comefrom: <qiyuangong>751_IP_to_CIDR_3.java
code: private int bitLength(long x) {
          if (x == 0) return 1;
          int ans = 0;
          while (x > 0) {
              x >>= 1;
              ans++;
          }
          return ans;
      }
masked: private int sample_funcname ( long var_0 ) {
    if ( var_0 == 0 ) return 1 ;
    int var_3 = 0 ;
    while ( var_0 > 0 ) {
      var_0 >>= 1 ;
      var_3 ++ ;
    }
    return var_3 ;
  }
  