展开字符串
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 2123 Accepted Submission(s): 1019 Time Limit: 2000/1000 MS (Java/Others)
阅读背景：
展开字符串(dfs)
来源：互联网
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