Remove C Functions
cstring :
memset -> std::fill
memcpy -> std::copy
memcmp -> std::equal
cstdio :
printf -> std::cout
scanf -> std::cin, std::getline, std::stringstream
cstdlib :
rand, srand -> random
strlen, strcpy... -> due to char* instead of string
atoi, atof, atoll.... -> stringstream or use boost
.......
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