Submission #433612

#	Time	Username	Problem	Language	Result	Execution time	Memory
433612		usachevd0	Comparing Plants (IOI20_plants)	C++17	0 / 100	6 ms	8524 KiB

plants

#include <bits/stdc++.h>
#include "plants.h"

using namespace std;

#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define Time (clock() * 1.0 / CLOCKS_PER_SEC)
using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;
using pil = pair<int, ll>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;
using ld = long double;
template<typename T1, typename T2> bool chkmin(T1& x, T2 y) {
    return y < x ? (x = y, true) : false;
}
template<typename T1, typename T2> bool chkmax(T1& x, T2 y) {
    return y > x ? (x = y, true) : false;
}
void debug_out() {
    cerr << endl;
}
template<typename T1, typename... T2> void debug_out(T1 A, T2... B) {
    cerr << ' ' << A;
    debug_out(B...);
}
template<typename T> void mdebug_out(T* a, int n) {
    for (int i = 0; i < n; ++i)
        cerr << a[i] << ' ';
    cerr << endl;
}
#ifdef LOCAL
    #define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
    #define mdebug(a, n) cerr << #a << ": ", mdebug_out(a, n)
#else
    #define debug(...) 1337
    #define mdebug(a, n) 1337
#endif
template<typename T> ostream& operator << (ostream& stream, const vector<T>& v) {
    for (auto& e : v)
        stream << e << ' ';
    return stream;
}
template<typename T1, typename T2> ostream& operator << (ostream& stream, const pair<T1, T2>& p) {
    return stream << p.first << ' ' << p.second;
}


const int INF32 = 1e9;
const int maxN = 2e5 + 5;
const int logN = 18;
int n, k;
int r[maxN];
int p[maxN];

int md(int x) {
    if ((x %= n) < 0)
        x += n;
    return x;
}

struct sgt {
    static const int N = 1 << logN;
    int mn[2 * N];
    int lazy[2 * N];

    void apply(int v, int d) {
        mn[v] += d;
        lazy[v] += d;
    }

    void push(int v) {
        if (!lazy[v] || v >= N) return;
        apply(v << 1, lazy[v]);
        apply(v << 1 | 1, lazy[v]);
    }

    void upd(int v) {
        mn[v] = min(mn[v << 1], mn[v << 1 | 1]);
    }

    void build(int* a) {
        memset(mn, 0x3f, sizeof mn);
        memset(lazy, 0, sizeof lazy);
        for (int i = 0; i < n; ++i)
            mn[i + N] = a[i];
        for (int v = N - 1; v >= 1; --v)
            upd(v);
    }

    void disable(int v, int vl, int vr, int i) {
        if (vl == vr) {
            mn[v] = +INF32;
            return;
        }
        int vm = (vl + vr) >> 1;
        push(v);
        if (i <= vm)
            disable(v << 1, vl, vm, i);
        else
            disable(v << 1 | 1, vm + 1, vr, i);
        upd(v);
    }

    void add(int v, int vl, int vr, int l, int r, int delta) {
        if (l > r || vr < l || r < vl) return;
        if (l <= vl && vr <= r) {
            apply(v, delta);
            return;
        }
        int vm = (vl + vr) >> 1;
        push(v);
        add(v << 1, vl, vm, l, r, delta);
        add(v << 1 | 1, vm + 1, vr, l, r, delta);
        upd(v);
    }
    void add(int l, int r, int delta) {
        if (l <= r)
            add(1, 0, N - 1, l, r, delta);
        else {
            add(1, 0, N - 1, 0, r, delta);
            add(1, 0, N - 1, l, n - 1, delta);
        }
    }

    int GetFirstZero(int v, int vl, int vr, int l, int r) {
        if (l > r || vr < l || r < vl || mn[v] > 0) return -1;
        if (vl == vr) return vl;
        int vm = (vl + vr) >> 1;
        push(v);
        int ansL = GetFirstZero(v << 1, vl, vm, l, r);
        if (ansL != -1)
            return ansL;
        return GetFirstZero(v << 1 | 1, vm + 1, vr, l, r);
    }
} sr, sf;

void init(int _k, vector<int> _r) {
    n = _r.size(), k = _k;
    for (int i = 0; i < n; ++i)
        r[i] = _r[i];
    // vector<int> f(all(_r));
    // for (int i = 0; i < n; ++i)
    //     if (!r[i]) {
    //         for (int t = 1; t < k; ++t)
    //             ++f[md(i + t)];
    //         r[i] = +INF32;
    //     }
    sr.build(r);
    sf.build(r);
    auto travelRZero = [&]() {
        for (int i = sr.GetFirstZero(1, 0, sr.N - 1, 0, n - 1); i != -1; i = sr.GetFirstZero(1, 0, sr.N - 1, 0, n - 1)) {
            sf.add(md(i + 1), md(i + k - 1), +1);
            sr.disable(1, 0, sr.N - 1, i);
        }
    };
    travelRZero();
    // for (int i = 0; i < n; ++i)
    //     if (!r[i])
    //         sgt::add(md(i + 1), md(i + k - 1), +1);
    for (int v = 0; v < n; ++v) {
        int i = sf.GetFirstZero(1, 0, sgt::N - 1, 0, n - 1);
        sf.disable(1, 0, sgt::N - 1, i);
        sf.add(md(i + 1), md(i + k - 1), -1);
        sf.add(md(i - k + 1), md(i - 1), -1);
        sr.add(md(i - k + 1), md(i - 1), -1);
        travelRZero();
        // assert(count(all(f), 0) == 1);
        // int i = find(all(f), 0) - f.begin();
        // f[i] = +INF32;
        // for (int t = 1; t < k; ++t) {
        //     --f[md(i + t)];
        //     --f[md(i - t)];
        //     --r[md(i - t)];
        // }
        // for (int i = 0; i < n; ++i)
        //     if (!r[i]) {
        //         for (int t = 1; t < k; ++t)
        //             ++f[md(i + t)];
        //         r[i] = +INF32;
        //     }
        p[i] = v;
    }
}

int compare_plants(int x, int y) {
    if (p[x] < p[y])
        return 1;
    return -1;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 14
• Subtask 3: 0 / 13
• Subtask 4: 0 / 17
• Subtask 5: 0 / 11
• Subtask 6: 0 / 15
• Subtask 7: 0 / 25