Submission #1051832

#	Time	Username	Problem	Language	Result	Execution time	Memory
1051832		SamAnd	Rope (JOI17_rope)	C++17	100 / 100	427 ms	83576 KiB

rope

#include <bits/stdc++.h>
using namespace std;
#define m_p make_pair
#define all(x) (x).begin(),(x).end()
#define sz(x) ((int)(x).size())
#define fi first
#define se second
typedef long long ll;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
mt19937 rnf(2106);
const int N = 1000006;

int nn;
int n, m;
int c[N];

pair<int, int> a[N];
int ans[N];
vector<int> v[N];

int q[N];
int qq[N];
int maxu;
void ubd(int i, int y)
{
    if (a[i].fi)
        qq[q[a[i].fi]]--;
    if (a[i].se && a[i].se != a[i].fi)
        qq[q[a[i].se]]--;
    q[a[i].fi] += y;
    q[a[i].se] += y;
    if (a[i].fi)
        qq[q[a[i].fi]]++;
    if (a[i].se && a[i].se != a[i].fi)
        qq[q[a[i].se]]++;

    while (1)
    {
        if (qq[maxu + 1])
            ++maxu;
        else if (qq[maxu + 2])
            maxu += 2;
        else
            break;
    }
    while (!qq[maxu])
        --maxu;
}

void solvv()
{
    for (int x = 1; x <= m; ++x)
        v[x].clear();
    memset(q, 0, sizeof q);
    memset(qq, 0, sizeof qq);
    maxu = 0;

    for (int i = 1; i <= n; ++i)
    {
        v[a[i].fi].push_back(i);
        if (a[i].se != a[i].fi)
            v[a[i].se].push_back(i);
    }

    qq[0] = m;
    for (int i = 1; i <= n; ++i)
        ubd(i, 1);

    for (int x = 1; x <= m; ++x)
    {
        int yans = 0;
        for (int i = 0; i < sz(v[x]); ++i)
        {
            int j = v[x][i];
            ubd(j, -1);
            if (a[j].fi == x)
                ++yans;
            if (a[j].se == x)
                ++yans;
        }
        yans += maxu;
        ans[x] = min(ans[x], nn - yans);
        for (int i = 0; i < sz(v[x]); ++i)
        {
            int j = v[x][i];
            ubd(j, 1);
        }
    }
}

void solv()
{
    cin >> n >> m;
    for (int i = 1; i <= n; ++i)
        cin >> c[i];
    nn = n;

    for (int i = 1; i <= m; ++i)
        ans[i] = n;

    if (n % 2 == 0)
    {
        for (int i = 1; i <= n; i += 2)
        {
            a[i / 2 + 1] = m_p(c[i], c[i + 1]);
        }
        n = n / 2;
        solvv();
        n *= 2;
        a[1] = m_p(c[1], 0);
        a[2] = m_p(c[n], 0);
        for (int i = 2; i < n; i += 2)
        {
            a[i / 2 + 2] = m_p(c[i], c[i + 1]);
        }
        n = 2 + (n - 2) / 2;
        solvv();
    }
    else
    {
        a[1] = m_p(c[1], 0);
        for (int i = 2; i <= n; i += 2)
            a[i / 2 + 1] = m_p(c[i], c[i + 1]);
        n = (n - 1) / 2 + 1;
        solvv();
        n = (n - 1) * 2 + 1;
        a[1] = m_p(c[n], 0);
        for (int i = 1; i < n; i += 2)
            a[i / 2 + 2] = m_p(c[i], c[i + 1]);
        solvv();
    }

    for (int i = 1; i <= m; ++i)
        cout << ans[i] << "\n";
}

int main()
{
    #ifdef SOMETHING
    freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    #endif // SOMETHING
    ios_base::sync_with_stdio(false), cin.tie(0);

    int tt = 1;
    //cin >> tt;
    while (tt--)
    {
        solv();
    }
    return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 30 / 30
• Subtask 3: 10 / 10
• Subtask 4: 25 / 25
• Subtask 5: 20 / 20