Submission #1322737

#TimeUsernameProblemLanguageResultExecution timeMemory
1322737lucas110550Obstacles for a Llama (IOI25_obstacles)C++20
24 / 100
131 ms8180 KiB
#include <vector>
#include <algorithm>
#include <iostream>
#include <climits>

using namespace std;

struct SegTree {
    int n;
    vector<int> tree;

    void init(const vector<int>& data) {
        n = data.size();
        tree.assign(2 * n, 0);
        for (int i = 0; i < n; i++) tree[n + i] = data[i];
        for (int i = n - 1; i > 0; i--) tree[i] = max(tree[2 * i], tree[2 * i + 1]);
    }

    int query(int l, int r) {
        int res = -1;
        for (l += n, r += n; l <= r; l /= 2, r /= 2) {
            if (l % 2 == 1) res = max(res, tree[l++]);
            if (r % 2 == 0) res = max(res, tree[r--]);
        }
        return res;
    }
};

void initialize(std::vector<int> T, std::vector<int> H);
bool can_reach(int L, int R, int S, int D);

static int global_max_reachable_T = -1;
static SegTree st;

void initialize(std::vector<int> T, std::vector<int> H) {
    int N = T.size();
    int M = H.size();

    int min_H = 2000000000;
    for (int h : H) {
        if (h < min_H) min_H = h;
    }

    global_max_reachable_T = -1;
    for (int i = 0; i < N; i++) {
        if (T[i] <= min_H) {
            break;
        }
        if (T[i] > global_max_reachable_T) {
            global_max_reachable_T = T[i];
        }
    }

    st.init(H);
}

bool can_reach(int L, int R, int S, int D) {
    if (S > D) std::swap(S, D);
    int path_obstacle = st.query(S, D);
    return global_max_reachable_T > path_obstacle;
}
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