如何随机分配到C ++中的向量？ [英] How to randomly assign to vector in C++?

问题描述

我是C ++的新手，并且不断被告知使用 std :: vector 而不是 new [] 。

I am new to C++, and am continuously told to use std::vector instead of new[].

我试图实现这个功能，在哪里我知道向量的大小，并要随机（不是顺序）分配。

I am trying to achieve this functionality, in where I know the size of the vector and want to assign to it randomly (not sequentially).

但是，当运行这个程序时，我的程序终止，没有错误输出，所以我很累。

However, when running this, my program terminates with no error output, so I am stumped.

vector<string> v1;
v1.resize(2);
v1.insert(v1.begin() + 1, "world");
v1.insert(v1.begin() + 0, "world");

cout << v1.at(1) << endl;

推荐答案

不要放弃， / p>

Don't give up, it's easier than that

vector<string> v1(2);
v1[1] = "world";
v1[0] = "world";

cout << v1[1] << endl;

vector :: insert 想要添加项目到你的向量，不是当你想要替换已经在那里， vector :: insert 改变矢量的大小换句话说，

vector::insert is for when you want to add items to your vector, Not when you want to replace ones that are already there, vector::insert changes the size of the vector in other words.

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