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SpecialStack.cpp
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SpecialStack.cpp
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#include<bits/stdc++.h>
using namespace std;
class SpecialStack {
// Define the data members.
stack<int> s;
int minimum;
/*----------------- Public Functions of SpecialStack -----------------*/
public:
void push(int data) {
// Implement the push() function.
if(s.empty()) {
s.push(data);
minimum = data;
return;
}
if(data < minimum) {
int value = 2*data - minimum;
minimum = data;
s.push(value);
return;
}
s.push(data);
}
int pop() {
if(s.empty()) return -1;
int cur = s.top();
if(cur >= minimum) {
s.pop();
return cur;
}
int value = 2*minimum - cur;
int temp = minimum;
minimum = value;
s.pop();
return temp;
}
int top() {
if (s.empty()) return -1;
int cur = s.top();
if(cur >= minimum) return cur;
return minimum;
}
bool isEmpty() {
return s.empty();
}
int getMin() {
return minimum;
}
};