oj.uz

Submission #203157

# Submission time Handle Problem Language Result Execution time Memory
203157 2020-02-19T15:14:57 Z godwind Olympic Bus (JOI20_ho_t4) C++17
37 / 100
 1000 ms 2352 KB 
// O O O O O O O O O O O O O O O OO O OO O OO O O O TTCH O TTTCH O TTTCH O O O O
#pragma GCC optimize("Ofast")
#pragma GCC optimize("no-stack-protector")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("fast-math")
#pragma GCC target("sse,sse2,sse3,ssse3,popcnt,abm,mmx")
#include <iostream>
#include <vector>
#include <algorithm>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <stdio.h>
#include <cstdio>
#include <math.h>
#include <cmath>
#include <string>
#include <cstring>
#include <queue>
#include <deque>
// #include <random>
#include <iomanip>
#include <bitset>
#include <cassert>
 
using namespace std;


#define y1 y11
#define double long double
#define less less228
#define left left228
#define right right228
#define list list228
 
 
 
template<typename T> void uin(T &a, T b) {
    if (b < a) a = b;
}
template<typename T> void uax(T &a, T b) {
    if (b > a) a = b;
}
 
 
// random_device rnd;
 
// template<typename T> void shuffle(vector< T > &v) {
//     for (int i = 1; i < (int)v.size(); ++i) {
//         swap(v[rnd() % i], v[i]);
//     }
//     for (int i = (int)v.size() - 1; i; --i) {
//         swap(v[rnd() % i], v[i]);
//     }
// }

const int N = 228;
const int M = 50 * 1000 + 228;
const int INF = 1e9 + 228;

struct Edge
{
    int u, v, c, d;
    Edge() {}
    Edge(int _u, int _v, int _c, int _d) {u = _u, v = _v, c = _c, d = _d;}
};

int n, m;
int U[M], V[M], C[M], D[M];
bool taken[M];
int from1[N], fromn[N], to1[N], ton[N];
int d[N], pr[N];
vector<int> g[N];
priority_queue< pair<int, int> > q;

int kekos(int s, int t) {
    for (int i = 1; i <= n; ++i) {
        d[i] = INF;
        pr[i] = -1;
    }
    d[s] = 0;
    q.push({0, s});
    while (!q.empty()) {
        pair<int, int> P = q.top();
        q.pop();
        int v = P.second;
        for (int i : g[v]) {
            if (d[v] + C[i] < d[V[i]]) {
                d[V[i]] = d[v] + C[i];
                pr[V[i]] = i;
                q.push({-d[V[i]], V[i]});
            }
        }
    }
    int x = d[t];
    if (x == INF) return x;
    while (t != s) {
        taken[pr[t]] = 1;
        t = U[pr[t]];
    }
    return x;
}

int dij(int s, int t) {
    for (int i = 1; i <= n; ++i) {
        d[i] = INF;
    }
    d[s] = 0;
    q.push({0, s});
    while (!q.empty()) {
        pair<int, int> P = q.top();
        q.pop();
        int v = P.second;
        for (int i : g[v]) {
            if (d[v] + C[i] < d[V[i]]) {
                d[V[i]] = d[v] + C[i];
                q.push({-d[V[i]], V[i]});
            }
        }
    }
    return d[t];
}

void reset() {
    for (int i = 1; i <= n; ++i) {
        g[i].clear();
    }
    for (int i = 0; i < m; ++i) {
        g[U[i]].push_back(i);
    }
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin >> n >> m;
    vector< Edge > edges;
    for (int i = 0; i < m; ++i) {
        cin >> U[i] >> V[i] >> C[i] >> D[i];
        edges.emplace_back(U[i], V[i], C[i], D[i]);
        g[U[i]].emplace_back(i);
    }
    int path1 = kekos(1, n);
    int path2 = kekos(n, 1);
    int answer = 2 * INF;
    if (path1 != INF && path2 != INF) {
        uin(answer, path1 + path2);
    }
    dij(1, 0);
    for (int i = 1; i <= n; ++i) {
        from1[i] = d[i];
    }
    dij(n, 0);
    for (int i = 1; i <= n; ++i) {
        fromn[i] = d[i];
    }
    for (int i = 0; i < m; ++i) {
        swap(U[i], V[i]);
    }
    reset();
    dij(1, 0);
    for (int i = 1; i <= n; ++i) {
        to1[i] = d[i];
    }
    dij(n, 0);
    for (int i = 1; i <= n; ++i) {
        ton[i] = d[i];
    }
    for (int i = 0; i < m; ++i) {
        swap(U[i], V[i]);
    }
    reset();
    for (int E = 0; E < m; ++E) {
        if (!taken[E]) {
            int npath1 = min(path1, from1[V[E]] + ton[U[E]] + C[E]);
            int npath2 = min(path2, fromn[V[E]] + to1[U[E]] + C[E]);
            if (npath1 < INF && npath2 < INF) {
                uin(answer, D[E] + npath1 + npath2);
            }
        } else {
            swap(U[E], V[E]);
            reset();
            int go1 = dij(1, n);
            if (go1 < INF) {
                int go2 = dij(n, 1);
                if (go2 < INF) {
                    uin(answer, D[E] + go1 + go2);
                }
            }
            swap(U[E], V[E]);
        }
    }
    if (answer > 2 * INF - 1000000) answer = -1;
    cout << answer << '\n';
    return 0;
}
// RU_023
 
