Task: Ranking methods
C: #include<stdlib.h>
#include<stdio.h>

typedef struct{
	int score;
	char name[100];
}entry;

void ordinalRanking(entry* list,int len){
	
	int i;
	
	printf("\n\nOrdinal Ranking\n---------------");
	
	for(i=0;i<len;i++)
		printf("\n%d\t%d\t%s",i+1,list[i].score,list[i].name);
}

void standardRanking(entry* list,int len){
	
	int i,j=1;
	
	printf("\n\nStandard Ranking\n----------------");
	
	for(i=0;i<len;i++){
		printf("\n%d\t%d\t%s",j,list[i].score,list[i].name);
		if(list[i+1].score<list[i].score)
			j = i+2;
	}
}

void denseRanking(entry* list,int len){
	
	int i,j=1;
	
	printf("\n\nDense Ranking\n-------------");
	
	for(i=0;i<len;i++){
		printf("\n%d\t%d\t%s",j,list[i].score,list[i].name);
		if(list[i+1].score<list[i].score)
			j++;
	}
}

void modifiedRanking(entry* list,int len){
	
	int i,j,count;
	
	printf("\n\nModified Ranking\n----------------");
	
	for(i=0;i<len-1;i++){
		if(list[i].score!=list[i+1].score){
			printf("\n%d\t%d\t%s",i+1,list[i].score,list[i].name);
			count = 1;
			for(j=i+1;list[j].score==list[j+1].score && j<len-1;j++)
				count ++;
			for(j=0;j<count-1;j++)
				printf("\n%d\t%d\t%s",i+count+1,list[i+j+1].score,list[i+j+1].name);
			i += (count-1);
		}
	}
	printf("\n%d\t%d\t%s",len,list[len-1].score,list[len-1].name);
}

void fractionalRanking(entry* list,int len){
	
	int i,j,count;
	float sum = 0;
	
	printf("\n\nFractional Ranking\n------------------");
	
	for(i=0;i<len;i++){
		if(i==len-1 || list[i].score!=list[i+1].score)
			printf("\n%.1f\t%d\t%s",(float)(i+1),list[i].score,list[i].name);
		else if(list[i].score==list[i+1].score){
			sum = i;
			count = 1;
			for(j=i;list[j].score==list[j+1].score;j++){
				sum += (j+1);
				count ++;
			}
			for(j=0;j<count;j++)
				printf("\n%.1f\t%d\t%s",sum/count + 1,list[i+j].score,list[i+j].name);
			i += (count-1);
		}
	}
}

void processFile(char* fileName){
	FILE* fp = fopen(fileName,"r");
	entry* list;
	int i,num;
	
	fscanf(fp,"%d",&num);
	
	list = (entry*)malloc(num*sizeof(entry));
	
	for(i=0;i<num;i++)
		fscanf(fp,"%d%s",&list[i].score,list[i].name);
	
	fclose(fp);
	
	ordinalRanking(list,num);
	standardRanking(list,num);
	denseRanking(list,num);
	modifiedRanking(list,num);
	fractionalRanking(list,num);
}

int main(int argC,char* argV[])
{
	if(argC!=2)
		printf("Usage %s <score list file>");
	else
		processFile(argV[1]);
	return 0;
}

Python: def mc_rank(iterable, start=1):
    
    lastresult, fifo = None, []
    for n, item in enumerate(iterable, start-1):
        if item[0] == lastresult:
            fifo += [item]
        else:
            while fifo:
                yield n, fifo.pop(0)
            lastresult, fifo = item[0], fifo + [item]
    while fifo:
        yield n+1, fifo.pop(0)


def sc_rank(iterable, start=1):
    
    lastresult, lastrank = None, None
    for n, item in enumerate(iterable, start):
        if item[0] == lastresult:
            yield lastrank, item
        else:
            yield n, item
            lastresult, lastrank = item[0], n


def d_rank(iterable, start=1):
    
    lastresult, lastrank = None, start - 1,
    for item in iterable:
        if item[0] == lastresult:
            yield lastrank, item
        else:
            lastresult, lastrank = item[0], lastrank + 1
            yield lastrank, item


def o_rank(iterable, start=1):
    
    yield from enumerate(iterable, start)


def f_rank(iterable, start=1):
    
    last, fifo = None, []
    for n, item in enumerate(iterable, start):
        if item[0] != last:
            if fifo:
                mean = sum(f[0] for f in fifo) / len(fifo)
                while fifo:
                    yield mean, fifo.pop(0)[1]
        last = item[0]
        fifo.append((n, item))
    if fifo:
        mean = sum(f[0] for f in fifo) / len(fifo)
        while fifo:
            yield mean, fifo.pop(0)[1]


if __name__ == '__main__':
    scores = [(44, 'Solomon'),
              (42, 'Jason'),
              (42, 'Errol'),
              (41, 'Garry'),
              (41, 'Bernard'),
              (41, 'Barry'),
              (39, 'Stephen')]

    print('\nScores to be ranked (best first):')
    for s in scores:
        print('        %2i %s' % (s ))
    for ranker in [sc_rank, mc_rank, d_rank, o_rank, f_rank]:
        print('\n%s:' % ranker.__doc__)
        for rank, score in ranker(scores):
            print('  %3g, %r' % (rank, score))