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countOnes
Given a non-negative int n, return the number of its digits that are equal to 1 recursively (no loops). Note that mod (%) by 10 yields the rightmost digit (126 % 10 is 6), while divide (/) by 10 removes the rightmost digit (126 / 10 is 12). countOnes(121) → 2 countOnes(49) → 0 countOnes(12181) → 3 ...Save, Compile, Run (ctrl-enter) |
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