lst-0111-godb.cpp
//#(compile) c++; compiler:g141; options:-O3 -std=c++23 -DNDEBUG; libs:-
// https://godbolt.org/z/hee331WGe
unordered_set nums{ 1,2,3,4,5,6,7,8,9,10 };
cout <<= nums; // Output similar to: 9 1 2 3 4 5 6 7 8 10
auto it = nums.begin();
while(it != nums.end()) {
if(*it % 2 == 0) { // even number?
it = nums.erase(it); // Remaining elements do not change order
} else {
++it;
}
}
cout <<= nums; // Output similar to: 9 1 3 5 7