Submission #424479

#	Time	Username	Problem	Language	Result	Execution time	Memory
424479		Osama_Alkhodairy	Factories (JOI14_factories)	C++17	0 / 100	46 ms	48836 KiB

factories

#include <bits/stdc++.h>
#include "factories.h"
//~ #include "grader.cpp"
using namespace std;
#define ll long long
 
const int NN = 500001;
const int K = 20;
const ll INF = (ll)1e18;
 
int mark[NN], s[NN], e[NN], dep[NN], p[NN][K], dfstime;
ll d[NN], ans;
vector <pair <int, ll> > v[NN], g[NN];
 
void dfs(int node, int pnode){
    s[node] = dfstime++;
    p[node][0] = pnode;
    for(int i = 1 ; i < K ; i++){
        p[node][i] = p[p[node][i - 1]][i - 1];
    }
    for(auto &i : v[node]){
        if(i.first == pnode) continue;
        d[i.first] = d[node] + i.second;
        dep[i.first] = dep[node] + 1;
        dfs(i.first, node);
    }
    e[node] = dfstime - 1;
}
bool inside(int x, int y){
    return s[x] <= s[y] && e[y] <= e[x];
}
int lift(int x, int k){
    for(int i = 0 ; i < K ; i++){
        if((k >> i) & 1){
            x = p[x][i];
        }
    }
    return x;
}
int LCA(int x, int y){
    if(dep[x] >= dep[y]) swap(x, y);
    y = lift(y, dep[y] - dep[x]);
    if(x == y) return x;
    for(int i = 0 ; i < K ; i++){
        if(p[x][i] != p[y][i]){
            x = p[x][i];
            y = p[y][i];
        }
    }
    return p[x][0];
}
pair <ll, ll> solve(int node, int pnode){
    pair <ll, ll> cur = make_pair(INF, INF);
    if(mark[node] == 1) cur.first = 0;
    if(mark[node] == 2) cur.second = 0;
    for(auto &i : g[node]){
        if(i.first == pnode) continue;
        auto f = solve(i.first, node);
        f.first += i.second;
        f.second += i.second;
        ans = min(ans, cur.first + f.second);
        ans = min(ans, cur.second + f.first);
        cur.first = min(cur.first, f.first);
        cur.second = min(cur.second, f.second);
    }
    return cur;
}
void Init(int N, int A[], int B[], int D[]) {
    for(int i = 0 ; i < N - 1 ; i++){
        v[A[i]].push_back(make_pair(B[i], D[i]));
        v[B[i]].push_back(make_pair(A[i], D[i]));
    }
    dfs(0, 0);
}
long long Query(int S, int X[], int T, int Y[]) {
    vector <int> all;
    for(int i = 0 ; i < S ; i++){
        assert(mark[X[i]] == 0);
        mark[X[i]] = 1;
        all.push_back(X[i]);
    }
    for(int i = 0 ; i < T ; i++){
        assert(mark[Y[i]] == 0);
        mark[Y[i]] = 2;
        all.push_back(Y[i]);
    }
    sort(all.begin(), all.end(), [&](int l, int r){
        return s[l] < s[r];
    });
    int all_sz = all.size();
    for(int i = 0 ; i < all_sz ; i++){
        all.push_back(LCA(all[i], all[(i + 1) % all.size()]));
    }
    sort(all.begin(), all.end());
    all.erase(unique(all.begin(), all.end()), all.end());
    sort(all.begin(), all.end(), [&](int l, int r){
        return s[l] < s[r];
    });
    for(auto &i : all){
        assert(g[i].size() == 0);
    }
    vector <int> cur;
    for(auto &i : all){
        while(cur.size() && !inside(cur.back(), i)) cur.pop_back();
        if(cur.size()){
            assert(inside(cur.back(), i));
            ll cost = d[i] - d[cur.back()];
            g[cur.back()].push_back(make_pair(i, cost));
            g[i].push_back(make_pair(cur.back(), cost));
        }
        cur.push_back(i);
    }
    assert(cur[0] == all[0]);
    ans = INF;
    solve(all[0], 0);
    for(auto &i : all){
        g[i].clear();
        mark[i] = 0;
    }
    assert(ans < INF);
    return ans;
}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 18
• Subtask 3: 0 / 67