oj.uz

Submission #307787

# Submission time Handle Problem Language Result Execution time Memory
307787 2020-09-29T10:08:52 Z VEGAnn Comparing Plants (IOI20_plants) C++17
5 / 100
 1085 ms 69228 KB 
#include "plants.h"
#include <bits/stdc++.h>
#define PB push_back
#define sz(x) ((int)x.size())
#define i2 array<int,2>
using namespace std;
const int N = 200100;
const int oo = 2e9;
const int PW = 20;
set<int> locs;
set<int>::iterator iter;
set<i2> mx;
vector<int> vc, glob;
int per[N], psh[4 * N], n, nt[2][N], up[2][N][PW], k;
i2 st[4 * N], mn[4 * N];

void build(int v, int l, int r){
    if (l == r){
        st[v] = {glob[l], l};
        return;
    }

    int md = (l + r) >> 1;

    build(v + v, l, md);
    build(v + v + 1, md + 1, r);

    st[v] = min(st[v + v], st[v + v + 1]);
}

void push(int v){
    if (psh[v] != 0){
        st[v][0] += psh[v];

        if (v + v + 1 < 4 * N){
            psh[v + v] += psh[v];
            psh[1 + v + v] += psh[v];
        }

        psh[v] = 0;
    }
}

void del(int v, int tl, int tr, int l, int r, int vl){
    push(v);

    if (l > r) return;

    if (tl == l && tr == r) {
        psh[v] = vl;
        push(v);
        return;
    }

    int md = (tl + tr) >> 1;

    del(v + v, tl, md, l, min(r, md), vl);
    del(v + v + 1, md + 1, tr, max(md + 1, l), r, vl);

    st[v] = min(st[v + v], st[v + v + 1]);
}

i2 get(int v, int tl, int tr, int l, int r){
    push(v);

    if (l > r) return {oo, 0};

    if (tl == l && tr == r) return st[v];

    int md = (tl + tr) >> 1;

    return min(get(v + v, tl, md, l, min(r, md)),
               get(v + v + 1, md + 1, tr, max(md + 1, l), r));
}

int dist(int fi, int se){
    if (se > fi)
        return se - fi;
    else return se - fi + n;
}

void uhodi(int vl){
    if (sz(locs) <= 2){
        locs.erase(vl);
        mx.clear();
    } else {
        iter = locs.find(vl);

        int PREV, NEXT;

        if (iter == locs.begin())
            PREV = (*(--locs.end()));
        else PREV = (*prev(iter));

        if (next(iter) == locs.end())
            NEXT = (*locs.begin());
        else NEXT = (*next(iter));

        mx.erase({dist(PREV, vl), vl});
        mx.erase({dist(vl, NEXT), NEXT});

        locs.erase(iter);

        mx.insert({dist(PREV, NEXT), NEXT});
    }
}

void prihodi(int vl){
    if (sz(locs) == 0){
        locs.insert(vl);
        return;
    }

    locs.insert(vl);

    iter = locs.find(vl);

    int PREV, NEXT;

    if (iter == locs.begin())
        PREV = (*(--locs.end()));
    else PREV = (*prev(iter));

    if (next(iter) == locs.end())
        NEXT = (*locs.begin());
    else NEXT = (*next(iter));

    mx.erase({dist(PREV, NEXT), NEXT});

    mx.insert({dist(PREV, vl), vl});
    mx.insert({dist(vl, NEXT), NEXT});
}

void BUILD(int v, int l, int r){
    mn[v] = {oo, l};

    if (l == r) return;

    int md = (l + r) >> 1;

