Submission #418960

#	Time	Username	Problem	Language	Result	Execution time	Memory
418960		usachevd0	Comparing Plants (IOI20_plants)	C++17	0 / 100	4054 ms	3068 KiB

plants

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

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;
}

namespace sol {
    const int INF32 = 1e9;
    const int maxN = 2e5 + 5;
    int n, k;
    int r[maxN];
    
    int prior[maxN], prior0[maxN];

    int md(int i) {
        return (i % n + n) % n;
    }

    bool in_seg(int x, int l, int r) {
        if (l <= r)
            return l <= x && x <= r;
        return x >= l || x <= r;
    }
    
    namespace sgt {
        const int logN = 18;
        const int N = 1 << logN;
        int mn[2][2 * N];
        int lazy[2][2 * N];
        
        void apply(int v, int delta0, int delta1) {
            mn[0][v] += delta0;
            lazy[0][v] += delta0;
            mn[1][v] += delta1;
            lazy[1][v] += delta1;
        }
        void push(int v) {
            // if (!lazy[0][v] && !lazy[1][v]) return;
            apply(v << 1, lazy[0][v], lazy[1][v]);
            apply(v << 1 | 1, lazy[0][v], lazy[1][v]);
            lazy[0][v] = lazy[1][v] = 0;
        }
        void upd(int v) {
            for (int t = 0; t < 2; ++t)
                mn[t][v] = min(mn[t][v << 1], mn[t][v << 1 | 1]);
        }
        
        void build(int v, int vl, int vr) {
            lazy[0][v] = lazy[1][v] = 0;
            if (vl == vr) {
                mn[0][v] = mn[1][v] = r[vl];
                return;
            }
            int vm = (vl + vr) >> 1;
            build(v << 1, vl, vm);
            build(v << 1 | 1, vm + 1, vr);
            upd(v);
        }
        
        void add(int v, int vl, int vr, int l, int r, int delta0, int delta1) {
            if (l > r || vr < l || r < vl) return;
            if (l <= vl && vr <= r) {
                apply(v, delta0, delta1);
                return;
            }
            int vm = (vl + vr) >> 1;
            push(v);
            add(v << 1, vl, vm, l, r, delta0, delta1);
            add(v << 1 | 1, vm + 1, vr, l, r, delta0, delta1);
            upd(v);
        }
        
        void disable(int v, int vl, int vr, int i, int t) {
            if (vl == vr) {
                mn[t][v] = +INF32;
                return;
            }
            int vm = (vl + vr) >> 1;
            push(v);
            if (i <= vm)
                disable(v << 1, vl, vm, i, t);
            else
                disable(v << 1 | 1, vm + 1, vr, i, t);
            upd(v);
        }
        
        int getFirstZero(int v, int vl, int vr, int t) {
            // debug(v, vl, vr, t, mn[t][v]);
            if (mn[t][v] > 0) return -1;
            if (vl == vr) return vl;
            int vm = (vl + vr) >> 1;
            push(v);
            if (mn[t][v << 1] == 0)
                return getFirstZero(v << 1, vl, vm, t);
            return getFirstZero(v << 1 | 1, vm + 1, vr, t);
        }
        
        int gt(int v, int vl, int vr, int i, int t) {
            if (vl == vr) return mn[t][v];
            int vm = (vl + vr) >> 1;
            push(v);
            if (i <= vm)
                return gt(v << 1, vl, vm, i, t);
            return gt(v << 1 | 1, vm + 1, vr, i, t);
        }
        int gt(int i, int t) {
            return gt(1, 0, n - 1, i, t);
        }
        
        void add(int l, int r, int delta0, int delta1) {
            // cerr << "add " << l << ' ' << r << ' ' << delta0 << ' ' << delta1 << endl;
            if (l <= r)
                add(1, 0, n - 1, l, r, delta0, delta1);
            else {
                add(1, 0, n - 1, 0, r, delta0, delta1);
                add(1, 0, n - 1, l, n - 1, delta0, delta1);
            }
        }
    }
}

void init(int _k, vector<int> _r) {
    using namespace sol;
    n = _r.size();
    k = _k;
    for (int i = 0; i < n; ++i) 
        r[i] = _r[i];
    
    auto dbg = [&]() {
        for (int t = 0; t < 2; ++t) {
            cerr << t << ":   ";
            for (int i = 0; i < n; ++i)
                cerr << sgt::gt(i, t) << ' ';
            cerr << endl;
        }
    };
    
