202. Decode String
MediumStackParsing
Decode strings like 3[a2[c]] → accaccacc: k[s] means s repeated k times. Brackets can be nested.
Input format
A single encoded line.
Output format
The decoded string.
Example 1
Input
3[a]2[bc]
Output
aaabcbc
Example 2
Input
3[a2[c]]
Output
accaccacc
Constraints
Decoded length ≤ 10⁵
Read input from standard input and print the answer to standard output. Your code is judged against 5 test cases, most of them hidden.
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