comefrom: <qiyuangong>852_Peak_Index_in_a_Mountain_Array_1.java
code: public int peakIndexInMountainArray(int[] A) {
           int i = 0;
           for (; A[i] < A[i + 1]; i++);
           return i;
       }
masked: public int sample_funcname ( int [ ] var_0 ) {
    int var_2 = 0 ;
    for ( ;
    var_0 [ var_2 ] < var_0 [ var_2 + 1 ] ;
    var_2 ++ ) ;
    return var_2 ;
  }
  