comparison between signed and unsigned integer expression s [-Werror=sign-compare]

comparison between signed and unsigned integer expression s [-Werror=sign-compare]
ret[i].Id 是unsigned int 型，min_index是int，不能直接比较

但将min_index直接定义为unsigned 类型，-1是有符号的，在min_index == -1又是同样的错误，因此直接将比较中的-1也强制转为unsigned类型，如下图
comparison between signed and unsigned integer expression s [-Werror=sign-compare]

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