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  • 顺序表的扩容

    #include <stdio.h>
    #include <stdlib.h>
    
    #define ERROR 0
    #define OK 1
    
    typedef struct Vector {
        int size, length;
        int *data;
    } Vector;
    
    void init(Vector *vector, int size) {
        vector->size = size;
        vector->length = 0;
        vector->data = (int *)malloc(sizeof(int) * size);
    }
    
    // 实现扩容函数 expand
    void expand(Vector *vector){
        int *old_data=vector->data;
        //将容量 vector->size更新为原来的2倍
        vector->size=vector->size * 2;
        //让vector->data指向它的首地址
        vector->data =(int *)malloc(sizeof(int) * vector->size);
    
        for(int i=0;i<vector->length;++i){
          vector->data[i]= old_data[i];
        }
       //把旧空间回收
        free(old_data); 
    }
    
    int insert(Vector *vector, int loc, int value) {
        if (loc < 0 || loc > vector->length) {
            return ERROR;
        }
        if (vector->length >= vector->size) {
            //return ERROR;
            //扩容
            expand(vector);
        }
        for (int i = vector->length; i > loc; --i) {
            vector->data[i] = vector->data[i - 1];
        }
        vector->data[loc] = value;
        vector->length++;
        return OK;
    }
    
    void clear(Vector *vector) {
        free(vector->data);
        free(vector);
    }
    
    int main() {
        Vector *a = (Vector *)malloc(sizeof(Vector));
        init(a, 100);
        printf("%d
    ", insert(a, 1, 0));
        printf("%d
    ", insert(a, 0, 1));
        printf("%d
    ", insert(a, 2, 1));
        printf("%d
    ", insert(a, 1, 2));
        printf("%d
    ", insert(a, 0, 3));
        clear(a);
        return 0;
    }
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  • 原文地址:https://www.cnblogs.com/qingjiawen/p/15542109.html
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