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void push_bot(stack<int> &s,int x){ if(s.empty()){ s.push(x); return; } int num=s.top(); s.pop(); push_bot(s,x); s.push(num); //just pushing to bottom no reverse } void reverseStack(stack<int> &stack) { if(stack.empty()) return; int t=stack.top(); stack.pop(); reverseStack(stack); push_bot(stack,t); }