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Finding all possible substring of a given string,sorted in lexicographical order 2 kartik 5 months

You have given a string. WAP to find all substrings sorted in lexicographical order in efficient way

format transformation 1 geek4u 11 months

How to write the function of
"transforming double to string, transforming string to double, transforming unicode to char, and transforming char to unicode " in C++?