testcases:
  - name: "testcase 1"
    inputs:
    - 1 : [2, 3, 1, 1, 9]
    output: 
    - 1 : True
  - name: "testcase 2"
    inputs:
    - 1 : [3, 2, 1, 0, 4]
    output: 
    - 1 : False
  - name: "testcase 3"
    inputs:
    - 1 : [4, 0, 0, 0, 4]
    output: 
    - 1 : True
  - name: "testcase 4"
    inputs:
    - 1 : [0]
    output: 
    - 1 : True
  - name: "testcase 5"
    inputs:
    - 1 : [1]
    output: 
    - 1 : True