PAT 乙级 1016 部分A+B

PAT 乙级 1016 部分A+B

https://pintia.cn/problem-sets/994805260223102976/problems/994805306310115328

#include <bits/stdc++.h>

using namespace std;

int cal(int x, int Dx) {
	int Px = 0;
	while (x != 0) {
		if (x % 10 == Dx) {
			Px = Px * 10 + x % 10;
		}
		x /= 10;
	}
	return Px;
}

int main() {

	int a, Da, b, Db;
	cin >> a >> Da >> b >> Db;
	int Pa = cal(a, Da);
	int Pb = cal(b, Db); 
	cout <<  Pa + Pb;

	return 0;
}