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답안 #525822

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
525822 2022-02-13T00:41:44 Z mjhmjh1104 Mountains and Valleys (CCO20_day1problem3) C++17
2 / 25
 3353 ms 108656 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 = -(int)1e9;
        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: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
0.0 / 1.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 9676 KB Output is correct
2 Correct 5 ms 9608 KB Output is correct
3 Correct 5 ms 9676 KB Output is correct
4 Correct 5 ms 9676 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 9720 KB Output is correct
8 Correct 5 ms 9608 KB Output is correct
9 Correct 5 ms 9672 KB Output is correct
10 Correct 6 ms 9676 KB Output is correct
11 Incorrect 5 ms 9676 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #2
0.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 9676 KB Output is correct
2 Correct 5 ms 9608 KB Output is correct
3 Correct 5 ms 9676 KB Output is correct
4 Correct 5 ms 9676 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 9720 KB Output is correct
8 Correct 5 ms 9608 KB Output is correct
9 Correct 5 ms 9672 KB Output is correct
10 Correct 6 ms 9676 KB Output is correct
11 Incorrect 5 ms 9676 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #3
2.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3046 ms 108584 KB Output is correct
2 Correct 3099 ms 108612 KB Output is correct
3 Correct 2956 ms 108528 KB Output is correct
4 Correct 2934 ms 108272 KB Output is correct
5 Correct 2752 ms 108252 KB Output is correct
6 Correct 1152 ms 108164 KB Output is correct
7 Correct 3139 ms 108580 KB Output is correct
8 Correct 3353 ms 108296 KB Output is correct
9 Correct 3062 ms 108656 KB Output is correct
10 Correct 2830 ms 108228 KB Output is correct
11 Correct 2979 ms 108420 KB Output is correct
12 Correct 2771 ms 108036 KB Output is correct
13 Correct 2832 ms 108356 KB Output is correct
14 Correct 2902 ms 108316 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 9608 KB Output is correct
3 Correct 5 ms 9676 KB Output is correct
4 Correct 5 ms 9676 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 9720 KB Output is correct
8 Correct 5 ms 9608 KB Output is correct
9 Correct 5 ms 9672 KB Output is correct
10 Correct 6 ms 9676 KB Output is correct
11 Incorrect 5 ms 9676 KB Output isn't correct
12 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 9608 KB Output is correct
3 Correct 5 ms 9676 KB Output is correct
4 Correct 5 ms 9676 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 9720 KB Output is correct
8 Correct 5 ms 9608 KB Output is correct
9 Correct 5 ms 9672 KB Output is correct
10 Correct 6 ms 9676 KB Output is correct
11 Incorrect 5 ms 9676 KB Output isn't correct
12 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 9608 KB Output is correct
3 Correct 5 ms 9676 KB Output is correct
4 Correct 5 ms 9676 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 9720 KB Output is correct
8 Correct 5 ms 9608 KB Output is correct
9 Correct 5 ms 9672 KB Output is correct
10 Correct 6 ms 9676 KB Output is correct
11 Incorrect 5 ms 9676 KB Output isn't correct
12 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 9608 KB Output is correct
3 Correct 5 ms 9676 KB Output is correct
4 Correct 5 ms 9676 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 9720 KB Output is correct
8 Correct 5 ms 9608 KB Output is correct
9 Correct 5 ms 9672 KB Output is correct
10 Correct 6 ms 9676 KB Output is correct
11 Incorrect 5 ms 9676 KB Output isn't correct
12 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 9608 KB Output is correct
3 Correct 5 ms 9676 KB Output is correct
4 Correct 5 ms 9676 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 9720 KB Output is correct
8 Correct 5 ms 9608 KB Output is correct
9 Correct 5 ms 9672 KB Output is correct
10 Correct 6 ms 9676 KB Output is correct
11 Incorrect 5 ms 9676 KB Output isn't correct
12 Halted 0 ms 0 KB -