SegmentTree.js

class SegmentTree {
    constructor(arr) {
        this.n = arr.length;
        this.tree = new Array(4 * this.n);
        this.build(arr, 0, 0, this.n - 1);
    }

    build(arr, node, start, end) {
        if (start === end) {
            this.tree[node] = arr[start];
        } else {
            const mid = Math.floor((start + end) / 2);
            this.build(arr, 2 * node + 1, start, mid);
            this.build(arr, 2 * node + 2, mid + 1, end);
            this.tree[node] = Math.max(this.tree[2 * node + 1], this.tree[2 * node + 2]);
        }
    }

    query(node, start, end, l, r) {
        if (r < start || end < l) {
            return -Infinity;
        }
        if (l <= start && end <= r) {
            return this.tree[node];
        }
        const mid = Math.floor((start + end) / 2);
        const left = this.query(2 * node + 1, start, mid, l, r);
        const right = this.query(2 * node + 2, mid + 1, end, l, r);
        return Math.max(left, right);
    }

    rangeQuery(l, r) {
        return this.query(0, 0, this.n - 1, l, r);
    }
}

function solve(input) {
    const lines = input.trim().split('\n');
    const N = parseInt(lines[0]);
    const A = lines[1].split(' ').map(Number);
    const D = parseInt(lines[2]);
    const queries = lines.slice(3).map((line) => line.split(' ').map(Number));

    const segTree = new SegmentTree(A);
    const results = [];

    for (const [L, R] of queries) {
        const maxLeft = L > 1 ? segTree.rangeQuery(0, L - 2) : -Infinity;
        const maxRight = R < N ? segTree.rangeQuery(R, N - 1) : -Infinity;
        results.push(Math.max(maxLeft, maxRight));
    }

    console.log(results.join('\n'));
}

const fs = require('fs');
const input = fs.readFileSync('/dev/stdin', 'utf-8').trim();
solve(input);