[알고리즘] 백준 10093 - 숫자

#include <iostream>
using namespace std;

unsigned long long a, b;

int main(){
    cin >> a >> b; 
    if(a > b){
        unsigned long long tmp = b;	
        b = a;
        a = tmp;
    }
    if(a == b){
        cout << 0 << "\n";
    }
    else{
        cout << b - a - 1 << "\n";
        for(unsigned long long i=a+1; i<b; i++){
            if(i == b - 1){
                cout << i;
            }
            else{
                cout << i << " ";
            }
        }
    }
    return 0;
}