题解 | #Number Steps#

#include <iostream>

using namespace std;
//题目很坑，根本就没有n,只需输入x,y即可
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;
        }
    }
    return 0;
}