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//Runtime: 40 ms, faster than 11.69%
class MinStack {
private:
stack<int> s1;
stack<int> s2;
public:
/** initialize your data structure here. */
MinStack() {
}
void push(int x) {
s1.push(x);
if(s2.empty() || x <= getMin()) s2.push(x);
}
void pop() {
if(s1.top() == getMin()) s2.pop();
s1.pop();
}
int top() {
return s1.top();
}
int getMin() {
return s2.top();
}
};
/**
* 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();
*/
//Runtime: 28 ms, faster than 53.45%
class MinStack {
public:
/** initialize your data structure here. */
vector<int> stack;
vector<int> min;
MinStack() {
}
void push(int x) {
stack.push_back(x);
if(min.size() && x > min.back()){
min.push_back(min.back());
}
else if(!min.size() || x <= min.back())
min.push_back(x);
}
void pop() {
stack.pop_back();
min.pop_back();
}
int top() {
return stack.back();
}
int getMin() {
return min.back();
}
};
/**
* 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();
*/
//Runtime: 16 ms, faster than 99.48%
class MinStack {
public:
/** initialize your data structure here. */
stack<pair<int,int>> st;
MinStack() {
}
void push(int x) {
int min;
if(st.empty())
min = x;
else
min = std::min(st.top().second,x);
st.push({x,min});
}
void pop() {
st.pop();
}
int top() {
return st.top().first;
}
int getMin() {
return st.top().second;
}
};
/**
* 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();
*/