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顺序表实现手写栈模版可背诵用于算法竞赛

顺序表实现手写栈模版可背诵用于算法竞赛

全部代码

#include<iostream> 
usingnamespacestd;
typedefint eT; 

structStack {
int* data;
int size, cap;

    Stack() : data(newint[5]), size(0), cap(5) {}

    ~Stack() {
delete[] data;
    }

    Stack(const Stack&) = delete;
    Stack& operator=(const Stack&) = delete;

boolempty()const{
return size == 0;
    }

voidpush(int x){
if (size == cap) {
int ncap = cap * 2;
int* nd = newint[ncap];
for (int i = 0; i < size; ++i) nd[i] = data[i];
delete[] data;
            data = nd;
            cap = ncap;
        }
        data[size++] = x;
    }

inttop()const{
return data[size - 1];
    }

voidpop(){
        --size;
    }
};

intmain()
{
 Stack s;
 s.push(10);
 s.push(20);
 s.push(30);
cout << s.top() << endl;
 s.pop();
cout << s.top() << endl;
return0;
}

代码解析

这段代码实现了一个动态扩容的整数栈(Stack),下面逐部分分析:


整体结构

这是一个基于动态数组实现的栈,支持自动扩容,遵循后进先出(LIFO)原则。


成员变量

成员
说明
data
指向动态数组的指针,存储栈中元素
size
当前栈中元素个数
cap
当前数组容量

关键函数解析

构造函数

Stack() : data(newint[5]), size(0), cap(5) {}

初始分配容量为 5 的数组,栈为空。

析构函数

~Stack() { delete[] data; }

释放动态分配的内存,防止内存泄漏。

禁用拷贝 初学者可以先不考虑这一段

Stack(const Stack&) = delete;
Stack& operator=(const Stack&) = delete;

删除了拷贝构造和拷贝赋值,防止浅拷贝导致的双重释放(double free)问题。

push(入栈)

voidpush(int x){
if (size == cap) {           // 容量满时扩容
int ncap = cap * 2;      // 容量翻倍
int* nd = newint[ncap];
for (int i = 0; i < size; ++i) nd[i] = data[i];
delete[] data;           // 释放旧数组
        data = nd;               // 指向新数组
        cap = ncap;
    }
    data[size++] = x;
}

当栈满时,容量翻倍(5 → 10 → 20 → …),将旧数据拷贝到新数组,再释放旧数组。这是经典的倍增策略,均摊时间复杂度为 O(1)。

top(查看栈顶)

inttop()constreturn data[size - 1]; }

返回栈顶元素,但没有做空栈检查,如果栈为空会导致越界访问。

pop(出栈)

voidpop(){ --size; }

仅将 size 减 1,没有实际删除数据(逻辑删除),也没有做下溢检查。


main 函数执行流程

Stack s;           // 创建栈,cap=5, size=0
s.push(10);        // 栈:[10]
s.push(20);        // 栈:[10, 20]
s.push(30);        // 栈:[10, 20, 30]
cout << s.top();   // 输出 30
s.pop();           // 栈:[10, 20]
cout << s.top();   // 输出 20

输出结果:

30
20

可改进之处

  • top() 和 pop() 缺少边界检查:空栈时调用会引发未定义行为,建议加入断言或抛出异常。
  • typedef int eT; 未被使用:定义了类型别名但代码中未用到。
  • 没有 shrink 机制:只扩容不缩容,如果大量 pop 后内存不会回收。
  • 异常安全push 中 new 失败时,旧 data 已被释放但新内存未分配成功,会导致数据丢失。更安全的做法是先分配再释放。

基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-07-05 09:55:23 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/832512.html
  2. 运行时间 : 0.221894s [ 吞吐率:4.51req/s ] 内存消耗:4,671.98kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=2643011ebe9f4c9b4fbcc6a7200e57da
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  1. CONNECT:[ UseTime:0.001171s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001544s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000704s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000619s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001483s ]
  6. SELECT * FROM `set` [ RunTime:0.000530s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001349s ]
  8. SELECT * FROM `article` WHERE `id` = 832512 LIMIT 1 [ RunTime:0.012183s ]
  9. UPDATE `article` SET `lasttime` = 1783216523 WHERE `id` = 832512 [ RunTime:0.034741s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000624s ]
  11. SELECT * FROM `article` WHERE `id` < 832512 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001136s ]
  12. SELECT * FROM `article` WHERE `id` > 832512 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001021s ]
  13. SELECT * FROM `article` WHERE `id` < 832512 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001276s ]
  14. SELECT * FROM `article` WHERE `id` < 832512 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001494s ]
  15. SELECT * FROM `article` WHERE `id` < 832512 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001740s ]
0.223551s