[EM] simulator code for VFA with poll

[Kevin Venzke]

Hi,

I post this on EM since I am not sure Brian Olson receives emails from 
me...

This is a simple attempt at VFA preceded by a poll. Essentially the
election is run once. Then all voters regard the result and move their
"for" vote (if necessary) to one of the top two non-disqualified
candidates. Since this results in a majority favorite, "against" votes
are not reconsidered.

I suppose that straight VFA will be a compromise between the FPP and
Condorcet results; VFA with poll should be closer to Condorcet but with
some monotonicity failures.

I hope there are no errors in this code. I hope it's of interest. I
like VFA because it's easy to count and behaves well with three 
candidates.

Kevin Venzke

void VFAWithPoll::runElection( int* winnerR, const VoterArray& they )
{
    int i;
    int* fptally; int* lptally;
    int winner; int winner2;
    int numc = they.numc; int numv = they.numv;
    fptally = new int[numc]; lptally = new int[numc];
    for ( i = 0; i < numc; i++ ) {
        fptally[i] = 0;
        lptally[i] = 0;
    }
    for ( i = 0; i < numv; i++ ) {
        fptally[they[i].getMax()]++;
        lptally[they[i].getMin()]++;
    }
    {   int m = 0; int n = 0;
        winner = 0; winner2 = 0;
        for ( i = 0; i < numc; i++ ) {
            if ( fptally[i] >= m && lptally[i]*2 <= numv ) {
                winner2 = winner; n = m;
                winner = i; m = fptally[i];
            } else if ( fptally[i] >= n && lptally[i]*2 <= numv ) {
                winner2 = i; n = fptally[i];
            }
        }
    }
    for ( i = 0; i < numc; i++ ) fptally[i] = 0;
    for ( i = 0; i < numv; i++ ) {
        if( they[i].getPref( winner ) >= they[i].getPref( winner2 ) )
            fptally[winner]++;
        else
            fptally[winner2]++;
    }
    if( fptally[winner2] > fptally[winner] ) winner = winner2;

    delete [] fptally;
    delete [] lptally;
    if ( winnerR ) *winnerR = winner;
}



	

	
		
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