Submission #529225

#	Time	Username	Problem	Language	Result	Execution time	Memory
529225		N1NT3NDO	Osumnjičeni (COCI21_osumnjiceni)	C++14	110 / 110	541 ms	30704 KiB

Main

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
#define sz(x) (int)x.size()
#define fi first
#define sd second
#define all(x) x.begin(), x.end()
//#pragma GCC target ("avx2")
//#pragma GCC optimization ("O3")
//#pragma GCC optimization ("unroll-loops")

using namespace std;
//using namespace __gnu_pbds;

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

const int N = (int)2e5 + 5;
int n, l[N], r[N], q, nxt[N], t[8 * N], mod[8 * N], up[N][22];
vector<int> vec;

void push(int v)
{
    mod[v + v] = min(mod[v + v], mod[v]);
    mod[v + v + 1] = min(mod[v + v + 1], mod[v]);
    t[v + v] = min(t[v + v], mod[v]);
    t[v + v + 1] = min(t[v + v + 1], mod[v]);
}

void build(int v, int tl, int tr)
{
    t[v] = n + 1;
    mod[v] = n + 1;
    if (tl == tr)
      return;

    int m = (tl + tr) >> 1;
    build(v + v, tl, m);
    build(v + v + 1, m + 1, tr);
}

int get(int v,      int tl, int tr, int l, int r)
{
    if (tl > tr || tl > r || tr < l) return n + 1;

    if (tl >= l && tr <= r)
      return t[v];

    push(v);
    int m = (tl + tr) >> 1;
    return min(get(v + v, tl, m, l, r), get(v + v + 1, m + 1, tr, l, r));
}

void upd(int v, int tl, int tr, int l, int r, int val)
{
    if (tl > tr || tl > r || tr < l) return;

    if (tl >= l && tr <= r)
    {
        t[v] = val;
        mod[v] = val;
        return;
    }

    int m = (tl + tr) >> 1;
    push(v);
    upd(v + v, tl, m, l, r, val);
    upd(v + v + 1, m + 1, tr, l, r, val);
    t[v] = min(t[v + v], t[v + v + 1]);
}

int get_ans(int a, int b)
{
    int ans = 0;
    for(int i = 19; i >= 0; i--)
      {
          if (up[a][i] <= b)
            a = up[a][i], ans += (1 << i);
      }

    return ans + 1;
}

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n;
    for(int i = 1; i <= n; i++)
    {
        cin >> l[i] >> r[i];
        vec.pb(l[i]);
        vec.pb(r[i]);
    }

    sort(all(vec));
    vec.resize(unique(all(vec)) - vec.begin());
    for(int i = 1; i <= n; i++)
    {
        l[i] = lower_bound(all(vec), l[i]) - vec.begin(); l[i]++;
        r[i] = lower_bound(all(vec), r[i]) - vec.begin(); r[i]++;
    }

    build(1, 1, 2 * n);
    for(int i = n; i >= 1; i--)
    {

        int val = get(1, 1, 2 * n, l[i], r[i]);
        nxt[i] = val;

        upd(1, 1, 2 * n, l[i], r[i], i);
    }

    int mn = n + 1;
    for(int i = n; i >= 1; i--)
    {
        mn = min(mn, nxt[i]);
        nxt[i] = mn;
        up[i][0] = nxt[i];
    }

    for(int j = 0; j <= 19; j++)
      up[n + 1][j] = n + 1;

    for(int j = 1; j <= 19; j++)
    {
        for(int i = 1; i <= n; i++)
            up[i][j] = up[up[i][j - 1]][j - 1];
    }

    cin >> q;
    while(q--)
    {
        int le, ri;
        cin >> le >> ri;
        cout << get_ans(le, ri) << '\n';
    }

}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 20 / 20
• Subtask 4: 20 / 20
• Subtask 5: 50 / 50