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"Let's look at the condition as: prices[indexes[i]] - indexes[i] == prices[indexes[j]] - indexes[j]
.",
"So now we define a new array named group
and is constructed as group[i] = prices[i] - i
.",
"A subarray of prices
is linear if they belong to the same group.",
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"So for each group, we calculate the sum of its prices and the answer would be the maximum sum over all groups."
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