oj.uz

Submission #400139

# Submission time Handle Problem Language Result Execution time Memory
400139 2021-05-07T12:56:55 Z SavicS Olympic Bus (JOI20_ho_t4) C++14
37 / 100
 1000 ms 3404 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<pii> 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(auto 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(auto c : rg[v.se]){
            int u = c.fi;
            int w = c.se;
            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({u, c});
        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) << endl;

    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

# Verdict Execution time Memory 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 3 ms 348 KB Output is correct
5 Correct 1 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 1 ms 332 KB Output is correct
10 Correct 20 ms 332 KB Output is correct
11 Correct 26 ms 332 KB Output is correct
12 Correct 25 ms 396 KB Output is correct
13 Correct 2 ms 356 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

# Verdict Execution time Memory Grader output
1 Correct 26 ms 2136 KB Output is correct
2 Correct 31 ms 2128 KB Output is correct
3 Correct 28 ms 2112 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 2 ms 332 KB Output is correct
9 Correct 23 ms 3280 KB Output is correct
10 Correct 23 ms 3276 KB Output is correct
11 Correct 28 ms 3268 KB Output is correct
12 Correct 28 ms 3316 KB Output is correct
13 Correct 27 ms 3228 KB Output is correct
14 Correct 27 ms 3404 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 18 ms 1652 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 22 ms 2084 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 20 ms 2124 KB Output is correct
9 Correct 21 ms 2036 KB Output is correct
10 Correct 22 ms 2240 KB Output is correct
11 Correct 21 ms 1996 KB Output is correct
12 Correct 22 ms 2164 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 268 KB Output is correct
18 Correct 1 ms 332 KB Output is correct
19 Correct 22 ms 3048 KB Output is correct
20 Correct 23 ms 3012 KB Output is correct
21 Correct 23 ms 2884 KB Output is correct
22 Correct 22 ms 3028 KB Output is correct

Subtask #4
0 / 63.0

# Verdict Execution time Memory 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 3 ms 348 KB Output is correct
5 Correct 1 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 1 ms 332 KB Output is correct
10 Correct 20 ms 332 KB Output is correct
11 Correct 26 ms 332 KB Output is correct
12 Correct 25 ms 396 KB Output is correct
13 Correct 2 ms 356 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 2136 KB Output is correct
18 Correct 31 ms 2128 KB Output is correct
19 Correct 28 ms 2112 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 2 ms 332 KB Output is correct
25 Correct 23 ms 3280 KB Output is correct
26 Correct 23 ms 3276 KB Output is correct
27 Correct 28 ms 3268 KB Output is correct
28 Correct 28 ms 3316 KB Output is correct
29 Correct 27 ms 3228 KB Output is correct
30 Correct 27 ms 3404 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 1652 KB Output is correct
34 Correct 1 ms 332 KB Output is correct
35 Correct 22 ms 2084 KB Output is correct
36 Correct 1 ms 332 KB Output is correct
37 Correct 1 ms 336 KB Output is correct
38 Correct 20 ms 2124 KB Output is correct
39 Correct 21 ms 2036 KB Output is correct
40 Correct 22 ms 2240 KB Output is correct
41 Correct 21 ms 1996 KB Output is correct
42 Correct 22 ms 2164 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 268 KB Output is correct
48 Correct 1 ms 332 KB Output is correct
49 Correct 22 ms 3048 KB Output is correct
50 Correct 23 ms 3012 KB Output is correct
51 Correct 23 ms 2884 KB Output is correct
52 Correct 22 ms 3028 KB Output is correct
53 Correct 29 ms 3012 KB Output is correct
54 Correct 31 ms 2996 KB Output is correct
55 Correct 30 ms 3032 KB Output is correct
56 Correct 3 ms 332 KB Output is correct
57 Correct 2 ms 332 KB Output is correct
58 Correct 130 ms 2716 KB Output is correct
59 Correct 146 ms 2508 KB Output is correct
60 Correct 205 ms 2432 KB Output is correct
61 Correct 122 ms 2512 KB Output is correct
62 Correct 150 ms 2604 KB Output is correct
63 Correct 196 ms 2532 KB Output is correct
64 Correct 779 ms 3000 KB Output is correct
65 Correct 819 ms 2884 KB Output is correct
66 Execution timed out 1058 ms 2856 KB Time limit exceeded
67 Halted 0 ms 0 KB -