Submission #235191

#	Time	Username	Problem	Language	Result	Execution time	Memory
235191		kartel	Doktor (COCI17_doktor)	C++14	100 / 100	212 ms	42744 KiB

doktor

#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(1e18)
#define el '\n'
#define pii pair <int, int>
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;

vector <int> Le[N];
int pr[N], a[N], kol, i, mid, n, ans = -1, l, r;

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 >> a[i];
        pr[i] = pr[i - 1] + (a[i] == i);
    }
    for (i = 1; i <= n; i++) Le[a[i] + i].pb(abs(a[i] - i));

    for (mid = 2; mid <= n * 2; mid++)
    {
        sort(Le[mid].begin(), Le[mid].end());
        kol = 0;
        for (auto len : Le[mid])
        {
            kol++;
            int left = mid / 2 - len / 2;
            int right = mid / 2 + (len + 1) / 2;

            if (ans < kol - (pr[right] - pr[left]))
            {
                ans = kol - pr[right] + pr[left];
                l = left;
                r = right;
            }
        }
    }

    cout << a[l] << " " << a[r];
}

//
//110000
//110000
//001100
//001100
//000011

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