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public static int[] radixSort(int[] inputs,int d){

for (int i = 1; i <= d; ++i)
inputs = countingSortForRadixSort(inputs, i);

return inputs;
}

private static int[] countingSortForRadixSort(int[] inputs,int digit){

int[] outputs = new int[inputs.length];
int[] middles = new int[10];

for (int i = 0; i < inputs.length ; ++i)
++middles[getDigitNumber(inputs[i],digit)];

for (int i = 1; i < middles.length; ++i)
middles[i] += middles[i-1];

for (int i = inputs.length-1; i >= 0; --i)
outputs[--middles[getDigitNumber(inputs[i],digit)]] = inputs[i];

return outputs;
}

private static int getDigitNumber(int no,int digit){

if (digit <= 0)
throw new IllegalArgumentException("digit can not be negitive or zero!");

return (int)((no/Math.pow(10,digit-1))%10);
}


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