1. c++ vector 每個元素加上一個特定值 (c++ vector add a constant value for each element)

https://stackoverflow.com/questions/4461446/stl-way-to-add-a-constant-value-to-a-stdvector

vector<int> x = {0,30,80,100,120,150,190,220,250};
//transform可以將函式應用到序列的元素上,bind2nd通過繫結其中一個引數把二元函式轉換成一元函式
transform(x.begin(),x.end(),x.begin(),bind2nd(plus<int>(),1));
//顯示x的值
copy(x.begin(),ostream_iterator<int>(cout," "));

結果： x = {1 31 81 101 121 151 191 221 251}

2. c++判斷vector中是否存在某個元素（c++ judge whether an element exists in the vector）

https://www.techiedelight.com/check-vector-contains-given-element-cpp/

#include <iostream>
#include <vector>
#include <algorithm>

int main()
{
  std::vector<int> v = { 4,7,5,2,6,9 };
  int key = 6;

  if (std::count(v.begin(),v.end(),key))
    std::cout << "Element found";
  else
    std::cout << "Element not found";

  return 0;
}

結果顯示：Element found

3. c++ vector<int> 生成指定個數的順序列表 （c++ generate a sequential vector<int> of special numbers）

https://stackoverflow.com/questions/17694579/use-stdfill-to-populate-vector-with-increasing-numbers

std::vector<int> seq(10);
// 定義在 numeric 標頭檔案中的 iota() 函式模板會用連續的 T 型別值填充序列
std::iota(seq.begin(),seq.end(),0);

結果： seq = {0,1,3,4,8,9}

4. c++ 一條語句列印vector資訊（c++ print out vector by one statement）.

https://stackoverflow.com/questions/10750057/how-to-print-out-the-contents-of-a-vector

vector<int> x = {1,4};
//istream_iterator用於從輸入流中讀取連續的元素
copy(x.begin()," "));

結果顯示： 1 2 3 4

5. c++ 得到vector<int>中元素的最大值和最小值以及最大值和最小值的索引位置 （c++ get the maximum and minimum values of the elements in vector<int> and the index positions ）

https://riptutorial.com/cplusplus/example/11151/find-max-and-min-element-and-respective-index-in-a-vector

vector<int> row_y = { 502,263,684,324,979 };

// 最大值索引和最大值
int row_y_max_index = max_element(row_y.begin(),row_y.end()) - row_y.begin();
cout << "row_y_max_index = " << row_y_max_index << endl;
int row_y_max_value = *max_element(row_y.begin(),row_y.end());
cout << "row_y_max_value = " << row_y_max_value << endl;

// 最小值索引和最小值
int row_y_min_index = min_element(row_y.begin(),row_y.end()) - row_y.begin();
cout << "row_y_min_index = " << row_y_min_index << endl;
int row_y_min_value = *min_element(row_y.begin(),row_y.end());
cout << "row_y_min_value = " << row_y_min_value << endl;

結果返回：

row_y_max_index = 4
row_y_max_value = 979
row_y_min_index = 1
row_y_min_value = 263

6. c++ vector 相加兩個vector (c++ append a vector to vector)

https://stackoverflow.com/questions/2551775/appending-a-vector-to-a-vector

vector<int> x = {0,250};
vector<int> y = {100};
y.insert(y.end(),x.end());

結果：y = {100,250}

7. c++ 複製vector（c++ copy vector）

https://www.geeksforgeeks.org/ways-copy-vector-c/

vector<int> x = {0,250};
vector<int> y;
y.assign(x.begin(),x.end());

結果：y = {0,250}

8. c++ vector 根據給定索引刪除元素（c++ vector delete element based on a given index）

https://iq.opengenus.org/ways-to-remove-elements-from-vector-cpp/

若想要刪除第2個索引值和到第5個索引值，則可以使用下以語句：

vector<int> x = {0,80};
//remove(x.begin(),80);
x.erase(x.begin() + 2,x.begin() + 5 + 1);

結果： x = {0,80}

9. c++ 刪除vector所有指定元素（c++ delete all specified elements in the vector）

https://www.techiedelight.com/erase-elements-vector-cpp/

vector<int> x = {0,80};
//vector中的remove的作用是將等於value的元素放到vector的尾部，但並不減少vector的size
//vector中erase的作用是刪除掉某個位置position或一段區域（begin,end)中的元素，減少其size
x.erase(remove(x.begin(),30),x.end());

結果： x = {0 150 220 80}

10. c++ 統計 vector 某個元素出現的次數 (C++ count the number of occurrences of an element in vector)

https://www.geeksforgeeks.org/std-count-cpp-stl/

vector<int> x = { 0,3 };
int n = count(x.begin(),3);

結果：n = 3

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