Submission #888866

#	Time	Username	Problem	Language	Result	Execution time	Memory
888866		asdasdqwer	Sirni (COCI17_sirni)	C++14	0 / 140	379 ms	587436 KiB

sirni

#pragma GCC optimize("O3")
// #pragma GCC target("avx,avx2,sse4")

#include <bits/stdc++.h>
using namespace std;

struct DSU {
    vector<int32_t> p, r;
    DSU(int32_t n) {
        p.assign(n,0);
        r.assign(n,1);
        for (int i=0;i<n;i++)p[i]=i;
    }

    int get(int32_t i) {
        if (i != p[i]) p[i]=get(p[i]);
        return p[i];
    }

    bool unite(int32_t a,int32_t b) {
        a=get(a);
        b=get(b);
        if (a==b)return false;
        if (r[a]<r[b])swap(a,b);
        p[b]=a;
        r[a]+=r[b];
        return true;
    }
};

signed test(int n, vector<int> b) {
    vector<int32_t> clos(b.back()+1,-1);
    for (int i=0;i<n;i++) {
        clos[b[i]]=i;
    }

    for (int32_t i=clos.size()-2;i>=0;i--) {
        if (clos[i] == -1) {
            clos[i]=clos[i+1];
        }
    }

    // cout<<"here\n";

    typedef array<int32_t,2> pii;
    vector<vector<pii>> edg(b.back()+1);
    for (int i=0;i<n-1;i++) {
        int x=b[i];
        // cout<<x<<"\n";
        vector<int> tmp;
        edg[b[clos[x+1]]%x].push_back({i, clos[x+1]});
        tmp.push_back(clos[x+1]);

        // cout<<"after\n";

        for (int32_t j=2*x;j<=b.back();j+=x) {
            // cout<<j<<" "<<clos[j]<<"\n";
            if (clos[j] != -1) {
                if (tmp.size() == 0) {
                    edg[b[clos[j]]%x].push_back({clos[j], i});
                    tmp.push_back(clos[j]);
                }

                else if (tmp.back() != clos[j]) {
                    edg[b[clos[j]]%x].push_back({clos[j], i});
                    tmp.push_back(clos[j]);
                }
            }
        }

        if (tmp.size() == 0 || tmp.back() != n-1) {
            edg[b.back()%x].push_back({n-1, i});
        }
    }

    DSU d(b.size());
    int cost=0;
    int steps=0;
    bool term=false;
    for (int c=0;c<=b.back();c++) {
        for (auto &x:edg[c]) {
            if (d.unite(x[0], x[1])) {
                cost+=c;
                steps++;

                if (steps == n-1) {
                    term=true;
                    break;
                }
            }
        }

        if (term)break;
    }
    return cost;
}

bool brute() {
    int len=(rand() % 1000)+1000;
    vector<int> b;
    set<int> chose;
    for (int i=0;i<len;i++) {
        int j=(rand()%10000)+1;
        while (chose.find(j) != chose.end()) {
            j=(rand()%10000)+1;
        }

        chose.insert(j);
        b.push_back(j);
    }

    cout<<"gen numbers\n";

    sort(b.begin(),b.end());
    typedef array<int,3> pii;
    vector<pii> g;
    for (int i=0;i<len;i++) {
        for (int j=i+1;j<len;j++) {
            g.push_back({b[j] % b[i], j, i});
        }
    }

    sort(g.begin(),g.end());

    DSU d(len);
    int cost=0;
    for (auto x:g) {
        if (d.unite(x[1], x[2])) {
            // cout<<b[x[1]]<<" "<<b[x[2]]<<"\n";
            cost += x[0];
        }
    }

    cout<<"mst calc\n";

    // cout<<"\n";
    int cost2 = test(len, b);
    cout<<"mst fast\n";
    // cout<<"\n";
    if (cost != cost2) {
        cout<<cost<<" "<<cost2<<"\n";
    }
    // for (int x:b) {
    //     cout<<x<<" ";
    // }
    // cout<<"\n";
    cout<<"finished\n";
    cout.flush();
    return true;
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    int n;cin>>n;
    vector<int> a(n);
    for (int &x:a)cin>>x;
    if (n == 1) {
        cout<<0<<"\n";
        return 0;
    }
    sort(a.begin(),a.end());
    vector<int> b;
    for (int x:a) {
        if (b.size()==0||b.back()!=x)b.push_back(x);
    }

    cout<<test(n,b)<<"\n";
    // brute();
}

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