Submission #860043

#	Time	Username	Problem	Language	Result	Execution time	Memory
860043		Alfraganus	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++17	77 / 100	3009 ms	243528 KiB

sortbooks

#include <bits/stdc++.h>
using namespace std;
struct tree_type
{
    int s;
    vector<pair<int, int>> arr;
};
vector<tree_type> tree;

vector<int> a;
const int inf = INT_MAX;
void build(int v, int l, int r)
{
    if (l == r)
    {
        tree[v].s = -1;
        tree[v].arr.push_back({a[l - 1], l});
    }
    else
    {
        int m = (l + r) >> 1;
        build(v << 1, l, m);
        build(v << 1 | 1, m + 1, r);
        tree[v] = tree[v << 1];
        tree[v].s = max(tree[v].s, tree[v << 1 | 1].s);

        int mx = inf;

        int i = 0;
        while (i < tree[v << 1 | 1].arr.size() && tree[v << 1 | 1].arr[i] < tree[v].arr.back())
            mx = tree[v << 1 | 1].arr[i++].first;

        if (mx != inf)
            tree[v].s = max(tree[v].arr.back().first + mx, tree[v].s);
        while (i < tree[v << 1 | 1].arr.size())
            tree[v].arr.push_back(tree[v << 1 | 1].arr[i++]);
    }
}
int get(int v, int l, int r, int L, int R, int k)
{
    if (L == l && r == R)
    {
        if (tree[v].s > k)
            throw 1;
        return tree[v].arr.back().first;
    }
    int m = (l + r) >> 1;
    if (R <= m)
        return get(v << 1, l, m, L, R, k);
    else if (m < L)
        return get(v << 1 | 1, m + 1, r, L, R, k);
    else
    {
        int left = get(v << 1, l, m, L, m, k);
        int right = get(v << 1 | 1, m + 1, r, m + 1, R, k);
        if (left * 2 > k)
        {
            auto id = upper_bound(tree[v << 1 | 1].arr.begin(), tree[v << 1 | 1].arr.end(), make_pair(k - left, inf));
            if (id != tree[v << 1 | 1].arr.end() && id->second <= R && left > id->first)
                throw 1;
        }
        return max(left, right);
    }
}
int main()
{
    cin.tie(nullptr)->sync_with_stdio(false);
    int n, q;
    cin >> n >> q;
    a.resize(n);
    int mn = 1e9;
    for (int &x : a)
        cin >> x, mn = min(mn, x);
    vector<pair<pair<int, int>, int>> que(q);
    bool sub3 = 1;
    for (int i = 0; i < q; i++){
        cin >> que[i].first.first >> que[i].first.second >> que[i].second;
        sub3 &= (que[i].second < mn);
    }
    if(sub3){
        vector<int> dp(n);
        for (int i = 0; i < n - 1; i++)
            dp[i + 1] = a[i + 1] < a[i];
        for (int i = 1; i < n; i++)
            dp[i] += dp[i - 1];
        for(int i = 0; i < q; i ++)
            cout << (dp[que[i].first.first - 1] == dp[que[i].first.second - 1]) << endl;
        return 0;
    }
    tree.resize(n << 2);
    build(1, 1, n);
    for (int i = 0, l, r, k; i < q; i++)
    {
        l = que[i].first.first, r = que[i].first.second, k = que[i].second;
        try
        {
            int x = get(1, 1, n, l, r, k);
            cout << "1\n";
        }
        catch (int x)
        {
            cout << "0\n";
        }
    }
    return 0;
}

Compilation message (stderr)

sortbooks.cpp: In function 'void build(int, int, int)':
sortbooks.cpp:30:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |         while (i < tree[v << 1 | 1].arr.size() && tree[v << 1 | 1].arr[i] < tree[v].arr.back())
      |                ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sortbooks.cpp:35:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         while (i < tree[v << 1 | 1].arr.size())
      |                ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sortbooks.cpp: In function 'int main()':
sortbooks.cpp:97:17: warning: unused variable 'x' [-Wunused-variable]
   97 |             int x = get(1, 1, n, l, r, k);
      |                 ^

• Subtask 1: 8 / 8
• Subtask 2: 9 / 9
• Subtask 3: 13 / 13
• Subtask 4: 17 / 17
• Subtask 5: 30 / 30
• Subtask 6: 0 / 23