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First Non-repeated Character (CodeEval)
/* First Non-repeated Character Moderate Challenge on CodeEval */
/* Comiple this with the -std=c++11 flag to prevent warnings */
#include <iostream>
#include <fstream>
#include <string>
#include <map>
struct Double
{
int val[2]; // { count, order }
};
char get_letter(std::map<char, Double> letter_map, int string_length)
/* The list part of the map contains <count, order-found> */
{
char result;
int minimum = string_length;
for (std::map<char, Double>::iterator it = letter_map.begin(); it != letter_map.end(); ++it)
{
if (it->second.val[0] < 2 && it->second.val[1] < minimum)
{
result = it->first;
minimum = (minimum > it->second.val[1]) ? it->second.val[1] : minimum;
}
}
return result;
}
int main(int argc, char *argv[])
{
Double info;
std::ifstream stream(argv[1]);
std::string line;
std::map<char, Double> characters; // the map
while (getline(stream, line))
{
// Do something with the line
int length = line.length();
int count = 1;
for (int i = 0; i < length; i++)
{
if (characters.count(line[i]) == 0)
{
info = {1,i};
characters.insert(std::pair<char, Double>(line[i], info));
} else
{
count +=1;
std::map<char, Double>::iterator it = characters.find(line[i]);
if (it != characters.end())
{
it->second.val[0] = count;
}
}
}
std::cout<<get_letter(characters, length)<<std::endl;
characters.clear();
}
return 0;
}
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