Submission #306086

#	Time	Username	Problem	Language	Result	Execution time	Memory
306086		Vimmer	Comparing Plants (IOI20_plants)	C++14	5 / 100	230 ms	43384 KiB

plants

#include <bits/stdc++.h>
#include "plants.h"
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

#define N 200005
#define PB push_back
#define sz(x) int(x.size())
#define P 31
#define F first
#define M ll(1e9 + 7)
#define S second
#define all(x) x.begin(), x.end()
#define endl '\n'

//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")

using namespace std;
//using namespace __gnu_pbds;

typedef long long ll;

//typedef tree<int, null_type, less_equal <int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

ll mlt(ll a, ll b) {return (a * b) % M;}
ll sm(ll a, ll b) {return (a + b) % M;}

int id, K, h[N];

array <int, 3> t[N * 4];

int psh[N * 4], psp[N * 4], n;

vector <pair <int, int> > gt[N];

vector <int> a;

set <int> g[N];

void updater(int v, int ps, int l, int r)
{
    if (psp[v] == -1) psp[v] = ps;
    else
    {
        int len1, len2;

        if (r < psp[v]) len1 = n - psp[v] + l;
          else l - psp[v];

        if (r < ps) len2 = n - ps + l;
          else l - ps;

        if (len2 > len1) psp[v] = ps;
    }
}
void Push(int v, int tl, int tr)
{
    t[v][0] += psh[v];

    t[v][0] = max(t[v][0], 0);

    if (tl != tr)
    {
        psh[v + v] += psh[v];

        psh[v + v + 1] += psh[v];
    }

    psh[v] = 0;

    if (psp[v] == -1) return;

    if (tl != tr)
    {
        int md = (tl + tr) >> 1;

        updater(v + v, psp[v], tl, md);

        updater(v + v + 1, psp[v], md + 1, tr);
    }

    int psr = t[v][2];

    t[v][1] = max(t[v][1], (psr < psp[v] ? n - psp[v] + psr : psr - psp[v]));

    psp[v] = -1;
}


void com(int v)
{
    if (t[v + v][0] == t[v + v + 1][0])
        {
            if (t[v + v][1] > t[v + v + 1][1]) t[v] = t[v + v];
              else t[v] = t[v + v + 1];
        }
        else
        {
            if (t[v + v][0] < t[v + v + 1][0]) t[v] = t[v + v];
             else t[v] = t[v + v + 1];
        }
}

void bld(int v, int tl, int tr)
{
    psp[v] = -1;

    if (tl == tr) t[v] = {a[tl], 0, tl};
    else
    {
        int md = (tl + tr) >> 1;

        bld(v + v, tl, md);

        bld(v + v + 1, md + 1, tr);

        com(v);
    }
}

void upd(int v, int tl, int tr, int ps)
{
    Push(v, tl, tr);

    if (tr < ps || ps < tl) return;

    if (tl == tr) t[v] = {int(1e9), 0, tl};
      else
      {
          int md = (tl + tr) >> 1;

          upd(v + v, tl, md, ps);

          upd(v + v + 1, md + 1, tr, ps);

          com(v);
      }
}

void upd(int v, int tl, int tr, int l, int r)
{
    Push(v, tl, tr);

    if (tr < l || r < tl || l > r || tl > tr) return;

    if (l <= tl && tr <= r) {psh[v]--; Push(v, tl, tr); return;}

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

    upd(v + v, tl, md, l, r);

    upd(v + v + 1, md + 1, tr, l, r);

    com(v);
}

void upd(int v, int tl, int tr, int l, int r, int ps)
{
    Push(v, tl, tr);

    if (tr < l || r < tl || l > r || tl > tr) return;

    if (l <= tl && tr <= r) {updater(v, ps, tl, tr); Push(v, tl, tr); return;}

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

    upd(v + v, tl, md, l, r, ps);

    upd(v + v + 1, md + 1, tr, l, r, ps);

    com(v);
}

void dfs(int v)
{
    pair <int, int> pt;

    pt.F = id++;

    for (auto it : g[v])
      dfs(it);

    pt.S = id++;

    gt[v].PB(pt);
}

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

    n = sz(r);

    if (k == 2)
    {
        set <int> se; se.clear();

