PAT basic 1006

#include<iostream>using namespace std;int main(){    int a;    cin >> a;    int b[3] = {0};    b[0] = a % 10;    b[1] = a / 10 % 10;    b[2] = a / 100;    for(int k = 0;k < b[2]; k++)    cout << "B";     for (int k = 0; k < b[1]; k++)        cout << "S";    for (int k = 0; k < b[0]; k++)        cout << k + 1;    return 0;}