b.yaml

openapi: "3.0.0"
info:
  version: 1.0.0
  title: Test
servers:
  - url: http://localhost/
paths:
  /test1:
    post:
      requestBody:
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/Test1"
      responses:
        '200':
          description: test
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Test1"
  /test2:
    post:
      requestBody:
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/Test2"
      responses:
        '200':
          description: test
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Test2"
  /test3:
    post:
      requestBody:
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/Test3"
      responses:
        '200':
          description: test
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Test3"
components:
  schemas:
    Test1:
      type: array
      maxItems: 2
      items:
        type: number
    Test2:
      type: array
      minItems: 2
      items:
        type: number
    Test3:
      type: array
      minItems: 3
      maxItems: 3
      items:
        type: number