        for (int i = 0; i < sz(r); i++) se.insert(i);

        for (int i = 0; i < sz(r); i++)
        {
            int nxt = (i + 1) % sz(r);

            if (r[i] == 1) {g[nxt].insert(i); se.erase(i);}
              else {g[i].insert(nxt);se.erase(nxt);}
        }

        for (auto it : se) dfs(it);

        return;
    }

    a = r;

    bld(1, 0, n - 1);

    for (int i = 0; i < n; i++)
        if (r[i] == 0)
        {
            upd(1, 0, n - 1, 0, i - 1, i);

            upd(1, 0, n - 1, i + 1, n - 1, i);
        }

    int cur = n;

    while (cur > 0)
    {
        array <int, 3> b = t[1];

        h[b[2]] = cur--;

        upd(1, 0, n - 1, b[2]);

        upd(1, 0, n - 1, max(0, b[2] - k + 1), b[2] - 1, b[2]);

        if (b[2] - k + 1 < 0) upd(1, 0, n - 1, n - abs(b[2] - k + 1), n - 1, b[2]);
    }

	return;
}

int compare_plants(int x, int y)
{
    if (K == 2)
    {
        for (auto it : gt[x])
          for (auto itr : gt[y])
            if (it.F <= itr.F && itr.S <= it.S) return 1;
              else if (itr.F <= it.F && it.S <= itr.S) return -1;

        return 0;
    }

    if (h[x] > h[y]) return 1;

    return -1;
}

//int main()
//{
////    freopen("help.in", "r", stdin); freopen("help.out", "w", stdout);
//
//    ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);
//
//    init(4, {1, 0, 3, 2, 3, 0, 2});
//
//    for (int i = 0; i < 7; i++) cout << h[i] << " ";
//}

Compilation message (stderr)

plants.cpp: In function 'void updater(int, int, int, int)':
plants.cpp:52:18: warning: statement has no effect [-Wunused-value]
   52 |           else l - psp[v];
      |                ~~^~~~~~~~
plants.cpp:55:18: warning: statement has no effect [-Wunused-value]
   55 |           else l - ps;
      |                ~~^~~~
plants.cpp:57:9: warning: 'len2' may be used uninitialized in this function [-Wmaybe-uninitialized]
   57 |         if (len2 > len1) psp[v] = ps;
      |         ^~
plants.cpp:57:9: warning: 'len1' may be used uninitialized in this function [-Wmaybe-uninitialized]
plants.cpp: In function 'void Push(int, int, int)':
plants.cpp:57:9: warning: 'len2' may be used uninitialized in this function [-Wmaybe-uninitialized]
   57 |         if (len2 > len1) psp[v] = ps;
      |         ^~
plants.cpp:49:19: note: 'len2' was declared here
   49 |         int len1, len2;
      |                   ^~~~
plants.cpp:57:9: warning: 'len1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   57 |         if (len2 > len1) psp[v] = ps;
      |         ^~
plants.cpp:49:13: note: 'len1' was declared here
   49 |         int len1, len2;
      |             ^~~~
plants.cpp:57:9: warning: 'len2' may be used uninitialized in this function [-Wmaybe-uninitialized]
   57 |         if (len2 > len1) psp[v] = ps;
      |         ^~
plants.cpp:49:19: note: 'len2' was declared here
   49 |         int len1, len2;
      |                   ^~~~
plants.cpp:57:9: warning: 'len1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   57 |         if (len2 > len1) psp[v] = ps;
      |         ^~
plants.cpp:49:13: note: 'len1' was declared here
   49 |         int len1, len2;
      |             ^~~~
plants.cpp: In function 'void upd(int, int, int, int, int, int)':
plants.cpp:57:9: warning: 'len2' may be used uninitialized in this function [-Wmaybe-uninitialized]
   57 |         if (len2 > len1) psp[v] = ps;
      |         ^~
plants.cpp:49:19: note: 'len2' was declared here
   49 |         int len1, len2;
      |                   ^~~~
plants.cpp:57:9: warning: 'len1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   57 |         if (len2 > len1) psp[v] = ps;
      |         ^~
plants.cpp:49:13: note: 'len1' was declared here
   49 |         int len1, len2;
      |             ^~~~

• Subtask 1: 5 / 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