Distinct - a920604a/leetcode GitHub Wiki

// you can use includes, for example:
// #include <algorithm>

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;

#include<unordered_set>
int solution(vector<int> &A) {
    // write your code in C++14 (g++ 6.2.0)
    unordered_set<int> s;
    for(int a:A) s.insert(a);
    return s.size();
}