Submission #334584

#	Time	Username	Problem	Language	Result	Execution time	Memory
334584		talant117408	Evacuation plan (IZhO18_plan)	C++17	100 / 100	790 ms	40936 KiB

plan

/*
    Code written by Talant I.D.
*/
  
#include <bits/stdc++.h>
  
using namespace std;
  
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
  
#define precision(n) fixed << setprecision(n)
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define mp make_pair
#define eps (double)1e-9
#define PI 2*acos(0.0)
#define endl "\n"
#define sz(v) int((v).size())
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define do_not_disturb ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define OK cout << "OK" << endl;
  
inline bool isvowel(char ch){
    ch = tolower(ch);
    return (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u');
}
  
inline bool isprime(int n){
    if(n < 2 || (n%2 == 0 && n != 2)) return false;
    for(int i = 3; i*i <= n; i++)
        if(n%i == 0) return false;
    return true;
}

const int N = 1e5+7;
set <int> st[N];
vector <int> npp;
vector <vector <pii>> graph(N);
int dist[N], n, ans[N];

class Union{
    private:
        vector <int> saizu, link;
    public:
        Union(int n){
            saizu.assign(n+1, 1); link.resize(n+1); 
            iota(all(link), 0);
        }
        int find(int n){
            if(link[n] == n) return n;
            return link[n] = find(link[n]);
        }
        int same(int a, int b){
            return find(a) == find(b);
        }
        void unite(int a, int b, int val){
            if(same(a, b)) return;
             
            a = find(a); b = find(b);
            if(sz(st[a]) < sz(st[b])) swap(a, b);
            
            for(auto to : st[b]){
                if(st[a].count(to)){
                    ans[to] = val;
                }
                else{
                    st[a].insert(to);
                }
            }
            st[b].clear();
            link[b] = a;
        }
        int getsize(int a){
            return saizu[find(a)];
        }
};
 
const int mod = 1e9+7;
 
ll mode(ll a){
    a %= mod;
    if(a < 0) a += mod;
    return a;
}
 
ll subt(ll a, ll b){
    return mode(mode(a)-mode(b));
}
 
ll add(ll a, ll b){
    return mode(mode(a)+mode(b));
}
 
ll mult(ll a, ll b){
    return mode(mode(a)*mode(b));
}
 
ll binpow(ll a, ll b){
    ll res = 1;
    while(b){
        if(b&1) res = mult(res, a);
        a = mult(a, a);
        b >>= 1;
    }
    return res;
}

void dijkstra(){
    for(int i = 1; i <= n; i++){
        dist[i] = 2e9;
    }
    for(auto to : npp) dist[to] = 0;
    priority_queue <pii> K;
    for(auto to : npp) K.push(mp(0, to));
    
    while(sz(K)){
        auto v = K.top(); K.pop();
        for(auto to : graph[v.second]){
            if(dist[to.first] > dist[v.second]+to.second){
                dist[to.first] = dist[v.second]+to.second;
                K.push(mp(-dist[to.first], to.first));
            }
        }
    }
}

bool cmp(int a, int b){
    return dist[a] > dist[b];
}

int main(){
    do_not_disturb
    /*
    int n, m;
    int i, j;
    cin >> n >> m;
    int grid[n+1][m+1];
    int pref[2][n+2][m+2], suff[2][n+2][m+2];
    for(i = 1; i <= n; i++){
        for(j = 1; j <= m; j++){
            char ch;
            cin >> ch;
            if(ch == '0') grid[i][j] = 0;
            else grid[i][j] = 1;
        }
    }
    
    */
    
    int m;
    cin >> n >> m;
    for(int i = 0; i < m; i++){
        int x, y, w;
        cin >> x >> y >> w;
        graph[x].pb(mp(y, w));
        graph[y].pb(mp(x, w));
    }
    
    int k;
    cin >> k;
    npp.resize(k);
    for(auto &to : npp) cin >> to;
    dijkstra();
    
    int q;
    cin >> q;
    
    for(int i = 1; i <= q; i++){
        int x, y;
        cin >> x >> y;
        st[x].insert(i);
        st[y].insert(i);
    }
    
    Union t(n+1);
    
    int id[n+1], vis[n+1];
    for(int i = 1; i <= n; i++){
        id[i] = i;
        vis[i] = 0;
    }
    sort(id+1, id+n+1, cmp);
    for(int i = 1; i <= n; i++){
        vis[id[i]] = 1;
        for(auto to : graph[id[i]]){
            if(vis[to.first]){
                t.unite(id[i], to.first, dist[id[i]]);
            }
        }
    }
    
    for(int i = 1; i <= q; i++){
        cout << ans[i] << endl;
    }
    
    return 0;
}
/*
6 6
000111
011111
011111
111000
111000
111000

6 6
000000
111000
111100
001111
000111
000111
*/

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