2220 - Minimum Bit Flips to Convert Number

 C++

• class Solution {
  public:
      int minBitFlips(int start, int goal) {
          return __builtin_popcount(start ^ goal);
      }
  };

JAVA

• class Solution {
      public int minBitFlips(int start, int goal) {
          int t = start ^ goal;
          int ans = 0;
          while (t != 0) {
              ans += t & 1;
              t >>= 1;
          }
          return ans;
      }
  }