C++知识点vector系列.md

• 本文链接
• insert函数
• std::unique()函数

• 击打

#include 
#include 
#include 
#include 


int main(void)
{
 std::vector a;
 a.push_back("a0");
 a.push_back("a1");
 std::vector b;
 b.push_back("b");
 b.push_back("c");

 a.insert(a.begin(), "aaa");

for (int i = 0; i< a.size();i++)
std::cout << a[i] << std::endl;
a.insert(a.end(), b.begin(), b.end());

for (int i = 0; i< a.size();i++)
std::cout << a[i] << std::endl;

 return 1;
}

aaa
a0
a1
aaa
a0
a1
b
c

• 上面真好，说明insert的时候指定的位置！
  • 我就要把数据插入在这个位置之前哦！

#include 
#include 

int main(void)
{
    int a[8] = {2, 2, 4, 4, 6, 7, 8};
    int c;

    //std::sort(a, a + 8);  //对于无序的数组需要先排序

    c = (std::unique(a, a + 8) - a );

    std::cout<< "c = " << c << std::endl;

    //打印去重后的数组成员
    for (int i = 0; i < c; i++)
        std::cout<< "a = [" << i << "] = " << a[i] << std::endl;

    return 0;
}

c = 6
a = [0] = 2
a = [1] = 4
a = [2] = 6
a = [3] = 7
a = [4] = 8
a = [5] = 0

• 所以你要先排序啊！