题解 | Number Steps

#include <iostream>
using namespace std;

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