    BUILD(v + v, l, md);
    BUILD(v + v + 1, md + 1, r);
}

void update_mn(int v, int l, int r, int ps, int vl){
    if (l == r){
        mn[v] = {vl, l};
        return;
    }

    int md = (l + r) >> 1;

    if (ps <= md)
        update_mn(v + v, l, md, ps, vl);
    else update_mn(v + v + 1, md + 1, r, ps, vl);

    mn[v] = min(mn[v + v], mn[v + v + 1]);
}

i2 get_mn(int v, int tl, int tr, int l, int r){
    if (l > r) return {oo, 0};

    if (tl == l & tr == r) return mn[v];

    int md = (tl + tr) >> 1;

    return min(get_mn(v + v, tl, md, l, min(r, md)),
               get_mn(v + v + 1, md + 1, tr, max(md + 1, l), r));
}

void init(int K, vector<int> r) {
    n = sz(r);
    k = K;

    glob = r;

    build(1, 0, n - 1);

    vc.clear();

    for (int i = 0; i < n; i++)
        if (r[i] == 0)
            vc.PB(i);

    for (int it = 0; it < sz(vc); it++){
        int cur = vc[it];
        int nxt = vc[(it + 1) % sz(vc)];

        locs.insert(cur);

        del(1, 0, n - 1, cur, cur, oo);

        if (sz(vc) == 1) continue;

        if (cur == vc.back()){
            mx.insert({nxt + n - cur, nxt});
        } else {
            mx.insert({nxt - cur, nxt});
        }
    }

    BUILD(1, 0, n - 1);

    for (int it = n - 1; it >= 0; it--){
        assert(sz(locs) > 0);

        int cand = -1;

        if (sz(locs) == 1){
            int vl = (*locs.begin());

            cand = vl;

            uhodi(vl);
        } else {
            cand = (*(--mx.end()))[1];

            uhodi(cand);
        }

        // delete with segment tree

        int rt = cand, lf = cand - k + 1;

        per[cand] = it;

        if (lf < 0){
            lf += n;

            del(1, 0, n - 1, 0, rt, -1);

            i2 cur = get(1, 0, n - 1, 0, rt);

            while (cur[0] == 0){
                prihodi(cur[1]);
                del(1, 0, n - 1, cur[1], cur[1], oo);
                cur = get(1, 0, n - 1, 0, rt);
            }

            del(1, 0, n - 1, lf, n - 1,  -1);

            cur = get(1, 0, n - 1, lf, n - 1);

            while (cur[0] == 0){
                prihodi(cur[1]);
                del(1, 0, n - 1, cur[1], cur[1], oo);
                cur = get(1, 0, n - 1, lf, n - 1);
            }

            cur = min(get_mn(1, 0, n - 1, 0, rt), get_mn(1, 0, n - 1, lf, n - 1));

            if (cur[0] == oo)
                nt[0][cand] = cand;
            else nt[0][cand] = cur[1];
        } else {
            del(1, 0, n - 1, lf, rt, -1);

            i2 cur = get(1, 0, n - 1, lf, rt);

            while (cur[0] == 0){
                prihodi(cur[1]);
                del(1, 0, n - 1, cur[1], cur[1], oo);
                cur = get(1, 0, n - 1, lf, rt);
            }

            cur = get_mn(1, 0, n - 1, lf, rt);

            if (cur[0] == oo)
                nt[0][cand] = cand;
            else nt[0][cand] = cur[1];
        }

        lf = cand; rt = cand + k - 1;

        if (rt >= n){
            rt -= n;

            i2 cur = min(get_mn(1, 0, n - 1, 0, rt), get_mn(1, 0, n - 1, lf, n - 1));

            if (cur[0] == oo)
                nt[1][cand] = cand;
            else nt[1][cand] = cur[1];
        } else {
            i2 cur = get_mn(1, 0, n - 1, lf, rt);

            if (cur[0] == oo)
                nt[1][cand] = cand;
            else nt[1][cand] = cur[1];
        }

        update_mn(1, 0, n - 1, cand, per[cand]);
    }

    for (int i = 0; i < n; i++){
        up[0][i][0] = nt[0][i];
        up[1][i][0] = nt[1][i];
    }

