Vector out of range

[linkedlist771]

Hi Grimy,
I found a error when I used your multi-thread combination for the vector array of int, here is my code.

`

std::vector<std::vector<int>> res; 

const std::vector<int>& v = { 1,2,2,34 };

res = C_With_Multithreading(v);

res;

`
However , once I compile and run the code , the IDE(VS 2022) told me that , the subscript of the vector is out range . While I am
not familiar with the multi-thread , I have no idea about how to debug .