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답안 #400144

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
400144 2021-05-07T13:04:27 Z SavicS Olympic Bus (JOI20_ho_t4) C++14
37 / 100
 1000 ms 1868 KB 
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <bits/stdc++.h>

#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define ff(i,a,b) for(int i=a;i<=b;i++)
#define fb(i,b,a) for(int i=b;i>=a;i--)

using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef pair<int,int> pii;
const int maxn = 100005;
const ll inf = 1e18 + 5;

template<typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

// os.order_of_key(k) the number of elements in the os less than k
// *os.find_by_order(k)  print the k-th smallest number in os(0-based)

int n, m;
array<int,4> niz[maxn];

bool used[maxn];

const int N = 205;
vector<int> g[N];
vector<int> rg[N];

ll dist[2][N]; // 0 - 1, 1 - n
int from[2][N]; // 0 - 1, 1 - n
void dij1(int s, ll dist[], int from[]){
    ff(i,1,n)dist[i] = inf;
    priority_queue<pii, vector<pii>, greater<pii>> pq;

    pq.push({dist[s] = 0, s});
    while(!pq.empty()){
        pii v = pq.top(); pq.pop();
        if(dist[v.se] < v.fi)continue;
        for(int c : g[v.se]){
            int u = niz[c][1];
            int w = niz[c][2];
            if(v.se != niz[c][0])continue;
            if(dist[u] > w + v.fi){
                pq.push({dist[u] = w + v.fi, u});
                from[u] = c;
            }
        }
    }

}

ll rdist[2][N]; // 0 - 1, 1 - n
void dij2(int s, ll dist[]){
    ff(i,1,n)dist[i] = inf;
    priority_queue<pii, vector<pii>, greater<pii>> pq;

    pq.push({dist[s] = 0, s});
    while(!pq.empty()){
        pii v = pq.top(); pq.pop();
        if(dist[v.se] < v.fi)continue;
        for(int c : rg[v.se]){
            int u = niz[c][0];
            int w = niz[c][2];
            if(dist[u] > w + v.fi){
                pq.push({dist[u] = w + v.fi, u});
            }
        }
    }

}

int main()
{
    ios::sync_with_stdio(false);
    cout.tie(nullptr);
    cin.tie(nullptr);
    cin >> n >> m;
    ff(i,1,m){
        int u, v, c, d;
        cin >> u >> v >> c >> d;
        g[u].pb(i);
        rg[v].pb(i);
        niz[i] = {u, v, c, d};
    }

    dij1(1, dist[0], from[0]), dij1(n, dist[1], from[1]);
    dij2(1, rdist[0]), dij2(n, rdist[1]);

    int cur = n;
    while(from[0][cur] && cur != 1){
        used[from[0][cur]] = 1;
        cur = niz[from[0][cur]][0];
    }

    cur = 1;
    while(from[1][cur] && cur != n){
        used[from[1][cur]] = 1;
        cur = niz[from[1][cur]][0];
    }

    ll rez = inf;
    rez = min(rez, dist[0][n] + dist[1][1]);
    ff(i,1,m){
        int u = niz[i][0];
        int v = niz[i][1];
        int c = niz[i][2];
        int d = niz[i][3];
        if(!used[i]){

            ll A = min(dist[0][n], dist[0][v] + c + rdist[1][u]);
            ll B = min(dist[1][1], dist[1][v] + c + rdist[0][u]);

            rez = min(rez, A + B + d);

        }

    }

    ff(i,1,m){
        int u = niz[i][0];
        int v = niz[i][1];
        int c = niz[i][2];
        int d = niz[i][3];
        if(used[i]){
            swap(niz[i][0], niz[i][1]);
            g[v].pb(i);
            dij1(1, dist[0], from[0]), dij1(n, dist[1], from[1]);
            g[v].pop_back();
            swap(niz[i][0], niz[i][1]);

            rez = min(rez, dist[0][n] + d + dist[1][1]);

        }
    }

    cout << (rez == inf ? -1 : rez);

    return 0;
}
/**

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


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

// probati bojenje sahovski ili slicno

**/

Compilation message

ho_t4.cpp: In function 'int main()':
ho_t4.cpp:127:13: warning: unused variable 'u' [-Wunused-variable]
  127 |         int u = niz[i][0];
      |             ^
ho_t4.cpp:129:13: warning: unused variable 'c' [-Wunused-variable]
  129 |         int c = niz[i][2];
      |             ^

