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;
}


C++: #include <algorithm>
#include <iomanip>
#include <iostream>
#include <map>
#include <ostream>
#include <set>
#include <vector>

template<typename T>
std::ostream& print(std::ostream& os, const T& src) {
    auto it = src.cbegin();
    auto end = src.cend();

    os << "[";
    if (it != end) {
        os << *it;
        it = std::next(it);
    }
    while (it != end) {
        os << ", " << *it;
        it = std::next(it);
    }

    return os << "]";
}

typedef std::map<std::string, int> Map;
typedef Map::value_type MapEntry;

void standardRank(const Map& scores) {
    std::cout << "Standard Rank" << std::endl;

    std::vector<int> list;
    for (auto& elem : scores) {
        list.push_back(elem.second);
    }
    std::sort(list.begin(), list.end(), std::greater<int>{});
    list.erase(std::unique(list.begin(), list.end()), list.end());

    int rank = 1;
    for (auto value : list) {
        int temp = rank;
        for (auto& e : scores) {
            if (e.second == value) {
                std::cout << temp << " " << value << " " << e.first.c_str() << std::endl;
                rank++;
            }
        }
    }

    std::cout << std::endl;
}

void modifiedRank(const Map& scores) {
    std::cout << "Modified Rank" << std::endl;

    std::vector<int> list;
    for (auto& elem : scores) {
        list.push_back(elem.second);
    }
    std::sort(list.begin(), list.end(), std::greater<int>{});
    list.erase(std::unique(list.begin(), list.end()), list.end());

    int rank = 0;
    for (auto value : list) {
        rank += std::count_if(scores.begin(), scores.end(), [value](const MapEntry& e) { return e.second == value; });
        for (auto& e : scores) {
            if (e.second == value) {
                std::cout << rank << " " << value << " " << e.first.c_str() << std::endl;
            }
        }
    }

    std::cout << std::endl;
}

void denseRank(const Map& scores) {
    std::cout << "Dense Rank" << std::endl;

    std::vector<int> list;
    for (auto& elem : scores) {
        list.push_back(elem.second);
    }
    std::sort(list.begin(), list.end(), std::greater<int>{});
    list.erase(std::unique(list.begin(), list.end()), list.end());

    int rank = 1;
    for (auto value : list) {
        for (auto& e : scores) {
            if (e.second == value) {
                std::cout << rank << " " << value << " " << e.first.c_str() << std::endl;
            }
        }
        rank++;
    }

    std::cout << std::endl;
}

void ordinalRank(const Map& scores) {
    std::cout << "Ordinal Rank" << std::endl;

    std::vector<int> list;
    for (auto& elem : scores) {
        list.push_back(elem.second);
    }
    std::sort(list.begin(), list.end(), std::greater<int>{});
    list.erase(std::unique(list.begin(), list.end()), list.end());

    int rank = 1;
    for (auto value : list) {
        for (auto& e : scores) {
            if (e.second == value) {
                std::cout << rank++ << " " << value << " " << e.first.c_str() << std::endl;
            }
        }
    }

    std::cout << std::endl;
}

void fractionalRank(const Map& scores) {
    std::cout << "Ordinal Rank" << std::endl;

    std::vector<int> list;
    for (auto& elem : scores) {
        list.push_back(elem.second);
    }
    std::sort(list.begin(), list.end(), std::greater<int>{});
    list.erase(std::unique(list.begin(), list.end()), list.end());

    int rank = 0;
    for (auto value : list) {
        double avg = 0.0;
        int cnt = 0;

        for (auto& e : scores) {
            if (e.second == value) {
                rank++;
                cnt++;
                avg += rank;
            }
        }
        avg /= cnt;

        for (auto& e : scores) {
            if (e.second == value) {
                std::cout << std::setprecision(1) << std::fixed << avg << " " << value << " " << e.first.c_str() << std::endl;
            }
        }
    }

    std::cout << std::endl;
}

int main() {
    using namespace std;

    map<string, int> scores{
        {"Solomon", 44},
        {"Jason", 42},
        {"Errol", 42},
        {"Gary", 41},
        {"Bernard", 41},
        {"Barry", 41},
        {"Stephen", 39}
    };

    standardRank(scores);
    modifiedRank(scores);
    denseRank(scores);
    ordinalRank(scores);
    fractionalRank(scores);

    return 0;
}