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#include<cstdio>
#include<vector>
#include<string>
#include<unordered_map>
char *first_unique_character(const std::string& str)
{
char *buffer = new char[39];
std::vector<char> chars{str.begin(), str.end()};
std::unordered_map<char, unsigned> hash{};
for(const char& c : str) hash[c]++;
for(std::size_t i = 0; i < chars.size(); ++i)
if(hash[chars[i]] == 1)
{
std::snprintf(buffer,
39,
"%zu as '%c' is the first unique character",
i,
chars[i]);
break;
}
return buffer;
}
int main(int argc, char *argv[])
{
if(argc < 2)
{
fprintf(stderr, "No arg(s) provided!");
exit(1);
}
char *buffer = first_unique_character(argv[1]);
printf("%s\n", buffer);
delete buffer;
return 0;
}
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