Submission #1053670

#	Time	Username	Problem	Language	Result	Execution time	Memory
1053670		tht2005	Commuter Pass (JOI18_commuter_pass)	C++17	24 / 100	86 ms	41324 KiB

commuter_pass

#include <bits/stdc++.h>
#define fi first
#define se second
#define int long long
using namespace std;
 
const int MAXN = 1001;
 
typedef pair<int, int> II;
 
int n, m, s, t, u, v;
long long d[MAXN][MAXN];
vector<II> g[MAXN];
set<II> q;
 
void dijk(int a)
{
    q.insert(II(0, a));
    d[a][a] = 0;
 
    while (!q.empty())
    {
        int x = q.begin()->se;
        q.erase(q.begin());
 
        for (II node : g[x])
        {
            int y = node.fi, w = node.se;
            if (d[a][y] > d[a][x] + w)
            {
                if (d[a][y] < LLONG_MAX)
                    q.erase(II(d[a][y], y));
                d[a][y] = d[a][x] + w;
                q.insert(II(d[a][y], y));
            }
        }
    }
}
 
bool clear[MAXN];
 
int32_t main()
{
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n >> m >> s >> t >> u >> v;
    for (int i = 1; i <= m; ++i)
    {
        int a, b, c;
        cin >> a >> b >> c;
        g[a].push_back(II(b, c));
        g[b].push_back(II(a, c));
    }
 
    for (int i = 1; i <= n; ++i)
        for (int j = 1; j <= n; ++j)
            d[i][j] = LLONG_MAX;
 
    vector<int> T;
    T.push_back(t);
 
    for (int i = 1; i <= n; ++i)
        dijk(i);
 
    long long ans = d[u][v];
  for(int i = 1; i <= n; ++i) {
    if(d[s][i] + d[i][t] != d[s][t]) continue;
    for(int j = 1; j <= n; ++j) {
      if(d[s][i] + d[i][j] + d[j][t] != d[s][t]) continue;
      ans = min(ans, d[u][i] + d[j][v]);
      ans = min(ans, d[u][j] + d[i][v]);
    }
  }
    cout << ans;
}

• Subtask 1: 0 / 16
• Subtask 2: 0 / 15
• Subtask 3: 24 / 24
• Subtask 4: 0 / 45