Codeforces Round #228 (Div. 2) A. Fox and Number Game

#include <iostream>
#include <algorithm>
#include <vector>
#include <numeric>

using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> x(n,0);
    for(int i = 0 ; i <  n; ++ i ){
        cin >>  x[i];
    }
    bool  flag = true;
    while(flag){
        flag = false;
        sort(x.begin(),x.end());
        for(int i =  n - 1; i >=1; i -- ){
            if(x[i]-x[i-1] > 0){
                x[i]-=x[i-1];
                flag = true;
            }
        }
    }
    cout<<accumulate(x.begin(),x.end(),0)<<endl;
    return 0;
}