【經典】942.DI String Match【排序的變種：按規則排序】

題目 Given a string S that only contains "I" (increase) or "D" (decrease), let N = S.length.java Return any permutation A of [0, 1, ..., N] such that for all i = 0, ..., N-1:數組 If S[i] == "I", then A[i]

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