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使用一个额外的 minStack,栈顶元素为当前栈中最小的值。在对栈进行 push 入栈和 pop 出栈操作时,同样需要对 minStack 进行入栈出栈操作,从而使 minStack 栈顶元素一直为当前栈中最小的值。在进行 push 操作时,需要比较入栈元素和当前栈中最小值,将值较小的元素 push 到 minStack 中。
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- <div align =" center " > <img src =" https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20201104013936126.png " alt = " image-20201104013936126 " style = " zoom : 50 % ; " / > </div ><br >
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+ <div align =" center " > <img src =" https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20201104013936126.png " width = " 350px " > </div ><br >
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``` java
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private Stack<Integer > dataStack = new Stack<> ();
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使用一个额外的 minStack,栈顶元素为当前栈中最小的值。在对栈进行 push 入栈和 pop 出栈操作时,同样需要对 minStack 进行入栈出栈操作,从而使 minStack 栈顶元素一直为当前栈中最小的值。在进行 push 操作时,需要比较入栈元素和当前栈中最小值,将值较小的元素 push 到 minStack 中。
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- <div align =" center " > <img src =" https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20201104013936126.png " alt = " image-20201104013936126 " style = " zoom : 50 % ; " / > </div ><br >
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+ <div align =" center " > <img src =" https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20201104013936126.png " width = " 350px " > </div ><br >
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``` java
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private Stack<Integer > dataStack = new Stack<> ();
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