leetcode 155: C语言一栈解决(accepted)_leetcode c 155-优快云博客

本文介绍了一种名为 MinStack 的数据结构实现方法，该结构能在常数时间内完成压栈、弹栈、获取栈顶元素及栈中最小元素的操作。文章详细展示了如何通过 C 语言进行初始化、压栈、弹栈、获取栈顶元素以及释放内存等关键操作。

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/** initialize your data structure here. */
MinStack* minStackCreate(int maxSize)//correct
{
  MinStack* myStack;
  myStack = (MinStack*)malloc(sizeof(MinStack));
  myStack->head = (int*)malloc(sizeof(int) * maxSize);
  if(!myStack->head)
    {
      perror("malloc");
      exit(-1);
    }
  myStack->stackPointer = -1;
  return myStack;
}

void minStackPush(MinStack* obj, int x)//correct
{
  obj->head[++(obj->stackPointer)] = x;
  if((obj->stackPointer == 0)||(x < obj->minum))//如果栈里只有一个值，那么最小值就为他自己；否则将当前值与最小值比较
    {
      obj->minum = x;
    }
}

void minStackPop(MinStack* obj)//correct
{
  int i;
  if(obj->stackPointer > -1)
    {
      (obj->stackPointer)--;
      obj->minum = obj->head[obj->stackPointer];
      for(i = obj->stackPointer; i >= 0; --i)
        {
          if(obj->head[i] < obj->minum)
           obj-> minum = obj->head[i];
        }
    }
}

int minStackTop(MinStack* obj)
{
  if(obj->stackPointer >= 0)
    {
      return obj->head[obj->stackPointer];
    }
  exit(-1);
}

int minStackGetMin(MinStack* obj)//correct
{
  return obj->minum;
}

void minStackFree(MinStack* obj)//correct
{
  free(obj);
}