itsa基 23 找零錢問題

#include <iostream>
#include<string>
#include<sstream>
using namespace std;

void replaceD(string &str)
{
int i = 0;
while (i < str.length())
{
if (str[i] == ',')
str[i] = ' ';
i++;
}
}

int main()
{
string str;
int N,a1,a2,a3,cost,x,y,z;
N = a1 = a2 = a3 = cost = 0;
getline(cin,str);
replaceD(str);
stringstream ss(str);
ss >> N >> a1 >> a2 >> a3;
cost = a1 * 15 + a2 * 20 + a3 * 30;
z = (N - cost) / 50;
y = ((N - cost) % 50) / 5;
x = ((N - cost) % 50) % 5;
if (cost > N)
{
cout << "0" << endl;
}
else
{
cout << x << "," << y << "," << z << endl;
}
return 0;
}