LeetCode Solutions
class Solution {
public:
string strWithout3a3b(int A, int B, char a = 'a', char b = 'b') {
if (A < B)
return strWithout3a3b(B, A, b, a);
if (B == 0)
return string(min(A, 2), a);
const int useA = min(A, 2);
const int useB = (A - useA >= B) ? 1 : 0;
return string(useA, a) + string(useB, b) +
strWithout3a3b(A - useA, B - useB, a, b);
}
};