/*
4 5
1 2 4 4
1 3 2 1
4 3 1 2
4 1 6 1
2 4 2 5
---
10


4 10
1 2 4 4
1 2 4 4
1 3 2 1
1 3 2 1
4 3 1 2
4 3 1 2
4 1 6 1
4 1 6 1
2 4 2 5
2 4 2 5
---
10

4 4
1 2 0 4
1 3 0 1
4 3 0 2
4 1 0 1
---
2



4 5
1 2 4 4
1 3 2 4
4 3 1 5
4 1 6 1
2 4 2 5
---
12


4 5
2 1 4 4
1 3 2 1
4 3 1 2
4 3 6 1
2 4 2 5
---
-1

*/

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 376 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 6 ms 376 KB Output is correct
4 Correct 7 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 27 ms 424 KB Output is correct
11 Correct 33 ms 376 KB Output is correct
12 Correct 32 ms 376 KB Output is correct
13 Correct 5 ms 376 KB Output is correct
14 Correct 6 ms 380 KB Output is correct
15 Correct 5 ms 376 KB Output is correct
16 Correct 6 ms 376 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 2348 KB Output is correct
2 Correct 43 ms 2352 KB Output is correct
3 Correct 45 ms 2352 KB Output is correct
4 Correct 6 ms 504 KB Output is correct
5 Correct 6 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 32 ms 2344 KB Output is correct
10 Correct 31 ms 2340 KB Output is correct
11 Correct 39 ms 2348 KB Output is correct
12 Correct 41 ms 2348 KB Output is correct
13 Correct 36 ms 2348 KB Output is correct
14 Correct 36 ms 2348 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 376 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 25 ms 2096 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 31 ms 2348 KB Output is correct
6 Correct 5 ms 504 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 27 ms 2340 KB Output is correct
9 Correct 28 ms 2340 KB Output is correct
10 Correct 28 ms 2344 KB Output is correct
11 Correct 27 ms 2348 KB Output is correct
12 Correct 28 ms 2352 KB Output is correct
13 Correct 5 ms 376 KB Output is correct
14 Correct 5 ms 376 KB Output is correct
15 Correct 5 ms 352 KB Output is correct
16 Correct 5 ms 376 KB Output is correct
17 Correct 5 ms 376 KB Output is correct
18 Correct 5 ms 376 KB Output is correct
19 Correct 29 ms 2344 KB Output is correct
20 Correct 29 ms 2344 KB Output is correct
21 Correct 27 ms 2348 KB Output is correct
22 Correct 31 ms 2348 KB Output is correct

Subtask #4
0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 376 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 6 ms 376 KB Output is correct
4 Correct 7 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 27 ms 424 KB Output is correct
11 Correct 33 ms 376 KB Output is correct
12 Correct 32 ms 376 KB Output is correct
13 Correct 5 ms 376 KB Output is correct
14 Correct 6 ms 380 KB Output is correct
15 Correct 5 ms 376 KB Output is correct
16 Correct 6 ms 376 KB Output is correct
17 Correct 43 ms 2348 KB Output is correct
18 Correct 43 ms 2352 KB Output is correct
19 Correct 45 ms 2352 KB Output is correct
20 Correct 6 ms 504 KB Output is correct
21 Correct 6 ms 376 KB Output is correct
22 Correct 5 ms 376 KB Output is correct
23 Correct 5 ms 376 KB Output is correct
24 Correct 5 ms 376 KB Output is correct
25 Correct 32 ms 2344 KB Output is correct
26 Correct 31 ms 2340 KB Output is correct
27 Correct 39 ms 2348 KB Output is correct
28 Correct 41 ms 2348 KB Output is correct
29 Correct 36 ms 2348 KB Output is correct
30 Correct 36 ms 2348 KB Output is correct
31 Correct 6 ms 376 KB Output is correct
32 Correct 5 ms 376 KB Output is correct
33 Correct 25 ms 2096 KB Output is correct
34 Correct 5 ms 376 KB Output is correct
35 Correct 31 ms 2348 KB Output is correct
36 Correct 5 ms 504 KB Output is correct
37 Correct 5 ms 376 KB Output is correct
38 Correct 27 ms 2340 KB Output is correct
39 Correct 28 ms 2340 KB Output is correct
40 Correct 28 ms 2344 KB Output is correct
41 Correct 27 ms 2348 KB Output is correct
42 Correct 28 ms 2352 KB Output is correct
43 Correct 5 ms 376 KB Output is correct
44 Correct 5 ms 376 KB Output is correct
45 Correct 5 ms 352 KB Output is correct
46 Correct 5 ms 376 KB Output is correct
47 Correct 5 ms 376 KB Output is correct
48 Correct 5 ms 376 KB Output is correct
49 Correct 29 ms 2344 KB Output is correct
50 Correct 29 ms 2344 KB Output is correct
51 Correct 27 ms 2348 KB Output is correct
52 Correct 31 ms 2348 KB Output is correct
53 Correct 44 ms 2352 KB Output is correct
54 Correct 51 ms 2348 KB Output is correct
55 Correct 48 ms 2352 KB Output is correct
56 Correct 6 ms 376 KB Output is correct
57 Correct 6 ms 376 KB Output is correct
58 Correct 268 ms 2096 KB Output is correct
59 Correct 331 ms 2100 KB Output is correct
60 Correct 468 ms 2224 KB Output is correct
61 Correct 251 ms 2104 KB Output is correct
62 Correct 305 ms 2100 KB Output is correct
63 Correct 447 ms 2096 KB Output is correct
64 Execution timed out 1097 ms 2096 KB Time limit exceeded
65 Halted 0 ms 0 KB -