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 2 ms 332 KB Output is correct
4 Correct 2 ms 332 KB Output is correct
5 Correct 2 ms 336 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 20 ms 388 KB Output is correct
11 Correct 25 ms 332 KB Output is correct
12 Correct 24 ms 332 KB Output is correct
13 Correct 2 ms 332 KB Output is correct
14 Correct 2 ms 332 KB Output is correct
15 Correct 2 ms 332 KB Output is correct
16 Correct 2 ms 332 KB Output is correct

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 26 ms 1728 KB Output is correct
2 Correct 27 ms 1740 KB Output is correct
3 Correct 31 ms 1868 KB Output is correct
4 Correct 2 ms 332 KB Output is correct
5 Correct 2 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 23 ms 1820 KB Output is correct
10 Correct 23 ms 1716 KB Output is correct
11 Correct 28 ms 1740 KB Output is correct
12 Correct 26 ms 1828 KB Output is correct
13 Correct 27 ms 1796 KB Output is correct
14 Correct 27 ms 1824 KB Output is correct

Subtask #3
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 18 ms 1420 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 22 ms 1712 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 21 ms 1720 KB Output is correct
9 Correct 21 ms 1740 KB Output is correct
10 Correct 23 ms 1816 KB Output is correct
11 Correct 22 ms 1740 KB Output is correct
12 Correct 22 ms 1780 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 336 KB Output is correct
19 Correct 23 ms 1816 KB Output is correct
20 Correct 22 ms 1740 KB Output is correct
21 Correct 23 ms 1800 KB Output is correct
22 Correct 22 ms 1740 KB Output is correct

Subtask #4
0 / 63.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 2 ms 332 KB Output is correct
4 Correct 2 ms 332 KB Output is correct
5 Correct 2 ms 336 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 20 ms 388 KB Output is correct
11 Correct 25 ms 332 KB Output is correct
12 Correct 24 ms 332 KB Output is correct
13 Correct 2 ms 332 KB Output is correct
14 Correct 2 ms 332 KB Output is correct
15 Correct 2 ms 332 KB Output is correct
16 Correct 2 ms 332 KB Output is correct
17 Correct 26 ms 1728 KB Output is correct
18 Correct 27 ms 1740 KB Output is correct
19 Correct 31 ms 1868 KB Output is correct
20 Correct 2 ms 332 KB Output is correct
21 Correct 2 ms 332 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 1 ms 332 KB Output is correct
24 Correct 1 ms 332 KB Output is correct
25 Correct 23 ms 1820 KB Output is correct
26 Correct 23 ms 1716 KB Output is correct
27 Correct 28 ms 1740 KB Output is correct
28 Correct 26 ms 1828 KB Output is correct
29 Correct 27 ms 1796 KB Output is correct
30 Correct 27 ms 1824 KB Output is correct
31 Correct 2 ms 332 KB Output is correct
32 Correct 1 ms 332 KB Output is correct
33 Correct 18 ms 1420 KB Output is correct
34 Correct 1 ms 332 KB Output is correct
35 Correct 22 ms 1712 KB Output is correct
36 Correct 1 ms 332 KB Output is correct
37 Correct 1 ms 332 KB Output is correct
38 Correct 21 ms 1720 KB Output is correct
39 Correct 21 ms 1740 KB Output is correct
40 Correct 23 ms 1816 KB Output is correct
41 Correct 22 ms 1740 KB Output is correct
42 Correct 22 ms 1780 KB Output is correct
43 Correct 1 ms 332 KB Output is correct
44 Correct 1 ms 332 KB Output is correct
45 Correct 1 ms 332 KB Output is correct
46 Correct 1 ms 332 KB Output is correct
47 Correct 1 ms 332 KB Output is correct
48 Correct 1 ms 336 KB Output is correct
49 Correct 23 ms 1816 KB Output is correct
50 Correct 22 ms 1740 KB Output is correct
51 Correct 23 ms 1800 KB Output is correct
52 Correct 22 ms 1740 KB Output is correct
53 Correct 27 ms 1748 KB Output is correct
54 Correct 31 ms 1820 KB Output is correct
55 Correct 30 ms 1784 KB Output is correct
56 Correct 2 ms 332 KB Output is correct
57 Correct 2 ms 332 KB Output is correct
58 Correct 127 ms 1484 KB Output is correct
59 Correct 151 ms 1484 KB Output is correct
60 Correct 210 ms 1492 KB Output is correct
61 Correct 125 ms 1480 KB Output is correct
62 Correct 153 ms 1604 KB Output is correct
63 Correct 200 ms 1484 KB Output is correct
64 Correct 761 ms 1856 KB Output is correct
65 Correct 868 ms 1848 KB Output is correct
66 Execution timed out 1052 ms 1804 KB Time limit exceeded
67 Halted 0 ms 0 KB -