You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
This file contains ambiguous Unicode characters that may be confused with others in your current locale. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to highlight these characters.
# include <bits/stdc++.h>
using namespace std ;
const int N = 1000010 ;
const int INF = 0x3f3f3f3f ;
int g [ 150 ] [ 150 ] ;
int w [ N ] ; // 居民人口数，点权
int main ( ) {
int n ;
cin > > n ;
// 地图初始化
memset ( g , 0x3f , sizeof g ) ;
for ( int i = 1 ; i < = n ; i + + ) g [ i ] [ i ] = 0 ;
for ( int i = 1 ; i < = n ; i + + ) {
int a , b ;
cin > > w [ i ] > > a > > b ; // w[i]:点权
g [ i ] [ a ] = g [ a ] [ i ] = 1 ; // i<->a无向边
g [ i ] [ b ] = g [ b ] [ i ] = 1 ; // i<->b无向边
}
// floyd
for ( int k = 1 ; k < = n ; k + + )
for ( int i = 1 ; i < = n ; i + + )
for ( int j = 1 ; j < = n ; j + + )
if ( g [ i ] [ j ] > g [ i ] [ k ] + g [ k ] [ j ] ) g [ i ] [ j ] = g [ i ] [ k ] + g [ k ] [ j ] ;
int ans = INF ;
for ( int i = 1 ; i < = n ; i + + ) { // 如果将医院设置在i处，
int s = 0 ;
for ( int j = 1 ; j < = n ; j + + ) s + = w [ j ] * g [ i ] [ j ] ;
ans = min ( ans , s ) ;
}
printf ( " %d " , ans ) ;
return 0 ;
}
