give integer array nums integer lower upper return number range sum lie low upper inclusiverange sum Si j define sum element num indice j inclusive j Example 1input num 251 low 2 upper 2output 3explanation the range 00 22 02 respective sum 2 1 2example 2input num 0 low 0 upper 0output 1 Constraints1 numslength 105231 numsi 231 1105 low upper 105the answer guarantee fit 32bit integer