Submission #797246

#	Time	Username	Problem	Language	Result	Execution time	Memory
797246		Johann	Diversity (CEOI21_diversity)	C++14	0 / 100	7042 ms	212 KiB

diversity

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

typedef long long ll;
typedef vector<int> vi;
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()

int N, Q;
vi A;
vi B;
ll ans;
vi P;
vi answerPermutation;

ll eval(vi &foo)
{
    ll ret = 0;
    for (int l = 0; l < sz(foo); ++l)
        for (int r = l + 1; r <= sz(foo); ++r)
        {
            int tmp = -1;
            for (int i = l; i < r; ++i)
                if (foo[i] != tmp)
                    ++ret, tmp = foo[i];
        }
    return ret;
}

void bf(int idx)
{
    if (idx == sz(B))
    {
        ll tmpans = eval(P);
        if (tmpans < ans)
        {
            ans = tmpans;
            answerPermutation = P;
        }
    }
    for (int j = 0; j < sz(B); ++j)
    {
        if (P[j] == -1)
        {
            P[j] = B[idx];
            bf(idx + 1);
            P[j] = -1;
        }
    }
}

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

    cin >> N >> Q;
    A.resize(N);
    for (int i = 0; i < N; ++i)
        cin >> A[i];

    while (Q--)
    {
        int lx, rx;
        cin >> lx >> rx;
        --lx;
        B = vi(A.begin() + lx, A.begin() + rx);

        ans = INT_MAX;

        P.assign(sz(B), -1);
        bf(0);

        sort(all(B));
        ll sortans = 0;
        for (int l = 0; l < sz(B); ++l)
            for (int r = l + 1; r <= sz(B); ++r)
            {
                int tmp = -1;
                for (int i = l; i < r; ++i)
                    if (B[i] != tmp)
                        ++sortans, tmp = B[i];
            }
        // cout << "\n";
        cout << ans << "\n";
        // for (int x : answerPermutation)
        //            cout << x << " ";
        //      cout << '\n';
        // cout << sortans << "\n";
    }

    return 0;
}

• Subtask 1: 0 / 4
• Subtask 2: 0 / 10
• Subtask 3: 0 / 8
• Subtask 4: 0 / 16
• Subtask 5: 0 / 26
• Subtask 6: 0 / 36