oj.uz

Submission #915205

# Submission time Handle Problem Language Result Execution time Memory
915205 2024-01-23T13:30:51 Z mychecksedad Olympic Bus (JOI20_ho_t4) C++17
100 / 100
 860 ms 8684 KB 
/* Author : Mychecksdead  */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
const int N = 2000+100, M = 1e5+10, K = 52, MX = 30;



int n, m;
vector<array<ll, 4>> g[N], r[N];
vector<array<ll, 4>> E;
ll d1[N], d2[N], d3[N], d4[N];
vector<bool> in;
void solve(){
  cin >> n >> m;
  in.resize(m);
  for(int i = 0; i < m; ++i){
    int u, v, c, d; cin >> u >> v >> c >> d;
    g[u].pb({v, c, d, i});
    r[v].pb({u, c, d, i});
    E.pb({u, v, c, d});
  }
  for(int i = 1; i <= n; ++i) d1[i] = d2[i] = d3[i] = d4[i] = 1e15;
  
  vector<bool> used(n+1);
  priority_queue<array<ll, 3>> Q;

  Q.push({0, 1, -1});
  d1[1] = 0;
  while(!Q.empty()){
    int v = Q.top()[1]; int e = Q.top()[2]; Q.pop();
    if(used[v]) continue;
    if(e >= 0)
      in[e] = 1;
    used[v] = 1;
    for(auto U: g[v]){
      int u = U[0];
      if(d1[u] > d1[v] + U[1]){
        d1[u] = d1[v] + U[1];
        Q.push({-d1[u], u, U[3]});
      }
    }
  }

  fill(all(used), false);
  Q.push({0, 1, -1});
  d3[1] = 0;
  while(!Q.empty()){
    int v = Q.top()[1]; int e = Q.top()[2]; Q.pop();
    if(used[v]) continue;
    if(e >= 0)
      in[e] = 1;
    used[v] = 1;
    for(auto U: r[v]){
      int u = U[0];
      if(d3[u] > d3[v] + U[1]){
        d3[u] = d3[v] + U[1];
        Q.push({-d3[u], u, U[3]});
      }
    }
  }

  fill(all(used), false);
  Q.push({0, n, -1});
  d2[n] = 0;
  while(!Q.empty()){
    int v = Q.top()[1]; int e = Q.top()[2]; Q.pop();
    if(used[v]) continue;
    if(e >= 0)
      in[e] = 1;
    used[v] = 1;
    for(auto U: g[v]){
      int u = U[0];
      if(d2[u] > d2[v] + U[1]){
        d2[u] = d2[v] + U[1];
        Q.push({-d2[u], u, U[3]});
      }
    }
  }

  fill(all(used), false);
  Q.push({0, n, -1});
  d4[n] = 0;
  while(!Q.empty()){
    int v = Q.top()[1]; int e = Q.top()[2]; Q.pop();
    if(used[v]) continue;
    if(e >= 0)
      in[e] = 1;
    used[v] = 1;
    for(auto U: r[v]){
      int u = U[0];
      if(d4[u] > d4[v] + U[1]){
        d4[u] = d4[v] + U[1];
        Q.push({-d4[u], u, U[3]});
      }
    }
  }

  ll ans = d1[n] + d2[1];
  // cout << d1[n] << ' ' << d2[1] << '\n';

