comefrom: <awangdev>210. Course Schedule II_2.java
code: private List[] buildInDegreeEdges(int numCourses, int[][] prerequisites) {
  
          List[] inDegreeEdges = new ArrayList[numCourses];
          for (int i = 0; i < numCourses; i++) inDegreeEdges[i] = new ArrayList<Integer>();
          
          for (int[] prerequisite : prerequisites) inDegreeEdges[prerequisite[1]].add(prerequisite[0]);
          return inDegreeEdges;
      }
masked: private List [ ] var_0 ( int var_1 , int [ ] [ ] var_2 ) {
    List [ ] var_5 = new ArrayList [ var_1 ] ;
    for ( int var_7 = 0 ;
    var_7 < var_1 ;
    var_7 ++ ) var_5 [ var_7 ] = new ArrayList < Integer > ( ) ;
    for ( int [ ] var_9 : var_2 ) var_5 [ var_9 [ 1 ] ] . add ( var_9 [ 0 ] ) ;
    return var_5 ;
  }
  