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답안 #530308

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
530308 2022-02-25T03:34:48 Z 4fecta Designated Cities (JOI19_designated_cities) C++17
23 / 100
 2000 ms 33884 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define int ll
#define ld long double
#define pii pair<int, int>
#define f first
#define s second
#define boost() cin.tie(0), cin.sync_with_stdio(0)

struct edge {
    int u, f, b;
};

const int MN = 200005;

int n, q, u, v, w, x, cost, ans[MN], dp[MN], node[MN], pre[MN], up[MN], vis[MN];
vector<edge> a[MN];

void dfs1(int cur, int par) {
    for (auto nxt : a[cur]) {
        if (nxt.u == par) continue;
        cost += nxt.f;
        dfs1(nxt.u, cur);
    }
}

void dfs2(int cur, int par) {
    ans[1] = min(ans[1], cost);
    for (auto nxt : a[cur]) {
        if (nxt.u == par) continue;
        cost += nxt.b - nxt.f;
        dfs2(nxt.u, cur);
        cost += nxt.f - nxt.b;
    }
}

void dfs3(int cur, int par) {
    node[cur] = cur;
    for (auto nxt : a[cur]) {
        if (nxt.u == par) continue;
        cost += nxt.b - nxt.f;
        dfs3(nxt.u, cur);
        cost += nxt.f - nxt.b;
        int val = dp[cur] + dp[nxt.u] + nxt.f;
        if (cost - val < ans[2]) {
            ans[2] = cost - val;
            u = node[cur], v = node[nxt.u];
        }
        if (dp[cur] < dp[nxt.u] + nxt.f) {
            dp[cur] = dp[nxt.u] + nxt.f;
            node[cur] = node[nxt.u];
        }
    }
}

void dfs4(int cur, int par) {
    pre[cur] = par;
    for (auto nxt : a[cur]) {
        if (nxt.u == par) continue;
        up[nxt.u] = nxt.f;
        dfs4(nxt.u, cur);
    }
}

void solve1() {
    dfs1(1, 0);
    dfs2(1, 0);
}

void solve_other() {
    dfs3(1, 0);
    dfs4(u, 0);
    while (v != u) vis[v] = 1, v = pre[v];
    vis[v] = 1;
    for (int i = 3; i <= n; i++) {
        ans[i] = ans[i - 1];
        int best = 0;
        for (int j = 1; j <= n; j++) {
            if (vis[j] || a[j].size() > 1) continue;
            int tmp = 0;
            u = j;
            while (!vis[u]) tmp += up[u], u = pre[u];
            if (tmp > best) best = tmp, v = j;
        }
        ans[i] -= best;
        while (!vis[v]) vis[v] = 1, v = pre[v];
    }
}

int32_t main() {
    boost();

    memset(ans, 0x3f, sizeof(ans));
    cin >> n;
    for (int i = 1; i < n; i++) {
        cin >> u >> v >> w >> x;
        a[u].push_back({v, w, x});
        a[v].push_back({u, x, w});
    }
    solve1();
    solve_other();
    cin >> q;
    while (q--) {
        cin >> x;
        printf("%lld\n", ans[x]);
    }

    return 0;
}

Subtask #1
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 6604 KB Output is correct
2 Correct 3 ms 6584 KB Output is correct
3 Correct 3 ms 6604 KB Output is correct
4 Correct 4 ms 6604 KB Output is correct
5 Correct 3 ms 6604 KB Output is correct
6 Correct 3 ms 6604 KB Output is correct
7 Correct 3 ms 6604 KB Output is correct
8 Correct 3 ms 6584 KB Output is correct
9 Correct 3 ms 6604 KB Output is correct
10 Correct 3 ms 6604 KB Output is correct
11 Correct 3 ms 6604 KB Output is correct

Subtask #2
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 6584 KB Output is correct
2 Execution timed out 2054 ms 33884 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #3
0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 6604 KB Output is correct
2 Execution timed out 2073 ms 33852 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #4
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 6604 KB Output is correct
2 Correct 3 ms 6584 KB Output is correct
3 Correct 3 ms 6604 KB Output is correct
4 Correct 4 ms 6604 KB Output is correct
5 Correct 3 ms 6604 KB Output is correct
6 Correct 3 ms 6604 KB Output is correct
7 Correct 3 ms 6604 KB Output is correct
8 Correct 3 ms 6584 KB Output is correct
9 Correct 3 ms 6604 KB Output is correct
10 Correct 3 ms 6604 KB Output is correct
11 Correct 3 ms 6604 KB Output is correct
12 Correct 3 ms 6604 KB Output is correct
13 Correct 10 ms 6860 KB Output is correct
14 Correct 6 ms 6988 KB Output is correct
15 Correct 18 ms 6780 KB Output is correct
16 Correct 10 ms 6860 KB Output is correct
17 Correct 10 ms 6852 KB Output is correct
18 Correct 10 ms 6860 KB Output is correct
19 Correct 11 ms 6852 KB Output is correct
20 Correct 10 ms 6880 KB Output is correct
21 Correct 9 ms 6852 KB Output is correct
22 Correct 9 ms 6900 KB Output is correct
23 Correct 25 ms 6848 KB Output is correct
24 Correct 13 ms 6796 KB Output is correct
25 Correct 6 ms 6988 KB Output is correct
26 Correct 13 ms 6860 KB Output is correct

Subtask #5
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 6584 KB Output is correct
2 Execution timed out 2054 ms 33884 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #6
0 / 44.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 6604 KB Output is correct
2 Correct 3 ms 6584 KB Output is correct
3 Correct 3 ms 6604 KB Output is correct
4 Correct 4 ms 6604 KB Output is correct
5 Correct 3 ms 6604 KB Output is correct
6 Correct 3 ms 6604 KB Output is correct
7 Correct 3 ms 6604 KB Output is correct
8 Correct 3 ms 6584 KB Output is correct
9 Correct 3 ms 6604 KB Output is correct
10 Correct 3 ms 6604 KB Output is correct
11 Correct 3 ms 6604 KB Output is correct
12 Correct 3 ms 6584 KB Output is correct
13 Execution timed out 2054 ms 33884 KB Time limit exceeded
14 Halted 0 ms 0 KB -