Submission #248105

#	Time	Username	Problem	Language	Result	Execution time	Memory
248105		kartel	Sirni (COCI17_sirni)	C++14	84 / 140	2518 ms	50552 KiB

sirni

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
#define in(x) freopen(x, "r", stdin)
#define out(x) freopen(x, "w", stdout)
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("-O3")
#define F first
#define S second
#define pb push_back
#define N +1000500
#define M ll(1e9 + 7)
#define sz(x) (int)x.size()
#define re return
#define oo ll(1e9)
#define el '\n'
//#define el endl
#define pii pair <int, int>
#define err ld(1e-9)
#define last(x) x.back()
#define all(x) (x).begin(), (x).end()
#define arr_all(x, n) (x + 1), (x + 1 + n)
using namespace std;
//using namespace __gnu_pbds;
//typedef tree <int, null_type, less_equal <int> , rb_tree_tag, tree_order_statistics_node_update> ordered_set;
typedef long long ll;
typedef long double ld;

int pr[N], ra[N], i, j, ans, n, p[N], ost, x, y;
vector <pair <int, pair <int, int> > > g;
vector <int> P[N];

int f(int x)
{
    if (pr[x] != x) return (pr[x] = f(pr[x]));
    return x;
}

void link(int x, int y)
{
    x = f(x);
    y = f(y);
    if (x == y) return;

    if (ra[x] > ra[y]) pr[x] = y;
    else
    {
        pr[y] = x;
        if (ra[x] == ra[y]) ra[y]++;
    }
}

int main()
{
    srand(time(0));
    ios_base::sync_with_stdio(0);
    iostream::sync_with_stdio(0);
    ios::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
//
//    in("input.txt");
//    out("output.txt");

    cin >> n;

    for (i = 1; i <= n; i++)
        cin >> p[i], pr[i] = i, ra[i] = 1;

    if (n <= 1000)
    {
        for (i = 1; i <= n; i++)
           for (j = i + 1; j <= n; j++)
        {
            int a = max(p[i], p[j]);
            int b = min(p[i], p[j]);

            g.pb({a % b, {i, j}});
        }

        sort(all(g));
        reverse(all(g));

        while (sz(g))
        {
            int a = g.back().S.F, b = g.back().S.S;
            int cost = g.back().F;
            g.pop_back();

            if (f(a) != f(b))
            {
                ans += cost;
                link(a, b);
            }
        }
    }
    else
    {
        for (i = 1; i <= n; i++)
            P[p[i]].pb(i);

        for (x = 1; x <= 1000000; x++)
            for (i = 1; i < sz(P[x]); i++)
                link(P[x][0], P[x][i]);

        for (ost = 0; ost <= 20; ost++)
           for (x = ost + 1; x <= 1000000; x++)
             {
                 if (!sz(P[x])) continue;

                 for (y = x; y <= 1000000; y += x)
                    {
                        if (y + ost != x && !sz(P[y + ost])) continue;

                        for (auto a : P[y + ost])
                            if (f(a) != f(P[x][0]))
                                link(a, P[x][0]), ans += ost;
                    }
             }
    }

    cout << ans;
}
//
//00000
//00110
//00111
//00011
//00000

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 14 / 14
• Subtask 4: 14 / 14
• Subtask 5: 0 / 14
• Subtask 6: 14 / 14
• Subtask 7: 14 / 14
• Subtask 8: 0 / 14
• Subtask 9: 0 / 14
• Subtask 10: 0 / 14