Submission #235184

#	Time	Username	Problem	Language	Result	Execution time	Memory
235184		Vimmer	Doktor (COCI17_doktor)	C++14	70 / 100	248 ms	40824 KiB

doktor

#include <bits/stdc++.h>

//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")

#define F first
#define S second
#define sz(x) int(x.size())
#define pb push_back
#define N 500001
#define M ll(1e9 + 7)
#define inf 1e9 + 1e9

using namespace std;

typedef long double ld;
typedef long long ll;

typedef short int si;


vector <int> mid[N], midr[N];

int an, L = 1, R = 1, pr[N], pos[N], a[N];

bool cmp(int x, int y) {return abs(pos[x] - x) < abs(pos[y] - y);}


int main()
{
   // freopen("input.txt", "r", stdin); //freopen("output4.txt", "w", stdout);

    ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    int n;

    cin >> n;

    for (int i = 1; i <= n; i++) {cin >> a[i]; pos[a[i]] = i;}

    for (int i = 1; i <= n; i++)
    {
        pr[i] = 0;

        if (i != 1) pr[i] = pr[i - 1];

        if (a[i] == i) pr[i]++;
    }

    for (int i = 1; i <= n; i++)
    {
        int l = i, r = pos[i];

        if (l > r) swap(l, r);

        if (l == r) continue;

        if ((r - l) % 2 == 0) mid[(r + l) / 2].pb(i); else midr[(r + l) / 2].pb(i);
    }

    for (int i = 1; i <= n; i++)
    {
        sort(mid[i].begin(), mid[i].end(), cmp);

        sort(midr[i].begin(), midr[i].end(), cmp);

        int j = 0;

        while (j < sz(mid[i]))
        {
            int len = abs(pos[mid[i][j]] - i);

            int l = i - len, r = i + len;

            int sum = pr[r] - pr[l - 1] + j + 1 - (a[i] == i ? 1 : 0);

            if (sum > an)
            {
                an = sum;

                L = l; R = r;
            }

            j++;
        }

        j = 0;

        while (j < sz(midr[i]))
        {
            int len = abs(pos[midr[i][j]] - i);

            int l = i - len, r = i + len + 1;

            int sum = pr[r] - pr[l - 1] + j + 1;

            if (sum > an)
            {
                an = sum;

                L = l; R = r;
            }

            j++;
        }
    }
    cout << a[L] << " " << a[R] << endl;
}

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