BZOJ1083_繁忙的都市_KEY

题目传送门

裸的最小生成树。

code:

/**************************************************************
    Problem: 1083
    User: yekehe
    Language: C++
    Result: Accepted
    Time:24 ms
    Memory:2012 kb
****************************************************************/
 
#include <cstdio>
#include <algorithm>
using namespace std;
 
char tc()
{
    static char fl[100000],*A=fl,*B=fl;
    return A==B&&(B=(A=fl)+fread(fl,1,100000,stdin),A==B)?EOF:*A++;
}
 
int read()
{
    char c;while(c=tc(),(c<'0'||c>'9')&&c!='-');
    int x=0,y=1;c=='-'?y=-1:x=c-'0';
    while(c=tc(),c>='0'&&c<='9')x=x*10+c-'0';
    return x*y;
}
 
const int MAXN=305;
 
int N,M,a[MAXN],fa[MAXN],ans;
struct node{
    int x,y,c;
}L[MAXN*MAXN];
int cmp(node x,node y){return x.c<y.c;}
int getf(int x){return x==fa[x]?x:fa[x]=getf(fa[x]);}
 
int main()
{
//  freopen("x.txt","r",stdin);
    N=read(),M=read();
        for(int i=1;i<=M;i++)L[i].x=read(),L[i].y=read(),L[i].c=read();
    sort(L+1,L+M+1,cmp);
        for(int i=1;i<=N;i++)fa[i]=i;
        for(int i=1;i<=M;i++){
            int x=getf(L[i].x),y=getf(L[i].y),c=L[i].c;
            if(x!=y){
                fa[x]=y;
                ans=c;
            }
        }
    printf("%d %d",N-1,ans);
    return 0;
}