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<pre>
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<strong>Input:</strong> nums = [2,1,4]
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<strong>Output:</strong> 141
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<strong>Explanation:</strong>
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<strong>Explanation:</strong>
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1<sup>st</sup> group: [2] has power = 2<sup>2</sup> * 2 = 8.
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2<sup>nd</sup> group: [1] has power = 1<sup>2</sup> * 1 = 1.
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3<sup>rd</sup> group: [4] has power = 4<sup>2</sup> * 4 = 64.
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4<sup>th</sup> group: [2,1] has power = 2<sup>2</sup> * 1 = 4.
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5<sup>th</sup> group: [2,4] has power = 4<sup>2</sup> * 2 = 32.
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6<sup>th</sup> group: [1,4] has power = 4<sup>2</sup> * 1 = 16.
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7<sup>th</sup> group: [2,1,4] has power = 4<sup>2</sup> * 1 = 16.
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2<sup>nd</sup> group: [1] has power = 1<sup>2</sup> * 1 = 1.
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3<sup>rd</sup> group: [4] has power = 4<sup>2</sup> * 4 = 64.
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4<sup>th</sup> group: [2,1] has power = 2<sup>2</sup> * 1 = 4.
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5<sup>th</sup> group: [2,4] has power = 4<sup>2</sup> * 2 = 32.
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6<sup>th</sup> group: [1,4] has power = 4<sup>2</sup> * 1 = 16.
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7<sup>th</sup> group: [2,1,4] has power = 4<sup>2</sup> * 1 = 16.
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The sum of powers of all groups is 8 + 1 + 64 + 4 + 32 + 16 + 16 = 141.
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</pre>
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