static int findNumberOfTriangles ( int arr [ ] ) {
  int n = arr . length ;
  Arrays . sort ( arr ) ;
  int count = 0 ;
  for ( int i = 0 ;
  i < n - 2 ;
  ++ i ) {
    int k = i + 2 ;
    for ( int j = i + 1 ;
    j < n ;
    ++ j ) {
      while ( k < n && arr [ i ] + arr [ j ] > arr [ k ] ) ++ k ;
      if ( k > j ) count += k - j - 1 ;
    }
  }
  return count ;
}

static int findNumberOfTriangles ( int arr [ ] ) { int n = arr . length ; Arrays . sort ( arr ) ; int count = 0 ; for ( int i = 0 ; i < n - 2 ; ++ i ) { int k = i + 2 ; for ( int j = i + 1 ; j < n ; ++ j ) { while ( k < n && arr [ i ] + arr [ j ] > arr [ k ] ) ++ k ; if ( k > j ) count += k - j - 1 ; } } return count ; }
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