oj.uz

Submission #364063

# Submission time Handle Problem Language Result Execution time Memory
364063 2021-02-08T07:34:26 Z Lam_lai_cuoc_doi Olympic Bus (JOI20_ho_t4) C++17
100 / 100
 756 ms 3180 KB 
#include <iostream>
#include <cstdio>
#include <vector>
#include <bitset>
#include <algorithm>
#define task "busline"
using namespace std;
using ll = long long;
using ld = long double;

const int N = 2e2 + 5;
const int M = 5e4 + 5;
const ll Inf = 1e17;
struct Edge
{
    int u, v, c, d;
} e[M];
vector<int> adj[N], nadj[N];
int n, m;
int par[N];
ll d[7][N];
bool ok[N];
bitset<M> ck[7];
ll ans(Inf);

void Read()
{
    cin >> n >> m;
    for (int i = 1; i <= m; ++i)
    {
        cin >> e[i].u >> e[i].v >> e[i].c >> e[i].d;
        adj[e[i].u].push_back(i);
        nadj[e[i].v].push_back(i);
    }
}

void Dijkstra(int x, vector<int> adj[N], ll d[N], bitset<M> &ck, int except)
{
    for (int i = 0; i <= n; ++i)
    {
        d[i] = Inf;
        ok[i] = 0;
        par[i] = 0;
    }
    d[x] = 0;
    while (1)
    {
        int v(0);
        for (int i = 1; i <= n; ++i)
            if (!ok[i] && d[v] > d[i])
                v = i;
        if (v == 0)
            break;
        ok[v] = 1;
        for (auto i : adj[v])
            if (i != except && d[e[i].v ^ e[i].u ^ v] > d[v] + e[i].c)
            {
                d[e[i].v ^ e[i].u ^ v] = d[v] + e[i].c;
                par[e[i].v ^ e[i].u ^ v] = i;
            }
    }
    for (int i = 1; i <= n; ++i)
        if (i != x && d[i] != Inf)
            ck[par[i]] = 1;
}

ll Proc(int i, int x, int y, const vector<int> &s)
{
    int tmp1(s[0]), tmp2(s[3]);
    if (ck[s[0]][i])
    {
        Dijkstra(x, adj, d[5], ck[5], i);
        tmp1 = 5;
    }
    if (ck[s[3]][i])
    {
        Dijkstra(y, nadj, d[6], ck[6], i);
        tmp2 = 6;
    }
    if (d[tmp1][e[i].v] == Inf || d[tmp2][e[i].u] == Inf)
        return Inf;
    ll res = d[tmp1][e[i].v] + e[i].c + e[i].d + d[tmp2][e[i].u];
    tmp1 = s[2];
    tmp2 = s[1];
    if (ck[s[2]][i])
    {
        Dijkstra(y, adj, d[5], ck[5], i);
        tmp1 = 5;
    }
    if (ck[s[1]][i])
    {
        Dijkstra(x, nadj, d[6], ck[6], i);
        tmp2 = 6;
    }
    if ((d[tmp1][e[i].v] == Inf || d[tmp2][e[i].u] == Inf) && d[tmp1][x] == Inf)
        return Inf;
    res += min(d[tmp1][e[i].v] + e[i].c + d[tmp2][e[i].u], d[tmp1][x]);
    return res;
}

void Solve()
{
    Dijkstra(1, adj, d[1], ck[1], 0);
    Dijkstra(1, nadj, d[2], ck[2], 0);
    Dijkstra(n, adj, d[3], ck[3], 0);
    Dijkstra(n, nadj, d[4], ck[4], 0);
    if (d[1][n] != Inf && d[3][1] != Inf)
        ans = d[1][n] + d[3][1];
    for (int i = 1; i <= m; ++i)
    {
        ans = min(ans, Proc(i, 1, n, {1, 2, 3, 4}));
        ans = min(ans, Proc(i, n, 1, {3, 4, 1, 2}));
    }
    cout << (ans == Inf ? -1 : ans);
}

int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    if (fopen(task ".INP", "r"))
    {
        freopen(task ".INP", "r", stdin);
        freopen(task ".OUT", "w", stdout);
    }
    Read();
    Solve();
}

