Cod sursa(job #3365485)

Utilizator De_Azi_Ne_DopamAlex Ardelean De_Azi_Ne_Dopam Data 21 septembrie 2026 18:12:47
Problema Secv8 Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 3.4 kb
#include <bits/stdc++.h>
#pragma GCC optimize("O3,inline")

std::ifstream in("secv8.in");
std::ofstream out("secv8.out");

struct Treap {
    int l, r;
    int val, prio;
    int sz;
    bool lazy;
} v[250005];
int cnt = -1;

int alloc_node(Treap t) {
    v[++cnt] = t;
    return cnt;
}

void push(int node) {
    if (node == -1) {
        return;
    }
    if (v[node].lazy) {
        std::swap(v[node].l, v[node].r);
        if (v[node].l != -1) {
            v[v[node].l].lazy ^= 1;
        }
        if (v[node].r != -1) {
            v[v[node].r].lazy ^= 1;
        }
        v[node].lazy = 0;
    }
}

int merge(int a, int b) {
    push(a);
    push(b);
    if (a == -1) {
        return b;
    }
    if (b == -1) {
        return a;
    }
    if (v[a].prio > v[b].prio) {
        v[a].sz += v[b].sz;
        v[a].r = merge(v[a].r, b);
        return a;
    } else {
        v[b].sz += v[a].sz;
        v[b].l = merge(a, v[b].l);
        return b;
    }
}

int mar(int node) {
    if (node == -1) {
        return 0;
    }
    return v[node].sz;
}

std::pair<int, int> split(int node, int k) {
    push(node);
    if (k == 0) {
        return {-1, node};
    }
    if (k == v[node].sz) {
        return {node, -1};
    }
    if (k <= mar(v[node].l)) {
        v[node].sz -= mar(v[node].l);
        std::pair<int, int> res = split(v[node].l, k);
        v[node].l = res.second;
        v[node].sz += mar(res.second);
        return {res.first, node};
    } else {
        v[node].sz -= mar(v[node].r);
        std::pair<int, int> res = split(v[node].r, k - mar(v[node].l) - 1);
        v[node].r = res.first;
        v[node].sz += mar(res.first);
        return {node, res.second};
    }
}

int access(int node, int k) {
    push(node);
    if (k <= mar(v[node].l)) {
        return access(v[node].l, k);
    } else if (k == mar(v[node].l) + 1) {
        return v[node].val;
    } else {
        return access(v[node].r, k - mar(v[node].l) - 1);
    }
}

void print_trp(int node) {
    if (node == -1) {
        return;
    }
    push(node);
    print_trp(v[node].l);
    out << v[node].val << " ";
    print_trp(v[node].r);
}

int main() {
    std::ios_base::sync_with_stdio(false);
    in.tie(0);
    out.tie(0);
    std::mt19937 rng(
        std::chrono::steady_clock::now().time_since_epoch().count());
    int t, ok, k, e, i, j;
    int root = -1;
    char c;
    in >> t >> ok;
    while (t--) {
        in >> c;
        if (c == 'I') {
            in >> k >> e;
            int c = alloc_node(Treap{-1, -1, e, static_cast<int>(rng()), 1, 0});
            if (root == -1) {
                root = c;
                continue;
            }
            std::pair<int, int> res = split(root, k - 1);
            root = merge(merge(res.first, c), res.second);
        } else if (c == 'A') {
            in >> k;
            out << access(root, k) << '\n';
        } else if (c == 'R') {
            in >> i >> j;
            std::pair<int, int> res1 = split(root, i - 1);
            std::pair<int, int> res2 = split(res1.second, j - i + 1);
            v[res2.first].lazy ^= 1;
            root = merge(res1.first, merge(res2.first, res2.second));
        } else if (c == 'D') {
            in >> i >> j;
            std::pair<int, int> res1 = split(root, i - 1);
            std::pair<int, int> res2 = split(res1.second, j - i + 1);
            root = merge(res1.first, res2.second);
        } else {
            exit(1);
        }
    }
    print_trp(root);
    return 0;
}