Submission #668479

#	Time	Username	Problem	Language	Result	Execution time	Memory
668479		Doxeno	Sirni (COCI17_sirni)	C++17	0 / 140	4606 ms	534360 KiB

sirni

#include <bits/stdc++.h>
#include <functional>
#include <numeric>

using namespace std;


int main(){
    int N;
    cin >> N;
    set<int> s;
    int a;

    for(int i = 0; i < N; ++i){
        cin >> a;
        s.insert(-a);
    }
    N = s.size();
    vector<int> v;
    for(auto x: s)v.emplace_back(-x);
    int m = 1e7 + 2;

    vector<vector<int>> p(m);
    for(int j = 0; j < N; ++j){
        for(int i = v[j]; i < m; i += v[j]){
            p[i].push_back(j);
        }
    }

    int c = v[0];
    long long ans = 0;
    vector<vector<pair<int,int>>> adj(N);
    vector<array<int,3>> eg;

    for(int i = 0; i < N; ++i){
        auto x = v[i];
      	if(c > x)--c;
        while(c > x){
            --c;
            for(auto j: p[c]){
                eg.push_back({v[i-1] -c, j, i-1});
            }
        }

        if(c == x && p[x].size() == 1)--c; 
        while(c > 0 && p[c].empty())--c;
        for(auto j: p[c]){
            eg.push_back({x-c, i, j});
        }
    }

    vector<int> dad(N), sz(N, 0);
    iota(dad.begin(), dad.end(), 0);

    function<int(int)> find=[&](int a){
        if(dad[a] != a)dad[a] = find(dad[a]);
        return dad[a];
    };
    auto uni = [&](int a, int b) -> bool{
        a = find(a);
        b = find(b);
        if(a == b)return 0;
        if(sz[a] < sz[b])swap(a,b);
        dad[b] = a;
        sz[a] += sz[b];
        return 1;
    };
    sort(eg.begin(), eg.end());
    for(auto [w, i, j]: eg){
        if(uni(i, j))ans += w;
    }



    cout << ans << endl;
    return 0;
}

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