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Submission #382192

# Submission time Handle Problem Language Result Execution time Memory
382192 2021-03-26T16:32:55 Z mohamedsobhi777 Cheap flights (LMIO18_pigus_skrydziai) C++14
100 / 100
 1981 ms 152856 KB 
#include <bits/stdc++.h>

using namespace std;

#define vi vector<int>
#define vll vector<ll>
#define vii vector<pair<int, int>>
#define pii pair<int, int>
#define pll pair<ll, ll>
#define loop(_) for (int __ = 0; __ < (_); ++__)
#define pb push_back
#define f first
#define s second
#define sz(_) ((int)_.size())
#define all(_) _.begin(), _.end()
#define lb lower_bound
#define ub upper_bound

using ll = long long;
using ld = long double;

const int N = 3e5 + 7;
const ll mod = 1e9 + 7;

int n, m;
ll a[N];
int viz[N], col = 1;
ll ans;
map<pii, ll> cost;
vi adj[N];
vi adj2[N];
vii e, e2;
ll disto[N];
int fat[N];

void dfs(int x, int p = 0, int pp = 0)
{
       viz[x] = col;
       fat[x] = p;
       for (auto u : adj[x])
       {
              if (u == p)
                     continue;
              if (viz[u] != col)
              {
                     dfs(u, x, p);
              }
              else
              {
                     e2.pb({u, x});
                     if (p && pp && u == pp)
                     {
                            ans = max(ans, cost[{p, pp}] + cost[{x, p}] + cost[{x, pp}]);
                     }
                     adj2[x].pb(u);
              }
       }
}

void dfz(int x, int p)
{

       map<int, bool> mp;
       for (auto u : adj2[x])
              mp[u] = 1;

       for (auto u : adj[x])
       {
              if (fat[u] == x)
              {
                     dfz(u, x);
                     for (auto v : adj2[u])
                     {
                            if (mp.count(v))
                            {
                                   ans = max(ans, cost[{x, u}] + cost[{x, v}] + cost[{u, v}]);
                            }
                            disto[v] = -2e17;
                     }
              }
       }
       if (x != p)
       {
              for (auto u : adj2[x])
              {
                     disto[u] = cost[{x, u}];
              }
       }
}

void prep(vi &act, vii &e)
{
       act.clear();
       for (auto u : e)
       {
              act.pb(u.f);
              act.pb(u.s);
       }
       for (auto u : act)
       {
              adj[u].clear();
              adj2[u].clear();
              disto[u] = -2e17;
              fat[u] = 0;
       }
       for (auto u : e)
       {
              adj[u.f].pb(u.s);
              adj[u.s].pb(u.f);
       }
}

int main()
{
       ios_base::sync_with_stdio(0);
       cin.tie(0);
#ifndef ONLINE_JUDGE
#endif
       cin >> n >> m;
       for (int i = 0; i < N; ++i)
              disto[i] = -2e17;

       vi act;

       for (int i = 0; i < m; ++i)
       {
              int u, v, w;
              cin >> u >> v >> w;
              a[u] += w;
              a[v] += w;
              ans = max({ans, a[u], a[v]});
              e.pb({u, v});
              cost[{u, v}] = cost[{v, u}] = w;
       }

       while (sz(e))
       {
              prep(act, e);
              for (auto u : act)
              {
                     if (viz[u] != col)
                     {
                            dfs(u, 0, 0);
                            dfz(u, 0);
                     }
              }
              e = e2;
              e2.clear();
              ++col;
              break;
       }

