Submission #44585

#	Time	Username	Problem	Language	Result	Execution time	Memory
44585		wasyl	Evacuation plan (IZhO18_plan)	C++11	100 / 100	621 ms	28732 KiB

plan

#include <bits/stdc++.h>
#ifndef dbg
#define dbg(...)
#endif
#define all(x) begin(x), end(x)
#define rsz(...) resize(__VA_ARGS__)
#define psh(...) push_back(__VA_ARGS__)
#define emp(...) emplace_back(__VA_ARGS__)
#define prt(...) print(cout, __VA_ARGS__)
#define dmp(...) print(cerr, #__VA_ARGS__, '=', __VA_ARGS__)
#define dprt(...) dbg(print(cerr,__VA_ARGS__))
#define ddmp(...) dbg(dmp(__VA_ARGS__))
using namespace std;using ll=long long;
template<typename t>void print(ostream& os, const t& a){os<<a<<'\n';}
template<typename t, typename... A>void print
(ostream& os, const t& a, A&&... b){os<<a<<' ';print(os, b...);}
template<typename t>using V=vector<t>;

constexpr int oo = 1e9 + 1;

struct Edge
{
    int v, w;
    Edge(int v, int w):
    v(v),w(w){}
};

struct Node : V< Edge >
{
    int val = oo;
};

struct Query
{
    int v, id;
    Query(int v, int id):
    v(v), id(id){}
};

struct Union
{
    V< Query > qs;
    int lid, siz = 1;
};

struct Event
{
    int v, val;
    Event(int v, int val):
    v(v), val(val){}
};

inline bool operator> (const Event& wc, const Event& mn)
{
    return wc.val > mn.val;
}

int curr = oo;
int n, m, k, q;
V< Node > gr;
V< int > odp;
V< bool > vis;
V< Union > tb;
V< Event > evs;
priority_queue< Event, V< Event >, greater< Event > > Q;

inline void dijkstra()
{
    while (not Q.empty())
    {
        int v = Q.top().v;
        int val = Q.top().val;
        Q.pop();

        if (val > gr[v].val)
            continue;
        
        for (auto& ed : gr[v])
        {
            int s = ed.v;
            int dl = ed.w;
            if (gr[s].val > gr[v].val + dl) 
            {
                gr[s].val = gr[v].val + dl;
                Q.emplace(s, gr[s].val);
            }
        }
    }
}

inline int find(int v)
{
    return tb[v].lid == tb[tb[v].lid].lid?
    tb[v].lid : tb[v].lid = find(tb[v].lid);
}

inline void join(int p, int q)
{
    p = find(p);
    q = find(q);
    
    if (p == q)
        return;

    if (tb[p].siz < tb[q].siz)
        swap(p, q);
    
    if (tb[p].qs.size() < tb[q].qs.size())
        swap(tb[p].qs, tb[q].qs);
    
    tb[p].siz += tb[q].siz;
    tb[q].lid = p;
    
    for (auto& qu : tb[q].qs)
    {
        if (find(qu.v) != p)
            tb[p].qs.psh(qu);
        else
            odp[qu.id] = max(odp[qu.id], curr);
    }
    
    tb[q].qs.clear();
    tb[q].qs.shrink_to_fit();
}

inline void add(int v)
{
    vis[v] = true;
    
    for (auto& ed : gr[v])
        if (vis[ed.v])
            join(ed.v, v);
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    cin >> n >> m;    

    gr.rsz(n + 1);
    tb.rsz(n + 1);
    vis.rsz(n + 1);
    
    for (int i = 1; i <= n; ++i)
        tb[i].lid = i;
        
    for (int i = 0; i < m; ++i)
    {
        int p, q, w;
        cin >> p >> q >> w;
        gr[p].emp(q, w);
        gr[q].emp(p, w);    
    }
    
    cin >> k;
    for (int i = 0; i < k; ++i)
    {
        int v; cin >> v;
        gr[v].val = 0;
        Q.emplace(v, 0);
    }
    
    cin >> q;
    odp.rsz(q, 0);   
    for (int i = 0; i < q; ++i)
    {
        int p, q; cin >> p >> q;
        tb[p].qs.emp(q, i);
        tb[q].qs.emp(p, i);
    }

    dijkstra();
    
    for (int i = 1; i <= n; ++i)
        evs.emp(i, gr[i].val);
    
    sort(all(evs), greater< Event >());

    for (auto& ev : evs)
        curr = ev.val, add(ev.v);
 
    for (int i : odp)
        prt(i);                          
}

• Subtask 1: 10 / 10
• Subtask 2: 13 / 13
• Subtask 3: 12 / 12
• Subtask 4: 19 / 19
• Subtask 5: 46 / 46