[HIHO1039] Character elimination (string, enumeration, impersonation)

Title Link: http://hihocoder.com/problemset/problem/1039

Idea: Enumerate the location of all character updates and the ABC three modification scheme, then simulate the elimination rules, step-by-step to eliminate. Until it cannot be eliminated, update the answer by subtracting the current string length from the original string length. Actually wrote for a long time.

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[HIHO1039] Character elimination (string, enumeration, impersonation)