is correct
12 Correct 5 ms 9676 KB Output is correct
13 Correct 5 ms 9676 KB Output is correct
14 Correct 4 ms 9676 KB Output is correct
15 Correct 4 ms 9624 KB Output is correct
16 Correct 4 ms 9676 KB Output is correct
17 Correct 4 ms 9676 KB Output is correct
18 Correct 6 ms 9676 KB Output is correct
19 Correct 5 ms 9960 KB Output is correct
20 Correct 5 ms 11724 KB Output is correct
21 Correct 5 ms 11724 KB Output is correct
22 Correct 170 ms 91844 KB Output is correct
23 Correct 43 ms 48716 KB Output is correct
24 Correct 40 ms 48808 KB Output is correct
25 Correct 31 ms 28236 KB Output is correct
26 Correct 57 ms 28248 KB Output is correct
27 Correct 293 ms 91912 KB Output is correct
28 Correct 18 ms 28268 KB Output is correct
29 Correct 30 ms 28264 KB Output is correct
30 Correct 21 ms 28236 KB Output is correct
31 Correct 27 ms 28248 KB Output is correct
32 Correct 10 ms 11728 KB Output is correct
33 Correct 5 ms 9676 KB Output is correct
34 Correct 13 ms 28236 KB Output is correct
35 Correct 12 ms 28236 KB Output is correct
36 Correct 2948 ms 108772 KB Output is correct
37 Correct 2995 ms 108704 KB Output is correct
38 Correct 2860 ms 108396 KB Output is correct
39 Correct 2746 ms 108272 KB Output is correct
40 Correct 2627 ms 108316 KB Output is correct
41 Correct 1122 ms 108156 KB Output is correct
42 Correct 2938 ms 108580 KB Output is correct
43 Correct 3230 ms 108396 KB Output is correct
44 Correct 3168 ms 108532 KB Output is correct
45 Correct 2972 ms 108276 KB Output is correct
46 Correct 2778 ms 108320 KB Output is correct
47 Correct 2662 ms 108096 KB Output is correct
48 Correct 2822 ms 108320 KB Output is correct
49 Correct 2785 ms 108348 KB Output is correct
50 Correct 6 ms 10060 KB Output is correct
51 Correct 6 ms 10060 KB Output is correct
52 Correct 9 ms 10060 KB Output is correct
53 Incorrect 5 ms 10088 KB Output isn't correct
54 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 9724 KB Output is correct
3 Correct 4 ms 9676 KB Output is correct
4 Correct 5 ms 9620 KB Output is correct
5 Correct 5 ms 9676 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 4 ms 9676 KB Output is correct
8 Correct 5 ms 9676 KB Output is correct
9 Correct 5 ms 9740 KB Output is correct
10 Correct 4 ms 9676 KB Output is correct
11 Correct 5 ms 9676 KB Output is correct
12 Correct 5 ms 9676 KB Output is correct
13 Correct 5 ms 9676 KB Output is correct
14 Correct 4 ms 9676 KB Output is correct
15 Correct 4 ms 9624 KB Output is correct
16 Correct 4 ms 9676 KB Output is correct
17 Correct 4 ms 9676 KB Output is correct
18 Correct 6 ms 9676 KB Output is correct
19 Correct 5 ms 9960 KB Output is correct
20 Correct 5 ms 11724 KB Output is correct
21 Correct 5 ms 11724 KB Output is correct
22 Correct 170 ms 91844 KB Output is correct
23 Correct 43 ms 48716 KB Output is correct
24 Correct 40 ms 48808 KB Output is correct
25 Correct 31 ms 28236 KB Output is correct
26 Correct 57 ms 28248 KB Output is correct
27 Correct 293 ms 91912 KB Output is correct
28 Correct 18 ms 28268 KB Output is correct
29 Correct 30 ms 28264 KB Output is correct
30 Correct 21 ms 28236 KB Output is correct
31 Correct 27 ms 28248 KB Output is correct
32 Correct 10 ms 11728 KB Output is correct
33 Correct 5 ms 9676 KB Output is correct
