Check out example codes for "remove element from vector on condition c++". It will help you in understanding the concepts better.

Code Example 1

v.erase(std::remove_if(
    v.begin(), v.end(),
    [](const int& x) { 
        return x > 10; // put your condition here
    }), v.end());
// therefore elements > 10 are removed, leaving only elements<= 10

Code Example 2

#include <algorithm>
#include <vector>

// using the erase-remove idiom

std::vector<int> vec {2, 4, 6, 8};
int value = 8 // value to be removed
vec.erase(std::remove(vec.begin(), vec.end(), value), vec.end());

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