    for (int po = 1; po < PW; po++)
    for (int i = 0; i < n; i++){
        up[0][i][po] = up[0][up[0][i][po - 1]][po - 1];
        up[1][i][po] = up[1][up[1][i][po - 1]][po - 1];
    }

    return;
}

bool smaller(int x, int y){
    // left direction

    int loc = x;

    for (int po = PW - 1; po >= 0; po--){
        int nw = up[0][loc][po];

        int dst = nw - y;

        if (dst < 0) dst += n;

        if (dst < k) continue;

        if (x > y){
            if (nw > y && nw <= x)
                loc = nw;
        } else {
            if (nw <= x || nw > y)
                loc = nw;
        }
    }

    int dst = loc - y;

    if (dst < 0) dst += n;

    if (dst < k && per[loc] < per[y])
        return 1;

    loc = up[0][loc][0];

    dst = loc - y;

    if (dst < 0) dst += n;

    if (x > y){
        if ((loc > y && loc <= x) && dst < k && per[loc] < per[y])
            return 1;
    } else {
        if ((loc <= x || loc > y) && dst < k && per[loc] < per[y])
            return 1;
    }

    //right direction

    loc = x;

    for (int po = PW - 1; po >= 0; po--){
        int nw = up[1][loc][po];

        int dst = loc - y;

        if (dst < 0) dst += n;

        if (dst < k) continue;

        if (x < y){
            if (nw < y && nw >= x)
                loc = nw;
        } else {
            if (nw >= x || nw < y)
                loc = nw;
        }
    }

    dst = y - loc;

    if (dst < 0) dst += n;

    if (dst < k && per[loc] < per[y])
        return 1;

    loc = up[1][loc][0];

    dst = loc - y;

    if (dst < 0) dst += n;

    if (x < y){
        if ((loc < y && loc >= x) && dst < k && per[loc] < per[y])
            return 1;
    } else {
        if ((loc >= x || loc < y) && dst < k && per[loc] < per[y])
            return 1;
    }

    return 0;
}

int compare_plants(int x, int y) {
    if (smaller(x, y)) return -1;
    if (smaller(y, x)) return +1;

    return 0;
}

Compilation message

plants.cpp: In function 'std::array<int, 2> get_mn(int, int, int, int, int)':
plants.cpp:163:12: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
  163 |     if (tl == l & tr == r) return mn[v];
      |         ~~~^~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 114 ms 3192 KB Output is correct
7 Correct 215 ms 8700 KB Output is correct
8 Correct 975 ms 59504 KB Output is correct
9 Correct 1016 ms 59120 KB Output is correct
10 Correct 1026 ms 59376 KB Output is correct
11 Correct 1058 ms 60400 KB Output is correct
12 Correct 1052 ms 59888 KB Output is correct
13 Correct 1085 ms 69228 KB Output is correct
14 Correct 854 ms 49656 KB Output is correct

Subtask #2
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Incorrect 1 ms 384 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Incorrect 1 ms 384 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #4
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Incorrect 137 ms 3704 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 4 ms 512 KB Output is correct
7 Correct 31 ms 1024 KB Output is correct
8 Incorrect 29 ms 1152 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Incorrect 4 ms 640 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #7
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 114 ms 3192 KB Output is correct
7 Correct 215 ms 8700 KB Output is correct
8 Correct 975 ms 59504 KB Output is correct
9 Correct 1016 ms 59120 KB Output is correct
10 Correct 1026 ms 59376 KB Output is correct
11 Correct 1058 ms 60400 KB Output is correct
12 Correct 1052 ms 59888 KB Output is correct
13 Correct 1085 ms 69228 KB Output is correct
14 Correct 854 ms 49656 KB Output is correct
15 Correct 0 ms 384 KB Output is correct
16 Correct 0 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Incorrect 1 ms 384 KB Output isn't correct
20 Halted 0 ms 0 KB -