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Problem · Segment Tree

Dynamic Wall Building and Range Query

● MediumCapital OneFULLTIMEOA

Complete the function below. The function receives the full standard input as a single string and must return the exact standard output lines for the described problem.

Maintain a 1D line of length n with indices 0..n-1, initially with no walls. You are given a sequence of operations of two types:

  • build i: build a wall at index i (idempotent).
  • query l r: check whether there exists at least one wall in the inclusive range [l, r].

For each query operation, output 1 if the range contains at least one wall, otherwise 0.

Input Format (stdin):

  • Line 1: Integer n, the length of the wall line.
  • Line 2: Integer q, the number of operations.
  • Next q lines: Each line is either build i or query l r.

Output Format: Return the query results as an array of lines, one result per query operation, in order. Each result is either 0 or 1.

Examples
01 · Example 1
input = "5\n1\nquery 0 4"
return = ["0"]
Input stdin: '5\n1\nquery 0 4'. Line 1: n=5. Line 2: 1 operation. Line 3: 'query 0 4'. No walls have been built, so the range [0,4] contains no wall. Output is ["0"].
Constraints
  • 1 <= n <= 2 * 105
  • 1 <= q <= 2 * 105 (number of operations)
  • All indices i, l, r satisfy 0 <= l <= r <= n - 1
  • Each operation is either build i or query l r
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public String[] solveOneDynamicWallRangeQuery(String input) {
    // write your code here
}
input"5\n1\nquery 0 4"
expected["0"]
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