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Submission #540998

# Submission time Handle Problem Language Result Execution time Memory
540998 2022-03-22T06:01:54 Z LittleCube Olympic Bus (JOI20_ho_t4) C++14
100 / 100
 719 ms 3804 KB 
#include <bits/stdc++.h>
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define F first
#define S second
using namespace std;

ll N, M, w[50005], d[50005], ans = 1e18;
pll edge[50005];
bool recalcto[50005], recalcback[50005];
vector<ll> to, torev, back, backrev, recalctodis, recalcbackdis;
vector<int> tofrom, backfrom, tmp;
vector<int> E[205], rE[205];

pll get_edge(int id, int u)
{
    if (edge[id].F == u)
        return pll{edge[id].S, w[id]};
    else
        return pll{edge[id].F, w[id]};
}

void dijkstra(int begin, int N, vector<ll> &dis, vector<int> &from, vector<int> E[])
{
    dis = vector<ll>(N + 1, 1e18);
    dis[begin] = 0;
    from.resize(N + 1);
    priority_queue<pll, vector<pll>, greater<pll>> pq;
    pq.push({0, begin});
    while (!pq.empty())
    {
        auto [d, u] = pq.top();
        pq.pop();
        if (d > dis[u])
            continue;
        for (auto id : E[u])
        {
            auto [v, w] = get_edge(id, u);
            if (dis[v] > dis[u] + w)
            {
                dis[v] = dis[u] + w;
                pq.push({dis[v], v});
                from[v] = id;
            }
        }
    }
}

signed main()
{
    cin >> N >> M;
    for (int i = 1; i <= M; i++)
    {
        ll U, V, C, D;
        cin >> U >> V >> C >> D;
        edge[i] = {U, V};
        w[i] = C;
        d[i] = D;
        E[U].emplace_back(i);
        rE[V].emplace_back(i);
    }
    dijkstra(N, N, torev, tmp, rE);
    dijkstra(1, N, to, tofrom, E);
    dijkstra(1, N, backrev, tmp, rE);
    dijkstra(N, N, back, backfrom, E);
    //for (int i = 1; i <= N; i++)
    //    cout << to[i] << " \n"[i == N];
    //for (int i = 1; i <= N; i++)
    //    cout << back[i] << " \n"[i == N];
    if (to[N] < 1e18)
    {
        int cur = N;
        while (cur != 1)
        {
            int id = tofrom[cur];
            recalcto[id] = 1;
            cur = get_edge(id, cur).F;
        }
    }
    if (back[1] < 1e18)
    {
        int cur = 1;
        while (cur != N)
        {
            int id = backfrom[cur];
            recalcback[id] = 1;
            cur = get_edge(id, cur).F;
        }
    }
    ans = to[N] + back[1];
    //cerr << ans << '\n';
    for (int i = 1; i <= M; i++)
    {
        //cerr << i << " = ";
        ll res = d[i];
        if (recalcto[i])
        {
            //cout << " recalcto ";
            tie(edge[M + 1], w[M + 1]) = tie(edge[i], w[i]);
            w[i] = 1e18;
            E[edge[M + 1].S].emplace_back(M + 1);

            dijkstra(1, N, recalctodis, tmp, E);

            E[edge[M + 1].S].pop_back();
            tie(edge[i], w[i]) = tie(edge[M + 1], w[M + 1]);

            res += recalctodis[N];
        }
        else
            res += min(to[N], to[edge[i].S] + w[i] + torev[edge[i].F]);
        //cerr << res << " ";
        if (recalcback[i])
        {
            //cout << " recalcback ";
            tie(edge[M + 1], w[M + 1]) = tie(edge[i], w[i]);
            w[i] = 1e18;
            E[edge[M + 1].S].emplace_back(M + 1);

            dijkstra(N, N, recalcbackdis, tmp, E);

            E[edge[M + 1].S].pop_back();
            tie(edge[i], w[i]) = tie(edge[M + 1], w[M + 1]);

            res += recalcbackdis[1];
        }
        else
            res += min(back[1], back[edge[i].S] + w[i] + backrev[edge[i].F]);
        //cerr << res << "\n";
        ans = min(ans, res);
    }
    cout << (ans >= 1e18 ? -1 : ans) << '\n';
}

Compilation message

ho_t4.cpp: In function 'void dijkstra(int, int, std::vector<long long int>&, std::vector<int>&, std::vector<int>*)':
ho_t4.cpp:33:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   33 |         auto [d, u] = pq.top();
      |              ^
ho_t4.cpp:39:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   39 |             auto [v, w] = get_edge(id, u);
      |                  ^

