C++实现基于不相交集合的O(mlgn)复杂度的kruskal算法

int rank[505];
int father[505];
void make_set(int x)
{
	father[x]=x;
	rank[x]=0;
}
int find_set(int x)
{
    if (x!=father[x])
    {
        father[x]=find_set(father[x]);
    }
    return father[x];
}
void simply_union_set(int u,int v)
{
    u=find_set(u);
    v=find_set(v);
    father[u]=v;
}
void  perfect_union_set(int u,int v)
{
    u=find_set(u);
    v=find_set(v);
    if (rank[u]>rank[v])
    {
        father[v]=u;
    }
    else
    {
        father[u]=v;
        if(rank[u]==rank[v])
        rank[v]++;
    }

}

void kruskal()
{
    for(int i=0;i<num_v;i++)make_set(i);
    sort(arr_edge.begin(),arr_edge.end(),mycompare);
    for(int i=0;i<arr_edge.size();i++)
    {
        int fr=arr_edge[i].fr;
        int to=arr_edge[i].to;
        int w=arr_edge[i].w;
        if( find_set(fr)!=find_set(to))
        {
        	result+=w;
            perfect_union_set(fr,to);
        }
    }
}

#include<iostream>
#include<algorithm>
#include<cstring>
#include<cstdio>
#include<vector>
using namespace std;
#define INTMAX 0x3f3f3f3f
typedef pair<int,int> pii;
typedef long long ll;
#define x first
#define y second

int rank[505];
int father[505];
int find_set(int x)
{
    if (x!=father[x])
    {
        father[x]=find_set(father[x]);
    }
    return father[x];
}
void simply_union_set(int u,int v)
{
    u=find_set(u);
    v=find_set(v);
    father[u]=v;
}
void  perfect_union_set(int u,int v)
{
    u=find_set(u);
    v=find_set(v);
    if (rank[u]>rank[v])
    {
        father[v]=u;
    }
    else
    {
        father[u]=v;
        if(rank[u]==rank[v])
        rank[v]++;
    }

}
struct edge
{
    int fr,to,w;
};
int num_case,num_v,result;
vector<edge> arr_edge;

void debug()
{
    for(int i=0;i<arr_edge.size();i++)
    {
        cout<<arr_edge[i].fr<<" to "<<arr_edge[i].to<<"="<<arr_edge[i].w<<endl;
    }
}

void init()
{
    arr_edge.clear();
    result=0;
}
void input()
{
    int w;
    scanf("%d",&num_v);
    for(int i=0;i<num_v;i++)
    {
        for(int j=0;j<num_v;j++)
        {
            scanf("%d",&w);
            if(i<j)
            {
                edge temp;
                temp.fr=i;
                temp.to=j;
                temp.w=w;
                arr_edge.push_back(temp);
            }
        }
    }

}
bool mycompare(const edge& x,const edge &y)
{
    return x.w<y.w;
}
void kruskal()
{
    for(int i=0;i<num_v;i++)father[i]=i;
    sort(arr_edge.begin(),arr_edge.end(),mycompare);
    for(int i=0;i<arr_edge.size();i++)
    {
        int fr=arr_edge[i].fr;
        int to=arr_edge[i].to;
        int w=arr_edge[i].w;
        if( find_set(fr)!=find_set(to))
        {
            result=max(result,w);
            simply_union_set(fr,to);
        }
    }
}
void solve()
{
    init();
    input();
    //debug();
    kruskal();
    cout<<result<<endl;
}

int main()
{
    scanf("%d",&num_case);
    while(num_case--)
    {
        solve();
    }
    return 0;
}