The Text Bot

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Roy frequently needs to use his old Nokia cell phone for texting. You may be already familiar with the working of the keypad, however if you're not we shall see a few examples. To type "b", we need to press "2" twice. To type "?" we need to press "1" thrice. To type "5" we need to press "5" four times. To type "0" we need to press "0" twice. I hope that it's clear how the keypad is being used.

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L1 Observation

L2 Technique

L3 Approach

L4 Pseudo-code

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L5 Full solution

L5 unlocks only if you insist twice

solution.cppC++17

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