Код: Выделить всё
class Solution {
public:
int removeDuplicates(vector& nums) {
//use set. As in set, element appears only once.
set s;
for(int i=0; i
Подробнее здесь: [url]https://stackoverflow.com/questions/75849886/type-setint-does-not-provide-a-subscript-operator[/url]