K - The Unique MST

K - The Unique MST

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
struct nond{
    int x,y,z;
}edge[*];
int T,N,M,x,y,z,fa[],num,ans[];
int tot,bns,k,answer=;
int cmp(nond aa,nond bb){
    return aa.z<bb.z;
}
int find(int x){
    return fa[x]==x?x:fa[x]=find(fa[x]);
}
int main(){
    cin>>T;
    while(T--){
        cin>>N>>M;
        tot=;bns=;
        answer=;
        memset(fa,,sizeof(fa));
        memset(ans,,sizeof(ans));
        for(int i=;i<=M;i++){
            cin>>x>>y>>z;
            edge[i].x=x;
            edge[i].y=y;
            edge[i].z=z;
        }
        sort(edge+,edge++M,cmp);
        for(int i=;i<=N;i++)    fa[i]=i;
        for(int i=;i<=M;i++){
            int dx=find(edge[i].x),dy=find(edge[i].y);
            if(dx!=dy){
                fa[dx]=dy;
                tot++;
                ans[tot]=i;
                bns+=edge[i].z;
            }
            if(tot==N-)    break;
        }
        for(int i=;i<=tot;i++){
            k=;num=;
            for(int j=;j<=N;j++)    fa[j]=j;
            sort(edge+,edge++M,cmp);
            for(int j=;j<=M;j++){
                if(j==ans[i])    continue;
                int dx=find(edge[j].x),dy=find(edge[j].y);
                if(dx!=dy){
                    fa[dx]=dy;
                    num++;
                    k+=edge[j].z;
                }
                if(num==N-)    break;
            }
            if(num==N-) answer=min(k,answer);
        }
        if(answer==bns)    cout<<"Not Unique!"<<endl;
        else    cout<<bns<<endl;
    }
}