  for(int i = 0; i < m; ++i){
    int u = E[i][0], v = E[i][1];
    ll w = E[i][2], d = E[i][3];
    if(in[i]){
      fill(all(used), false);
      vector<ll> D(n+1, 1e15), D1(n+1, 1e15);
      D[1] = 0;
      Q.push({0, 1, -1});
      while(!Q.empty()){
        int x = Q.top()[1]; Q.pop();
        if(used[x]) continue;
        used[x] = 1;
        for(auto U: g[x]){
          if(U[3] == i) continue;
          int y = U[0];
          if(D[y] > D[x] + U[1]){
            D[y] = D[x] + U[1];
            Q.push({-D[y], y, -1});
          }
        }
        if(x == v){
          if(D[u] > D[v] + w){
            D[u] = D[v] + w;
            Q.push({-D[u], u, -1});
          }
        }
      }
      fill(all(used), false);
      D1[n] = 0;
      Q.push({0, n, -1});
      while(!Q.empty()){
        int x = Q.top()[1]; Q.pop();
        if(used[x]) continue;
        used[x] = 1;
        for(auto U: g[x]){
          if(U[3] == i) continue;
          int y = U[0];
          if(D1[y] > D1[x] + U[1]){
            D1[y] = D1[x] + U[1];
            Q.push({-D1[y], y, -1});
          }
        }
        if(x == v){
          if(D1[u] > D1[v] + w){
            D1[u] = D1[v] + w;
            Q.push({-D1[u], u, -1});
          }
        }
      }
      ans = min(ans, D[n] + D1[1] + d);
      // for(int i = 1; i <= n; ++i) cout << D[i] << ' ';
      // en;
    }else{
      ans = min({
        ans,
        d1[v] + d4[u] + d + w + min(d2[1], d2[v] + d3[u] + w),
        min(d1[n], d1[v] + d4[u] + w) + d2[v] + d3[u] + d + w
      });
    }
  }
  // for(int i = 1; i <= n; ++i){
    // cout << d1[i] << ' ' << d2[i] << '\n';
  // }

  cout << (ans > 1e10 ? -1 : ans);
}



int main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tt = 1, aa;
  // freopen("in.txt", "r", stdin);
  // freopen("out.txt", "w", stdout);
  while(tt--){
    solve();
    // en;
    en;
  }
  cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
  return 0;
}

