Print the index of interval
if ( tup . get ( i - 1 ) . r < tup . get ( i ) . r ) System . out . print ( tup . get ( i - 1 ) . index + " ▁ " + tup . get ( i ) . index ) ; else System . out . print ( tup . get ( i ) . index + " ▁ " + tup . get ( i - 1 ) . index ) ; return ; }