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 2 ms 340 KB Output is correct
4 Correct 2 ms 380 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 312 KB Output is correct
8 Correct 1 ms 316 KB Output is correct
9 Correct 2 ms 340 KB Output is correct
10 Correct 18 ms 428 KB Output is correct
11 Correct 16 ms 432 KB Output is correct
12 Correct 16 ms 468 KB Output is correct
13 Correct 2 ms 340 KB Output is correct
14 Correct 2 ms 340 KB Output is correct
15 Correct 2 ms 340 KB Output is correct
16 Correct 3 ms 376 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 3504 KB Output is correct
2 Correct 54 ms 3528 KB Output is correct
3 Correct 60 ms 3688 KB Output is correct
4 Correct 3 ms 468 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 1 ms 324 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 316 KB Output is correct
9 Correct 53 ms 3688 KB Output is correct
10 Correct 54 ms 3668 KB Output is correct
11 Correct 58 ms 3748 KB Output is correct
12 Correct 59 ms 3680 KB Output is correct
13 Correct 55 ms 3720 KB Output is correct
14 Correct 55 ms 3804 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 340 KB Output is correct
2 Correct 1 ms 316 KB Output is correct
3 Correct 40 ms 2752 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 49 ms 3488 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 46 ms 3372 KB Output is correct
9 Correct 46 ms 3484 KB Output is correct
10 Correct 51 ms 3436 KB Output is correct
11 Correct 51 ms 3404 KB Output is correct
12 Correct 47 ms 3464 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 46 ms 3448 KB Output is correct
20 Correct 53 ms 3392 KB Output is correct
21 Correct 59 ms 3372 KB Output is correct
22 Correct 47 ms 3404 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 2 ms 340 KB Output is correct
4 Correct 2 ms 380 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 312 KB Output is correct
8 Correct 1 ms 316 KB Output is correct
9 Correct 2 ms 340 KB Output is correct
10 Correct 18 ms 428 KB Output is correct
11 Correct 16 ms 432 KB Output is correct
12 Correct 16 ms 468 KB Output is correct
13 Correct 2 ms 340 KB Output is correct
14 Correct 2 ms 340 KB Output is correct
15 Correct 2 ms 340 KB Output is correct
16 Correct 3 ms 376 KB Output is correct
17 Correct 52 ms 3504 KB Output is correct
18 Correct 54 ms 3528 KB Output is correct
19 Correct 60 ms 3688 KB Output is correct
20 Correct 3 ms 468 KB Output is correct
21 Correct 2 ms 340 KB Output is correct
22 Correct 1 ms 324 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 0 ms 316 KB Output is correct
25 Correct 53 ms 3688 KB Output is correct
26 Correct 54 ms 3668 KB Output is correct
27 Correct 58 ms 3748 KB Output is correct
28 Correct 59 ms 3680 KB Output is correct
29 Correct 55 ms 3720 KB Output is correct
30 Correct 55 ms 3804 KB Output is correct
31 Correct 3 ms 340 KB Output is correct
32 Correct 1 ms 316 KB Output is correct
33 Correct 40 ms 2752 KB Output is correct
34 Correct 1 ms 340 KB Output is correct
35 Correct 49 ms 3488 KB Output is correct
36 Correct 1 ms 340 KB Output is correct
37 Correct 1 ms 340 KB Output is correct
38 Correct 46 ms 3372 KB Output is correct
39 Correct 46 ms 3484 KB Output is correct
40 Correct 51 ms 3436 KB Output is correct
41 Correct 51 ms 3404 KB Output is correct
42 Correct 47 ms 3464 KB Output is correct
43 Correct 1 ms 340 KB Output is correct
44 Correct 1 ms 212 KB Output is correct
45 Correct 0 ms 340 KB Output is correct
46 Correct 0 ms 212 KB Output is correct
47 Correct 1 ms 340 KB Output is correct
48 Correct 1 ms 340 KB Output is correct
49 Correct 46 ms 3448 KB Output is correct
50 Correct 53 ms 3392 KB Output is correct
51 Correct 59 ms 3372 KB Output is correct
52 Correct 47 ms 3404 KB Output is correct
53 Correct 56 ms 3596 KB Output is correct
54 Correct 68 ms 3544 KB Output is correct
55 Correct 51 ms 3544 KB Output is correct
56 Correct 2 ms 340 KB Output is correct
57 Correct 2 ms 380 KB Output is correct
58 Correct 131 ms 2864 KB Output is correct
59 Correct 137 ms 3080 KB Output is correct
60 Correct 143 ms 2964 KB Output is correct
61 Correct 109 ms 2976 KB Output is correct
62 Correct 134 ms 2936 KB Output is correct
63 Correct 145 ms 2872 KB Output is correct
64 Correct 719 ms 3564 KB Output is correct
65 Correct 662 ms 3568 KB Output is correct
66 Correct 618 ms 3676 KB Output is correct
67 Correct 41 ms 2888 KB Output is correct
68 Correct 63 ms 3656 KB Output is correct
69 Correct 55 ms 3616 KB Output is correct
70 Correct 57 ms 3708 KB Output is correct
71 Correct 67 ms 3712 KB Output is correct
72 Correct 57 ms 3644 KB Output is correct
73 Correct 56 ms 3696 KB Output is correct
74 Correct 56 ms 3660 KB Output is correct