34 Correct 13 ms 28236 KB Output is correct
35 Correct 12 ms 28236 KB Output is correct
36 Correct 2948 ms 108772 KB Output is correct
37 Correct 2995 ms 108704 KB Output is correct
38 Correct 2860 ms 108396 KB Output is correct
39 Correct 2746 ms 108272 KB Output is correct
40 Correct 2627 ms 108316 KB Output is correct
41 Correct 1122 ms 108156 KB Output is correct
42 Correct 2938 ms 108580 KB Output is correct
43 Correct 3230 ms 108396 KB Output is correct
44 Correct 3168 ms 108532 KB Output is correct
45 Correct 2972 ms 108276 KB Output is correct
46 Correct 2778 ms 108320 KB Output is correct
47 Correct 2662 ms 108096 KB Output is correct
48 Correct 2822 ms 108320 KB Output is correct
49 Correct 2785 ms 108348 KB Output is correct
50 Correct 6 ms 10060 KB Output is correct
51 Correct 6 ms 10060 KB Output is correct
52 Correct 9 ms 10060 KB Output is correct
53 Incorrect 5 ms 10088 KB Output isn't correct
54 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 9724 KB Output is correct
3 Correct 4 ms 9676 KB Output is correct
4 Correct 5 ms 9620 KB Output is correct
5 Correct 5 ms 9676 KB Output is correct
6 Correct 5 ms 9676 KB Output is correct
7 Correct 4 ms 9676 KB Output is correct
8 Correct 5 ms 9676 KB Output is correct
9 Correct 5 ms 9740 KB Output is correct
10 Correct 4 ms 9676 KB Output is correct
11 Correct 5 ms 9676 KB Output is correct
12 Correct 5 ms 9676 KB Output is correct
13 Correct 5 ms 9676 KB Output is correct
14 Correct 4 ms 9676 KB Output is correct
15 Correct 4 ms 9624 KB Output is correct
16 Correct 4 ms 9676 KB Output is correct
17 Correct 4 ms 9676 KB Output is correct
18 Correct 6 ms 9676 KB Output is correct
19 Correct 5 ms 9960 KB Output is correct
20 Correct 5 ms 11724 KB Output is correct
21 Correct 5 ms 11724 KB Output is correct
22 Correct 170 ms 91844 KB Output is correct
23 Correct 43 ms 48716 KB Output is correct
24 Correct 40 ms 48808 KB Output is correct
25 Correct 31 ms 28236 KB Output is correct
26 Correct 57 ms 28248 KB Output is correct
27 Correct 293 ms 91912 KB Output is correct
28 Correct 18 ms 28268 KB Output is correct
29 Correct 30 ms 28264 KB Output is correct
30 Correct 21 ms 28236 KB Output is correct
31 Correct 27 ms 28248 KB Output is correct
32 Correct 10 ms 11728 KB Output is correct
33 Correct 5 ms 9676 KB Output is correct
34 Correct 13 ms 28236 KB Output is correct
35 Correct 12 ms 28236 KB Output is correct
36 Correct 2948 ms 108772 KB Output is correct
37 Correct 2995 ms 108704 KB Output is correct
38 Correct 2860 ms 108396 KB Output is correct
39 Correct 2746 ms 108272 KB Output is correct
40 Correct 2627 ms 108316 KB Output is correct
41 Correct 1122 ms 108156 KB Output is correct
42 Correct 2938 ms 108580 KB Output is correct
43 Correct 3230 ms 108396 KB Output is correct
44 Correct 3168 ms 108532 KB Output is correct
45 Correct 2972 ms 108276 KB Output is correct
46 Correct 2778 ms 108320 KB Output is correct
47 Correct 2662 ms 108096 KB Output is correct
48 Correct 2822 ms 108320 KB Output is correct
49 Correct 2785 ms 108348 KB Output is correct
50 Correct 6 ms 10060 KB Output is correct
51 Correct 6 ms 10060 KB Output is correct
52 Correct 9 ms 10060 KB Output is correct
53 Incorrect 5 ms 10088 KB Output isn't correct
54 Halted 0 ms 0 KB -