题解 | Number Steps

#include <bits/stdc++.h>
using namespace std;

int main(){
    int x,y;
    while(cin>>x>>y){
        if(x==y){
            if(x%2==0)cout<<x+y<<endl;
            else cout<<x+y-1<<endl;
        }else if(x-y==2){
            if(x%2==0)cout<<x+y<<endl;
            else cout<<x+y-1<<endl;
        }else cout<<"No Number"<<endl;
    }
}

题目输入有误，但是实际上本题逻辑非常简单