OJ-Problems-Source/HDOJ/5102_autoAC.cpp

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#include <map>
#include <vector>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std ;
typedef long long LL ;
#define rep( i , a , b ) for ( int i = ( a ) ; i < ( b ) ; ++ i )
#define For( i , a , b ) for ( int i = ( a ) ; i <= ( b ) ; ++ i )
#define rev( i , a , b ) for ( int i = ( a ) ; i >= ( b ) ; -- i )
#define clr( a , x ) memset ( a , x , sizeof a )
const int MAXN = 100005 ;
const int MAXE = 200005 ;
struct Node {
int v , p , d ;
Node () {}
Node ( int v , int p , int d ) : v ( v ) , p ( p ) , d ( d ) {}
} ;
struct Edge {
int v , n ;
Edge () {}
Edge ( int v , int n ) : v ( v ) , n ( n ) {}
} ;
Node Q[3000005] ;
Edge E[MAXE] ;
int H[MAXN] , cntE ;
int head , tail ;
LL ans ;
int n , k ;
void clear () {
ans = 0 ;
cntE = 0 ;
clr ( H , -1 ) ;
}
void addedge ( int u , int v ) {
E[cntE] = Edge ( v , H[u] ) ;
H[u] = cntE ++ ;
}
void bfs () {
int cnt = 0 ;
head = tail = 0 ;
For ( i , 1 , n ) Q[tail ++] = Node ( i , 0 , 0 ) ;
while ( head != tail ) {
Node x = Q[head ++] ;
int u = x.v , p = x.p ;
for ( int i = H[u] ; ~i ; i = E[i].n ) {
int v = E[i].v ;
if ( v != p ) {
Q[tail ++] = Node ( v , u , x.d + 1 ) ;
ans += x.d + 1 ;
++ cnt ;
if ( cnt == k ) return ;
}
}
}
}
void solve () {
int u , v ;
clear () ;
scanf ( "%d%d" , &n , &k ) ;
k *= 2 ;
rep ( i , 1 , n ) {
scanf ( "%d%d" , &u , &v ) ;
addedge ( u , v ) ;
addedge ( v , u ) ;
}
bfs () ;
printf ( "%I64d\n" , ans / 2 ) ;
}
int main () {
int T ;
scanf ( "%d" , &T ) ;
while ( T -- ) solve () ;
return 0 ;
}