算法-链表实现栈

发布时间：2020-12-16 07:45:30 所属栏目：百科来源：网络整理

导读：今天PHP站长网 52php.cn把收集自互联网的代码分享给大家，仅供参考。原文? http://www.cnblogs.com/xiaofeixiang/p/4558408.html @interface Node : NSObject@property (strong,nonatomic) NSString *value;@property (s

以下代码由PHP站长网 52php.cn收集自互联网

现在PHP站长网小编把它分享给大家，仅供参考

原文? http://www.cnblogs.com/xiaofeixiang/p/4558408.html

@interface Node : NSObject

@property  (strong,nonatomic)  NSString  *value;

@property  (strong,nonatomic)  Node  *next;

@end

Stack头文件定义:

@interface Stack : NSObject
//栈顶的元素
@property  (strong,nonatomic) Node  *first;

@property  (assign,nonatomic) NSInteger  count;

-(BOOL)isEmpty;

-(NSInteger)size;

-(void)push:(NSString *)value;

-(NSString *)pop;

-(void)remove:(NSString *)value;

@end

@implementation Stack
-(BOOL)isEmpty{
  return self.count==0;
}
-(NSInteger)size{
  return self.count;
}
-(void)push:(NSString *)value{
  Node  *oldFirst=self.first;
  self.first=[[Node alloc]init];
  self.first.value=value;
  self.first.next=oldFirst;
  self.count=self.count+1;
}
-(NSString *)pop{
  if (!self.first) {
    return [NSString stringWithFormat:@"-1"];
  }
  NSString *value=self.first.value;
  self.first=self.first.next;
  self.count=self.count-1;
  return value;
}
-(void)remove:(NSString *)value{
  if ([self.first.value isEqualToString:value]) {
    Node *node=self.first;
    Node *nextNode=node.next;
    node.value=nextNode.value;
    node.next=nextNode.next;
    self.count=self.count-1;
  }else{
    Node *node=self.first;
    while (node.next) {
      if ([node.next.value isEqualToString:value]){
        if (node.next.next) {
          Node *tempNode=node.next.next;
          node.next=tempNode;
        }else{
          node.next=NULL;
        }
        self.count=self.count-1;
        break;
      }else{
        node=node.next;
      }
    }
  }
}
@end

测试代码:

tack  *stack=[[Stack alloc]init];
        Node *first=[[Node alloc]init];
        [email?protected]"iOS技术交流群:228407086";
        first.next=NULL;
        stack.first=first;
        [stack push:@"FlyElephant"];
        [stack push:@"博客园"];
        [stack push:@"keso"];
        [stack remove:@"FlyElephant"];
        NSLog(@"出栈:%@",stack.pop);
        NSLog(@"出栈:%@",stack.pop);

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