Compilation message

ho_t4.cpp: In function 'int32_t main()':
ho_t4.cpp:124:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  124 |         freopen(task ".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
ho_t4.cpp:125:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  125 |         freopen(task ".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 163 ms 620 KB Output is correct
2 Correct 4 ms 364 KB Output is correct
3 Correct 175 ms 520 KB Output is correct
4 Correct 177 ms 620 KB Output is correct
5 Correct 3 ms 492 KB Output is correct
6 Correct 9 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 182 ms 620 KB Output is correct
11 Correct 181 ms 492 KB Output is correct
12 Correct 183 ms 620 KB Output is correct
13 Correct 24 ms 492 KB Output is correct
14 Correct 71 ms 492 KB Output is correct
15 Correct 71 ms 516 KB Output is correct
16 Correct 71 ms 492 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 525 ms 3052 KB Output is correct
2 Correct 519 ms 2900 KB Output is correct
3 Correct 525 ms 3092 KB Output is correct
4 Correct 185 ms 492 KB Output is correct
5 Correct 146 ms 492 KB Output is correct
6 Correct 21 ms 364 KB Output is correct
7 Correct 2 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 82 ms 3180 KB Output is correct
10 Correct 80 ms 3052 KB Output is correct
11 Correct 210 ms 3180 KB Output is correct
12 Correct 239 ms 3052 KB Output is correct
13 Correct 213 ms 3020 KB Output is correct
14 Correct 216 ms 3052 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 165 ms 548 KB Output is correct
2 Correct 19 ms 364 KB Output is correct
3 Correct 421 ms 2284 KB Output is correct
4 Correct 10 ms 364 KB Output is correct
5 Correct 494 ms 2796 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 112 ms 2796 KB Output is correct
9 Correct 118 ms 2924 KB Output is correct
10 Correct 206 ms 2944 KB Output is correct
11 Correct 205 ms 2924 KB Output is correct
12 Correct 215 ms 2796 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 492 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 1 ms 364 KB Output is correct
18 Correct 1 ms 364 KB Output is correct
19 Correct 204 ms 2924 KB Output is correct
20 Correct 208 ms 2924 KB Output is correct
21 Correct 204 ms 2796 KB Output is correct
22 Correct 202 ms 2796 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 163 ms 620 KB Output is correct
2 Correct 4 ms 364 KB Output is correct
3 Correct 175 ms 520 KB Output is correct
4 Correct 177 ms 620 KB Output is correct
5 Correct 3 ms 492 KB Output is correct
6 Correct 9 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 182 ms 620 KB Output is correct
11 Correct 181 ms 492 KB Output is correct
12 Correct 183 ms 620 KB Output is correct
13 Correct 24 ms 492 KB Output is correct
14 Correct 71 ms 492 KB Output is correct
15 Correct 71 ms 516 KB Output is correct
16 Correct 71 ms 492 KB Output is correct
17 Correct 525 ms 3052 KB Output is correct
18 Correct 519 ms 2900 KB Output is correct
19 Correct 525 ms 3092 KB Output is correct
20 Correct 185 ms 492 KB Output is correct
21 Correct 146 ms 492 KB Output is correct
22 Correct 21 ms 364 KB Output is correct
23 Correct 2 ms 364 KB Output is correct
24 Correct 1 ms 364 KB Output is correct
25 Correct 82 ms 3180 KB Output is correct
26 Correct 80 ms 3052 KB Output is correct
27 Correct 210 ms 3180 KB Output is correct
28 Correct 239 ms 3052 KB Output is correct
29 Correct 213 ms 3020 KB Output is correct
30 Correct 216 ms 3052 KB Output is correct
31 Correct 165 ms 548 KB Output is correct
32 Correct 19 ms 364 KB Output is correct
33 Correct 421 ms 2284 KB Output is correct
34 Correct 10 ms 364 KB Output is correct
35 Correct 494 ms 2796 KB Output is correct
36 Correct 1 ms 364 KB Output is correct
37 Correct 1 ms 364 KB Output is correct
38 Correct 112 ms 2796 KB Output is correct
39 Correct 118 ms 2924 KB Output is correct
40 Correct 206 ms 2944 KB Output is correct
41 Correct 205 ms 2924 KB Output is correct
42 Correct 215 ms 2796 KB Output is correct
43 Correct 1 ms 364 KB Output is correct
44 Correct 1 ms 492 KB Output is correct
45 Correct 1 ms 364 KB Output is correct
46 Correct 1 ms 364 KB Output is correct
47 Correct 1 ms 364 KB Output is correct
48 Correct 1 ms 364 KB Output is correct
49 Correct 204 ms 2924 KB Output is correct
50 Correct 208 ms 2924 KB Output is correct
51 Correct 204 ms 2796 KB Output is correct
52 Correct 202 ms 2796 KB Output is correct
53 Correct 561 ms 2920 KB Output is correct
54 Correct 546 ms 2796 KB Output is correct
55 Correct 535 ms 2796 KB Output is correct
56 Correct 181 ms 492 KB Output is correct
57 Correct 176 ms 492 KB Output is correct
58 Correct 458 ms 2432 KB Output is correct
59 Correct 458 ms 2396 KB Output is correct
60 Correct 460 ms 2520 KB Output is correct
61 Correct 467 ms 2412 KB Output is correct
62 Correct 461 ms 2284 KB Output is correct
63 Correct 461 ms 2412 KB Output is correct
64 Correct 756 ms 2540 KB Output is correct
65 Correct 742 ms 2540 KB Output is correct
66 Correct 671 ms 2412 KB Output is correct
67 Correct 19 ms 2408 KB Output is correct
68 Correct 85 ms 3052 KB Output is correct
69 Correct 81 ms 3052 KB Output is correct
70 Correct 221 ms 3092 KB Output is correct
71 Correct 216 ms 3052 KB Output is correct
72 Correct 236 ms 3180 KB Output is correct
73 Correct 225 ms 3052 KB Output is correct
74 Correct 217 ms 3052 KB Output is correct