c ++向量操作 [英] c++ vector manipulation

问题描述

我试图删除一个向量中最大的int元素，并将其插入到一个新的向量中。我已经有一个int，表示向量中的最大数字，一个表示该数字的位置。

我的代码：

  vector2.push_back 
 vector1 [highestpos] = vector1 [vector1.size（） -  1]; 
 vector1 [vector1.size（） -  1] = highest; 
 vector1.pop_back（）; 
  

但它返回一个错误。这个代码有什么问题吗？

EDIT ::::::这里是我的代码。我得到的错误是一个声明错误，说向量下标超出范围。

  while（vector1.size（）> 0）
 {
 highest = 0; 
 
 for（int i = 0; i  {
 
 if（vector1 [i] b $ b {
 highest = vector1 [i]; 
 int highestpos = i; 
} 
} 
 
 vector2.push_back（highest）; 
 vector1 [highestpos] = vector1 [vector1.size（） -  1]; 
 vector1 [vector1.size（） -  1] = highest; 
 vector1.pop_back（）; 
} 
  

解决方案

  int highestpos = i; 
  

你只是在循环中定义一个变量。它不会更改循环外部的变量的值。更改为：

  highestpos = i; 
  

I'm trying to remove the biggest int element in a vector and insert it into a new vector.I already have an int that represent the highest number in the vector and one that represents the position of that number.

Heres my code:

vector2.push_back(highest);
vector1[highestpos] = vector1[vector1.size()-1];
vector1[vector1.size()-1] = highest;
vector1.pop_back();

But it returns an error. Is there anything wrong with this code?

EDIT::::::HERE IS MORE OF MY CODE. The error I get is an assertion error that says vector subscript is out of range.

while(vector1.size() > 0)
{
highest = 0;

   for (int i = 0; i < vector1.size(); i++)
  {

      if (vector1[i] > highest)
       {
           highest = vector1[i];
           int highestpos = i;
       }
  }

      vector2.push_back(highest);
      vector1[highestpos] = vector1[vector1.size()-1];
      vector1[vector1.size()-1] = highest;
      vector1.pop_back();
}

解决方案

 int highestpos = i;

You're just defining a variable inside the loop. It doesn't change the value of the variable outside the loop. Change to:

 highestpos = i;

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