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155.Min-Stack_v2.cpp
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56 lines (50 loc) · 1.01 KB
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class MinStack {
stack<long long>Stack;
long long Min;
public:
/** initialize your data structure here. */
MinStack() {
}
void push(int x) {
if (Stack.empty())
{
Stack.push(0);
Min = x;
}
else
{
if (x>=Min)
Stack.push(x-Min);
else
{
Stack.push(x-Min);
Min = x;
}
}
}
void pop()
{
if (Stack.top()<0)
Min = Min + (-Stack.top());
Stack.pop();
}
int top() {
int ret;
if (Stack.top()>=0)
ret = Stack.top()+Min;
else
ret = Min;
return ret;
}
int getMin() {
return Min;
}
};
/**
* Your MinStack object will be instantiated and called as such:
* MinStack* obj = new MinStack();
* obj->push(x);
* obj->pop();
* int param_3 = obj->top();
* int param_4 = obj->getMin();
*/