Problem #42

This one was just a modification of the source code for a previous version.

#include <iostream>
#include <ctime>
#include <fstream>
#include <vector>
#include <algorithm>
#include <string>

using namespace std;

int sum (string);

int main() 
{
    clock_t start = clock();
    long int total = 0;
    char ch;
    ifstream fi;
    vector<string> v;
    bool table [100000];

    for (unsigned int i = 0; i < 100000; i++)
        table[i] = false;
    for (unsigned int i = 0; ; i++)
        if (static_cast<int>((1/static_cast<double> (2)) * static_cast<double> ((i + 1) * ((i + 1) + 1))) > 100000)
            break;
        else
            table[static_cast<int>((1/static_cast<double> (2)) * static_cast<double> ((i + 1) * ((i + 1) + 1)))] = true;

    fi.open ("words.txt");

    while (!fi.eof ())
    {
        v.resize (v.size () + 1);
        ch = fi.get ();
        while (ch != ',' && !fi.eof ())
        {
            v[v.size () - 1] += ch;
            ch = fi.get ();
        }
    }

    for (unsigned int i = 0; i < v.size (); i++)
        if (table[sum (v[i])] == true)
            total++;

    fi.close ();

    cout << total << endl 
         << "Process took " << (static_cast<double> (clock()) - start) / CLOCKS_PER_SEC << " seconds." << endl;

    system("pause");
    return 0;
}

int sum (string str)
{
    int total = 0;

    for (unsigned int i = 0; i < str.size (); i++)
        if (isalpha (str[i]))
            total += tolower (str[i]) - 96;

    return total;
}