fixed solution of [Medium] groupingOfNumbers problem #21
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Before fix
{0=[2], 1=[11, 19], 2=[23, 20], 3=[34, 33, 37], 5=[54, 59]}
After fix
{0=[2], 50=[54, 59], 20=[23, 20], 10=[11, 19], 30=[34, 33, 37]}