quick-union

#include <stdio.h>
#include <malloc.h>
#include <stdbool.h>
#include <string.h>

struct UnionFindSet
{
    int *ID;
    int GroupSum;
    int WeightOriginalTotal;
};

struct UnionFindSet* UnionFindSetInit(int WeightTotal)
{
    struct UnionFindSet *UFSet = malloc(sizeof(struct UnionFindSet));
    
    UFSet -> GroupSum = WeightTotal;
    UFSet -> WeightOriginalTotal = WeightTotal;
    
    UFSet -> ID = malloc(WeightTotal*sizeof(int));
    
    int i;
    for(i = 0;i < WeightTotal;i ++)
    {
        UFSet -> ID[i] = i;
    }
    
    return UFSet; 
}

int UnionFindSetFind(struct UnionFindSet* UFSet,int WeightNum)
{
    if(WeightNum>UFSet -> WeightOriginalTotal-1 || WeightNum<0)
    {
        return -1;
    }
    
    while(WeightNum != UFSet -> ID[WeightNum])
    {
        WeightNum = UFSet -> ID[WeightNum];
    }
    return WeightNum;
}

int UnionFindSetUnion(struct UnionFindSet* UFSet,int Weight_1,int Weight_2)
{
    int WeightRoot_1 = UnionFindSetFind(UFSet,Weight_1);
    int WeightRoot_2 = UnionFindSetFind(UFSet,Weight_2);
    
    if(WeightRoot_1 == -1 || WeightRoot_2 == -1)
    {
        return -1;
    }
    if(WeightRoot_1 == WeightRoot_2)
    {
        return 1;
    }
    
    UFSet -> ID[WeightRoot_1] = UFSet -> ID[WeightRoot_2];
    
    UFSet -> GroupSum --;
    return 0;
}

bool UnionFindSetIsConnected(struct UnionFindSet* UFSet,int Weight_1,int Weight_2)
{
    return (UnionFindSetFind(UFSet,Weight_1) == UnionFindSetFind(UFSet,Weight_2));
}

int main()
{
    int i;
    
    struct UnionFindSet *UFSet = UnionFindSetInit(10);
    UnionFindSetUnion(UFSet,4,3);
    for(i = 0;i < 10;i ++)
        printf("%d ",UFSet->ID[i]);
    printf("
");
    UnionFindSetUnion(UFSet,3,8);
    for(i = 0;i < 10;i ++)
        printf("%d ",UFSet->ID[i]);
    printf("
");
    UnionFindSetUnion(UFSet,6,5);
    for(i = 0;i < 10;i ++)
        printf("%d ",UFSet->ID[i]);
    printf("
");
    UnionFindSetUnion(UFSet,9,4);
    for(i = 0;i < 10;i ++)
        printf("%d ",UFSet->ID[i]);
    printf("
");
    UnionFindSetUnion(UFSet,2,1);
    for(i = 0;i < 10;i ++)
        printf("%d ",UFSet->ID[i]);
    printf("
");
    UnionFindSetUnion(UFSet,8,9);
    for(i = 0;i < 10;i ++)
        printf("%d ",UFSet->ID[i]);
    printf("
");
    UnionFindSetUnion(UFSet,5,0);
    for(i = 0;i < 10;i ++)
        printf("%d ",UFSet->ID[i]);
    printf("
");
    UnionFindSetUnion(UFSet,7,2);
    for(i = 0;i < 10;i ++)
        printf("%d ",UFSet->ID[i]);
    printf("
");
    UnionFindSetUnion(UFSet,6,1);
    for(i = 0;i < 10;i ++)
        printf("%d ",UFSet->ID[i]);
    printf("
");
    UnionFindSetUnion(UFSet,1,0);
    for(i = 0;i < 10;i ++)
        printf("%d ",UFSet->ID[i]);
    printf("
");
    UnionFindSetUnion(UFSet,6,7);
    for(i = 0;i < 10;i ++)
        printf("%d ",UFSet->ID[i]);
    printf("
");
    
    bool Result = UnionFindSetIsConnected(UFSet,0,1);
    printf("%d
",Result);
    return 0;
}