exercises(matching-brackets): example: avoid using allocator #338
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The user is allowed to add their own reasonable conditions to the contract of a tested function. Illustrate one way to avoid using the allocator.
Also, demonstrate adding the closing character to the stack, not the opening one. This makes the body of the helper function look more natural, and slightly reduces the complexity of the longer line in
isBalanced
.Refs: #313
To-do:
stack
tobuf
.false
if nesting depth exceeds 100.