verify/aoj_dsl/aoj_dsl_2_d_dual_segment_tree.test.cpp

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Last update: 2024-03-24 17:04:51+09:00
Problem: https://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=DSL_2_D

Depends on

Code

#define PROBLEM "https://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=DSL_2_D"

#include <bits/stdc++.h>

#include "algebra/monoid_f/monoid_set.hpp"
#include "data_structure/dual_segment_tree.hpp"

int main() {
    int N, Q;
    std::cin >> N >> Q;
    DualSegmentTree<MonoidSet<int>> seg(N);
    while (Q--) {
        int t;
        std::cin >> t;
        if (t == 0) {
            int l, r, x;
            std::cin >> l >> r >> x;
            seg.apply(l, r + 1, x);
        } else {
            int i;
            std::cin >> i;
            std::cout << seg[i] << '\n';
        }
    }
    return 0;
}

#line 1 "verify/aoj_dsl/aoj_dsl_2_d_dual_segment_tree.test.cpp"
#define PROBLEM "https://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=DSL_2_D"

#include <bits/stdc++.h>

#line 2 "algebra/monoid_f/monoid_set.hpp"
// MF
template <class T> struct MonoidSet {
    using F = T;
    static constexpr F composition(F f, F g) { return f == id() ? g : f; }
    static constexpr F id() { return std::numeric_limits<F>::max(); }
};
#line 4 "data_structure/dual_segment_tree.hpp"
template <class MF> struct DualSegmentTree {
   public:
    using F = typename MF::F;
    DualSegmentTree() : DualSegmentTree(0) {}
    DualSegmentTree(int n) : DualSegmentTree(std::vector<F>(n, MF::id())) {}
    DualSegmentTree(const std::vector<F>& v) : n((int)(v.size())) {
        log = 0;
        while ((1U << log) < (unsigned int)(n)) log++;
        size = 1 << log;
        lz = std::vector<F>(size << 1, MF::id());
        for (int i = 0; i < n; i++) lz[i + size] = v[i];
    }

    F operator[](int p) {
        assert(0 <= p and p < n);
        p += size;
        for (int i = log; i >= 1; i--) push(p >> i);
        return lz[p];
    }

    F get(int p) {
        assert(0 <= p and p < n);
        p += size;
        for (int i = log; i >= 1; i--) push(p >> i);
        return lz[p];
    }

    void apply(int p, const F& f) {
        assert(0 <= p and p < n);
        p += size;
        for (int i = log; i >= 1; i--) push(p >> i);
        lz[p] = f;
    }

    void apply(int l, int r, const F& f) {
        assert(0 <= l and l <= r and r <= n);
        if (l == r) return;

        l += size;
        r += size;

        for (int i = log; i >= 1; i--) {
            if (((l >> i) << i) != l) push(l >> i);
            if (((r >> i) << i) != r) push((r - 1) >> i);
        }

        {
            int l2 = l, r2 = r;
            while (l < r) {
                if (l & 1) all_apply(l++, f);
                if (r & 1) all_apply(--r, f);
                l >>= 1;
                r >>= 1;
            }
            l = l2;
            r = r2;
        }
    }

   private:
    int n, log, size;
    std::vector<F> lz;
    void all_apply(int k, const F& f) { lz[k] = MF::composition(f, lz[k]); }
    void push(int k) {
        all_apply(k << 1, lz[k]);
        all_apply((k << 1) | 1, lz[k]);
        lz[k] = MF::id();
    }
};
#line 7 "verify/aoj_dsl/aoj_dsl_2_d_dual_segment_tree.test.cpp"

int main() {
    int N, Q;
    std::cin >> N >> Q;
    DualSegmentTree<MonoidSet<int>> seg(N);
    while (Q--) {
        int t;
        std::cin >> t;
        if (t == 0) {
            int l, r, x;
            std::cin >> l >> r >> x;
            seg.apply(l, r + 1, x);
        } else {
            int i;
            std::cin >> i;
            std::cout << seg[i] << '\n';
        }
    }
    return 0;
}