QOJ.ac

QOJ

ID题目提交者结果用时内存语言文件大小提交时间测评时间
#765267#6306. Chase GameFangYifanWA 0ms3848kbC++202.2kb2024-11-20 13:29:342024-11-20 13:29:34

Judging History

你现在查看的是最新测评结果

  • [2024-11-20 13:29:34]
  • 评测
  • 测评结果:WA
  • 用时:0ms
  • 内存:3848kb
  • [2024-11-20 13:29:34]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using db = double;
constexpr int mod = 998244353;
constexpr int N = 1e6 + 10;

void solve() {
    int n, m, k, d;
    cin >> n >> m >> k >> d;
    vector<vector<int>> edge(n + 1);
    for (int i = 1; i <= m; i++) {
        int u, v;
        cin >> u >> v;
        edge[u].push_back(v);
        edge[v].push_back(u);
    }
    auto calc = [&](ll len) -> ll {
        ll sum1 = (len / d) * d * (d + 1) / 2;
        ll sum2 = (len % d) * (d + d - len % d + 1) / 2;
        return sum1 + sum2;
    };
    auto bfs = [&](int s) -> vector<int> {
        vector<int> dis(n + 1, 1e9);
        queue<int> q;
        dis[s] = 0;
        q.push(s);
        while (!q.empty()) {
            int u = q.front(); q.pop();
            for (auto v : edge[u]) {
                if (dis[v] > dis[u] + 1) {
                    dis[v] = dis[u] + 1;
                    q.push(v);
                }
            }
        }
        return dis;
    };
    ll ans = 1e18;
    vector<int> disn = bfs(n);
    vector<int> disk = bfs(k);
    vector<ll> dis(n + 1, 1e18), vis(n + 1);
    priority_queue<pair<ll, int>> q;
    for (auto x : edge[1]) {
        if (disk[x] >= d) {
            ans = min(ans, calc(disn[x] + 1));
            // cerr << x << ' ' << disn[x] << ' ' << calc(disn[x]) << "\n";
        } else {
            dis[x] = d - disk[x];
            q.push({-dis[x], x});
        }
    }
    while (!q.empty()) {
        auto [d, u] = q.top(); q.pop();
        if (vis[u]) continue;
        vis[u] = true;
        for (auto v : edge[u]) {
            if (disk[v] >= d) {
                ans = min(ans, dis[u] + calc(disn[v] + 1));
                // cerr << u << ' ' << v << ' ' << dis[u] << ' ' << calc(disn[v]) << "\n";
            } else if (dis[v] > dis[u] + d - disk[v]) {
                dis[v] = dis[u] + d - disk[v];
                q.push({-dis[v], v});
            }
        }
    }
    cout << min(ans, dis[n]) << "\n";
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int tt = 1;
    // cin >> tt;
    while (tt--) {
        solve();
    }
    return 0;
}

詳細信息

Test #1:

score: 100
Accepted
time: 0ms
memory: 3560kb

input:

5 5 3 1
1 2
2 4
4 5
1 3
3 5

output:

2

result:

ok 1 number(s): "2"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3784kb

input:

13 17 12 3
1 2
2 3
3 4
4 13
5 13
7 8
7 9
7 10
7 11
7 6
12 7
1 8
8 9
9 10
10 11
11 6
6 13

output:

7

result:

ok 1 number(s): "7"

Test #3:

score: 0
Accepted
time: 0ms
memory: 3816kb

input:

10 9 4 1
4 3
1 2
7 6
6 5
8 9
9 10
5 4
8 7
3 2

output:

9

result:

ok 1 number(s): "9"

Test #4:

score: 0
Accepted
time: 0ms
memory: 3848kb

input:

10 20 9 1
9 5
2 9
4 5
10 5
7 3
1 8
7 1
7 5
3 4
3 1
7 8
3 8
9 3
10 6
9 1
1 6
8 5
6 2
1 10
2 1

output:

1

result:

ok 1 number(s): "1"

Test #5:

score: 0
Accepted
time: 0ms
memory: 3564kb

input:

10 20 3 1
1 4
6 7
5 4
5 3
2 1
8 1
7 8
2 6
2 4
4 8
9 5
1 10
7 4
5 8
4 10
2 5
6 10
4 6
3 7
1 3

output:

1

result:

ok 1 number(s): "1"

Test #6:

score: 0
Accepted
time: 0ms
memory: 3616kb

input:

10 20 4 1
2 7
6 4
2 3
2 4
6 5
8 5
6 7
10 2
3 10
1 8
3 9
3 7
1 7
5 1
6 1
3 4
2 1
5 2
9 2
9 10

output:

2

result:

ok 1 number(s): "2"

Test #7:

score: -100
Wrong Answer
time: 0ms
memory: 3600kb

input:

10 20 1 10
10 9
2 5
7 8
7 10
10 8
8 9
5 6
3 1
6 4
7 9
2 3
3 6
2 1
8 6
5 8
7 4
4 3
2 4
4 1
9 6

output:

28

result:

wrong answer 1st numbers differ - expected: '24', found: '28'