niubniubnibubinubnibunibubnibubi bubinbuinbubnib 用if(input.length()==n){
input变成stringbuilder类型,然后倒转,之后变回string然后输出
input变成stringbuilder类型,然后倒转,之后变回string然后输出
我已经通过这道题!
https://gw-c.nowcoder.com/api/sparta/jump/link?link=https%3A%2F%2Fwww.nowcoder.com%2FquestionTerminal%2F35f6f4e9173943e3b3f462b697fefd8b
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