    sgt::build(1, 0, n - 1);
    for (int i = 0; i < n; ++i)
        if (r[i] == 0) {
            sgt::add(md(i + 1), md(i + k - 1), 0, +1);
            sgt::disable(1, 0, n - 1, i, 0);
        }
    for (int y = 0; y < n; ++y) {
        int i = sgt::getFirstZero(1, 0, n - 1, 1);
        prior[i] = y;
        sgt::disable(1, 0, n - 1, i, 0);
        sgt::disable(1, 0, n - 1, i, 1);
        sgt::add(md(i + 1), md(i + k - 1), 0, -1);
        sgt::add(md(i - k + 1), md(i - 1), -1, -1);
        for (int j = sgt::getFirstZero(1, 0, n - 1, 0); j != -1; j = sgt::getFirstZero(1, 0, n - 1, 0)) {
            sgt::add(md(j + 1), md(j + k - 1), 0, +1);
            sgt::disable(1, 0, n - 1, j, 0);
        }
    }
    for (int i = 0; i < n; ++i)
        prior0[i] = prior[i];
}

int compare_plants(int x, int y) {
    using namespace sol;
    
    bool good[2] = {0, 0};
    int rot;
    if (prior0[x] < prior0[y]) {
        good[0] = 1;
        rot = 1;
        swap(x, y);
    }
    else {
        good[1] = 1;
        rot = 0;
    }
        
    sgt::build(1, 0, n - 1);
    for (int i = 0; i < n; ++i)
        if (r[i] == 0) {
            sgt::add(md(i + 1), md(i + k - 1), 0, +1);
            sgt::disable(1, 0, n - 1, i, 0);
        }
    sgt::add(y, y, 0, +1);
    bool bad = false;
    for (int t = 0; t < n; ++t) {
        int i = sgt::getFirstZero(1, 0, n - 1, 1);
        if (i == -1) {
            bad = true;
            break;
        }
        prior[i] = t;
        if (i == x) {
            sgt::add(y, y, 0, -1);
        }
        sgt::disable(1, 0, n - 1, i, 0);
        sgt::disable(1, 0, n - 1, i, 1);
        sgt::add(md(i + 1), md(i + k - 1), 0, -1);
        sgt::add(md(i - k + 1), md(i - 1), -1, -1);
        for (int j = sgt::getFirstZero(1, 0, n - 1, 0); j != -1; j = sgt::getFirstZero(1, 0, n - 1, 0)) {
            sgt::add(md(j + 1), md(j + k - 1), 0, +1);
            sgt::disable(1, 0, n - 1, j, 0);
        }
    }
    
    good[rot] = prior[x] < prior[y];
    
    if (good[0] && good[1])
        return 0;
    if (good[0])
        return +1;
    return -1;
}


#ifdef LOCAL

static int n, k, q;
static std::vector<int> r;
static std:: vector<int> x;
static std:: vector<int> y;
static std:: vector<int> answer;
int main() {
    freopen("in", "r", stdin);
    assert(scanf("%d%d%d", &n, &k, &q) == 3);
    r.resize(n);
    answer.resize(q);
    for (int i = 0; i < n; i++) {
        int value;
        assert(scanf("%d", &value) == 1);
        r[i] = value;
    }
    x.resize(q);
    y.resize(q);
    for (int i = 0; i < q; i++) {
        assert(scanf("%d%d", &x[i], &y[i]) == 2);
    }
    fclose(stdin);

    init(k, r);
    for (int i = 0; i < q; i++) {
        answer[i] = compare_plants(x[i], y[i]);
    }

    for (int i = 0; i < q; i++) {
        printf("%d\n", answer[i]);
    }

    fclose(stdout);

    return 0;
}


// int32_t main() {
//     #ifdef LOCAL
//         freopen("in", "r", stdin);
//     #endif
//     ios::sync_with_stdio(0);
//     cin.tie(0);
    
    
    
    
//     return 0;
// }
#endif

Compilation message (stderr)

plants.cpp: In function 'void init(int, std::vector<int>)':
plants.cpp:177:10: warning: variable 'dbg' set but not used [-Wunused-but-set-variable]
  177 |     auto dbg = [&]() {
      |          ^~~
plants.cpp: In function 'int compare_plants(int, int)':
plants.cpp:230:10: warning: variable 'bad' set but not used [-Wunused-but-set-variable]
  230 |     bool bad = false;
      |          ^~~

• 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