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    <p>I don't understand your code snippet -- it looks like all it does is read in the input file into a vector of strings, which will then contain each whitespace-delimited word in a separate string, then write it back out in 2 different ways (once with words separated by <code>\n</code>, once with them separated by spaces).</p> <p>It seems the main problem you're having is with reading and interpreting the file itself, as opposed to doing the necessary calculations -- right? That's what I hope this answer will help you with.</p> <p>I think the line structure of the file is important -- right? In that case you would be better off using the <a href="http://www.cplusplus.com/reference/string/getline/" rel="nofollow">global <code>getline()</code> function in the <code>&lt;string&gt;</code> header</a>, which reads an entire line (rather than a whitespace-delimited word) into a string. (Admittedly that function is pretty well-hidden!) Also you don't actually need to read all the lines into a vector, and then process them -- it's more efficient and actually easier to distill them down to numbers or bitsets as you go:</p> <pre><code>vector&lt;unsigned&gt; last, curr; // An unsigned can comfortably hold 0-15 ifstream inf("a.txt"); while (true) { string line; getline(inf, line); // This is the group header: ignore it while (getline(inf, line)) { if (line == "-") { break; } // This line contains a binary string: turn it into a number // We ignore all characters that are not binary digits unsigned val = 0; for (int i = 0; i &lt; line.size(); ++i) { if (line[i] == '0' || line[i] == '1') { val = (val &lt;&lt; 1) + line[i] - '0'; } } curr.push_back(val); } // Either we reached EOF, or we saw a "-". Either way, compare // the last 2 groups. compare_them_somehow(curr, last); // Not doing everything for you ;) last = curr; // Using swap() would be more efficient, but who cares curr.clear(); if (inf) { break; // Either the disk exploded, or we reached EOF, so we're done. } } </code></pre>
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