1. Q: Why Stack::top is initialized to -1 ?
A: Initialize top = -1 make push(char x){ item[++top] = x} method consistent with the API design that stack::top refers to the top element in the stack
1. Q: Why Stack::top is initialized to -1 ?
A: Initialize top = -1 make push(char x){ item[++top] = x} method consistent with the API design that stack::top refers to the top element in the stack
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