Compilation message

ho_t4.cpp: In function 'int main()':
ho_t4.cpp:178:15: warning: unused variable 'aa' [-Wunused-variable]
  178 |   int tt = 1, aa;
      |               ^~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 604 KB Output is correct
2 Correct 1 ms 604 KB Output is correct
3 Correct 24 ms 752 KB Output is correct
4 Correct 25 ms 856 KB Output is correct
5 Correct 2 ms 856 KB Output is correct
6 Correct 1 ms 604 KB Output is correct
7 Correct 0 ms 564 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 600 KB Output is correct
10 Correct 18 ms 700 KB Output is correct
11 Correct 22 ms 756 KB Output is correct
12 Correct 21 ms 604 KB Output is correct
13 Correct 5 ms 604 KB Output is correct
14 Correct 12 ms 752 KB Output is correct
15 Correct 10 ms 604 KB Output is correct
16 Correct 13 ms 604 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 163 ms 7884 KB Output is correct
2 Correct 163 ms 7880 KB Output is correct
3 Correct 180 ms 8328 KB Output is correct
4 Correct 21 ms 860 KB Output is correct
5 Correct 8 ms 732 KB Output is correct
6 Correct 1 ms 600 KB Output is correct
7 Correct 1 ms 600 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 55 ms 8064 KB Output is correct
10 Correct 56 ms 7928 KB Output is correct
11 Correct 112 ms 7880 KB Output is correct
12 Correct 112 ms 8292 KB Output is correct
13 Correct 116 ms 8132 KB Output is correct
14 Correct 99 ms 8684 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 604 KB Output is correct
2 Correct 1 ms 600 KB Output is correct
3 Correct 111 ms 6928 KB Output is correct
4 Correct 1 ms 604 KB Output is correct
5 Correct 126 ms 7628 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 49 ms 7628 KB Output is correct
9 Correct 48 ms 8012 KB Output is correct
10 Correct 83 ms 7884 KB Output is correct
11 Correct 81 ms 7628 KB Output is correct
12 Correct 84 ms 7884 KB Output is correct
13 Correct 1 ms 600 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 600 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 87 ms 8392 KB Output is correct
20 Correct 81 ms 7880 KB Output is correct
21 Correct 108 ms 7628 KB Output is correct
22 Correct 89 ms 7880 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 604 KB Output is correct
2 Correct 1 ms 604 KB Output is correct
3 Correct 24 ms 752 KB Output is correct
4 Correct 25 ms 856 KB Output is correct
5 Correct 2 ms 856 KB Output is correct
6 Correct 1 ms 604 KB Output is correct
7 Correct 0 ms 564 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 600 KB Output is correct
10 Correct 18 ms 700 KB Output is correct
11 Correct 22 ms 756 KB Output is correct
12 Correct 21 ms 604 KB Output is correct
13 Correct 5 ms 604 KB Output is correct
14 Correct 12 ms 752 KB Output is correct
15 Correct 10 ms 604 KB Output is correct
16 Correct 13 ms 604 KB Output is correct
17 Correct 163 ms 7884 KB Output is correct
18 Correct 163 ms 7880 KB Output is correct
19 Correct 180 ms 8328 KB Output is correct
20 Correct 21 ms 860 KB Output is correct
21 Correct 8 ms 732 KB Output is correct
22 Correct 1 ms 600 KB Output is correct
23 Correct 1 ms 600 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 55 ms 8064 KB Output is correct
26 Correct 56 ms 7928 KB Output is correct
27 Correct 112 ms 7880 KB Output is correct
28 Correct 112 ms 8292 KB Output is correct
29 Correct 116 ms 8132 KB Output is correct
30 Correct 99 ms 8684 KB Output is correct
31 Correct 14 ms 604 KB Output is correct
32 Correct 1 ms 600 KB Output is correct
33 Correct 111 ms 6928 KB Output is correct
34 Correct 1 ms 604 KB Output is correct
35 Correct 126 ms 7628 KB Output is correct
36 Correct 1 ms 344 KB Output is correct
37 Correct 1 ms 344 KB Output is correct
38 Correct 49 ms 7628 KB Output is correct
39 Correct 48 ms 8012 KB Output is correct
40 Correct 83 ms 7884 KB Output is correct
41 Correct 81 ms 7628 KB Output is correct
42 Correct 84 ms 7884 KB Output is correct
43 Correct 1 ms 600 KB Output is correct
44 Correct 1 ms 348 KB Output is correct
45 Correct 0 ms 348 KB Output is correct
46 Correct 0 ms 600 KB Output is correct
47 Correct 1 ms 348 KB Output is correct
48 Correct 1 ms 348 KB Output is correct
49 Correct 87 ms 8392 KB Output is correct
50 Correct 81 ms 7880 KB Output is correct
51 Correct 108 ms 7628 KB Output is correct
52 Correct 89 ms 7880 KB Output is correct
53 Correct 179 ms 7628 KB Output is correct
54 Correct 194 ms 7820 KB Output is correct
55 Correct 175 ms 7628 KB Output is correct
56 Correct 25 ms 752 KB Output is correct
57 Correct 24 ms 604 KB Output is correct
58 Correct 87 ms 6960 KB Output is correct
59 Correct 94 ms 6864 KB Output is correct
60 Correct 132 ms 6864 KB Output is correct
61 Correct 75 ms 6860 KB Output is correct
62 Correct 97 ms 6824 KB Output is correct
63 Correct 130 ms 6864 KB Output is correct
64 Correct 637 ms 7136 KB Output is correct
65 Correct 669 ms 7308 KB Output is correct
66 Correct 860 ms 7356 KB Output is correct
67 Correct 13 ms 5568 KB Output is correct
68 Correct 66 ms 7880 KB Output is correct
69 Correct 54 ms 8128 KB Output is correct
70 Correct 119 ms 7884 KB Output is correct
71 Correct 117 ms 8128 KB Output is correct
72 Correct 122 ms 7884 KB Output is correct
73 Correct 120 ms 8248 KB Output is correct
74 Correct 116 ms 7876 KB Output is correct