range-based 'for' loops are not allowed in C++98 mode

使用for語句遍歷字符串出現的錯誤。解決辦法參考以下：c++ codeblock:https://blog.csdn.net/whl_program/article/details/69663613.net devc++:https://blog.csdn.net/qq_39696269/article/details/81024071code

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