       cout << ans;
       return 0;
}

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 16748 KB Output is correct
2 Correct 12 ms 16876 KB Output is correct
3 Correct 12 ms 16748 KB Output is correct
4 Correct 13 ms 16748 KB Output is correct
5 Correct 13 ms 16748 KB Output is correct
6 Correct 47 ms 22204 KB Output is correct
7 Correct 12 ms 16748 KB Output is correct
8 Correct 12 ms 16748 KB Output is correct
9 Correct 12 ms 16876 KB Output is correct
10 Correct 12 ms 16748 KB Output is correct
11 Correct 13 ms 17004 KB Output is correct
12 Correct 13 ms 16876 KB Output is correct
13 Correct 12 ms 16876 KB Output is correct
14 Correct 12 ms 16748 KB Output is correct
15 Correct 12 ms 16748 KB Output is correct
16 Correct 12 ms 16748 KB Output is correct
17 Correct 14 ms 16748 KB Output is correct
18 Correct 15 ms 17132 KB Output is correct
19 Correct 16 ms 17644 KB Output is correct
20 Correct 13 ms 16888 KB Output is correct
21 Correct 12 ms 16748 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 16748 KB Output is correct
2 Correct 12 ms 16876 KB Output is correct
3 Correct 12 ms 16748 KB Output is correct
4 Correct 13 ms 16748 KB Output is correct
5 Correct 13 ms 16748 KB Output is correct
6 Correct 47 ms 22204 KB Output is correct
7 Correct 12 ms 16748 KB Output is correct
8 Correct 12 ms 16748 KB Output is correct
9 Correct 12 ms 16876 KB Output is correct
10 Correct 12 ms 16748 KB Output is correct
11 Correct 13 ms 17004 KB Output is correct
12 Correct 13 ms 16876 KB Output is correct
13 Correct 12 ms 16876 KB Output is correct
14 Correct 12 ms 16748 KB Output is correct
15 Correct 12 ms 16748 KB Output is correct
16 Correct 12 ms 16748 KB Output is correct
17 Correct 14 ms 16748 KB Output is correct
18 Correct 15 ms 17132 KB Output is correct
19 Correct 16 ms 17644 KB Output is correct
20 Correct 13 ms 16888 KB Output is correct
21 Correct 12 ms 16748 KB Output is correct
22 Correct 1981 ms 152856 KB Output is correct
23 Correct 1115 ms 150348 KB Output is correct
24 Correct 49 ms 22372 KB Output is correct
25 Correct 26 ms 18540 KB Output is correct
26 Correct 21 ms 18540 KB Output is correct
27 Correct 16 ms 17388 KB Output is correct
28 Correct 649 ms 71068 KB Output is correct
29 Correct 278 ms 38752 KB Output is correct
30 Correct 494 ms 50268 KB Output is correct
31 Correct 13 ms 17004 KB Output is correct
32 Correct 13 ms 17004 KB Output is correct
33 Correct 960 ms 127556 KB Output is correct
34 Correct 858 ms 118736 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 339 ms 52096 KB Output is correct
2 Correct 869 ms 77916 KB Output is correct
3 Correct 221 ms 37220 KB Output is correct
4 Correct 429 ms 55772 KB Output is correct
5 Correct 1288 ms 103888 KB Output is correct
6 Correct 255 ms 50268 KB Output is correct
7 Correct 286 ms 90976 KB Output is correct
8 Correct 349 ms 81104 KB Output is correct
9 Correct 17 ms 21612 KB Output is correct
10 Correct 250 ms 50136 KB Output is correct
11 Correct 422 ms 82640 KB Output is correct
12 Correct 470 ms 83668 KB Output is correct
13 Correct 12 ms 16748 KB Output is correct
14 Correct 282 ms 44128 KB Output is correct

Subtask #4
47.0 / 47.0

# Verdict Execution time Memory Grader output
1 Correct 339 ms 52096 KB Output is correct
2 Correct 869 ms 77916 KB Output is correct
3 Correct 221 ms 37220 KB Output is correct
4 Correct 429 ms 55772 KB Output is correct
5 Correct 1288 ms 103888 KB Output is correct
6 Correct 255 ms 50268 KB Output is correct
7 Correct 286 ms 90976 KB Output is correct
8 Correct 349 ms 81104 KB Output is correct
9 Correct 17 ms 21612 KB Output is correct
10 Correct 250 ms 50136 KB Output is correct
11 Correct 422 ms 82640 KB Output is correct
12 Correct 470 ms 83668 KB Output is correct
13 Correct 12 ms 16748 KB Output is correct
14 Correct 282 ms 44128 KB Output is correct
15 Correct 12 ms 16748 KB Output is correct
16 Correct 12 ms 16876 KB Output is correct
17 Correct 12 ms 16748 KB Output is correct
18 Correct 13 ms 16748 KB Output is correct
19 Correct 13 ms 16748 KB Output is correct
20 Correct 47 ms 22204 KB Output is correct
21 Correct 12 ms 16748 KB Output is correct
22 Correct 12 ms 16748 KB Output is correct
23 Correct 12 ms 16876 KB Output is correct
24 Correct 12 ms 16748 KB Output is correct
25 Correct 13 ms 17004 KB Output is correct
26 Correct 13 ms 16876 KB Output is correct
27 Correct 12 ms 16876 KB Output is correct
28 Correct 12 ms 16748 KB Output is correct
29 Correct 12 ms 16748 KB Output is correct
30 Correct 12 ms 16748 KB Output is correct
31 Correct 14 ms 16748 KB Output is correct
32 Correct 15 ms 17132 KB Output is correct
33 Correct 16 ms 17644 KB Output is correct
34 Correct 13 ms 16888 KB Output is correct
35 Correct 12 ms 16748 KB Output is correct
36 Correct 1981 ms 152856 KB Output is correct
37 Correct 1115 ms 150348 KB Output is correct
38 Correct 49 ms 22372 KB Output is correct
39 Correct 26 ms 18540 KB Output is correct
40 Correct 21 ms 18540 KB Output is correct
41 Correct 16 ms 17388 KB Output is correct
42 Correct 649 ms 71068 KB Output is correct
43 Correct 278 ms 38752 KB Output is correct
44 Correct 494 ms 50268 KB Output is correct
45 Correct 13 ms 17004 KB Output is correct
46 Correct 13 ms 17004 KB Output is correct
47 Correct 960 ms 127556 KB Output is correct
48 Correct 858 ms 118736 KB Output is correct
49 Correct 701 ms 60116 KB Output is correct
50 Correct 682 ms 60980 KB Output is correct
51 Correct 758 ms 69688 KB Output is correct
52 Correct 1173 ms 77168 KB Output is correct
53 Correct 181 ms 35812 KB Output is correct
54 Correct 1102 ms 100680 KB Output is correct
55 Correct 830 ms 143696 KB Output is correct
56 Correct 513 ms 101344 KB Output is correct
57 Correct 595 ms 76376 KB Output is correct
58 Correct 540 ms 49624 KB Output is correct
59 Correct 1085 ms 101284 KB Output is correct
60 Correct 1198 ms 83412 KB Output is correct
61 Correct 1122 ms 82244 KB Output is correct