LeetCode 155 Min Stack

题目

c++

class MinStack {
public:
    /** initialize your data structure here. */
    int s1[10005];
    int s2[10005];
    
    int top1;
    int top2;
    
    MinStack() {
        top1=-1;
        top2=-1;
    }
    
    void push(int x) {
        s1[++top1] =x;
        
        if(top2==-1)
        {
            s2[++top2]=x;
        }
        else
        {
            if(x<=s2[top2])
            {
                s2[++top2]=x;
            }
        }
    }
    
    void pop() {
        
      if(s1[top1]==s2[top2])
          top2--;
        
             top1--;
    }
    
    int top() {
        return s1[top1];
    }
    
    int getMin() {
        return s2[top2];   
    }
};

/**
 * 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();
 */