(Challenge) Interleaving Strings

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Chef has $N$ decimal strings $S_1, S_2, \ldots, S_N$ with him (that is, each of these strings contains only characters '0' through '9'). The characters in all strings are indexed starting from $1$. Chef wants to form a single long string $W$ by *interleaving* all these strings. A string $W$ is said to be formed by interleaving $S_1, S_2, \ldots, S_N$ if the characters of $W$ can be partitioned

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solution.cppC++17

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