Go: package main

import (
	"bufio"
	"os"
	"strconv"
	"strings"
	"fmt"
	)

var scanner = bufio.NewScanner(os.Stdin)

const INF = 0x7FFFFFFF

func main() {
	for scanner.Scan() {
		n, _ := strconv.Atoi(scanner.Text())
		if n == 0 {
			break
		}
		matrix := make([][]int, 10)
		for i := range matrix {
			matrix[i] = make([]int, 10)
		}
		for i := range matrix {
			for j := range matrix[i] {
				if i == j {
					matrix[i][j] = 0
				} else {
					matrix[i][j] = INF
				}
			}
		}
		num := 0
		for i := 0; i < n; i++ {
			scanner.Scan()
			buf := strings.Split(scanner.Text(), " ")
			from, _ := strconv.Atoi(buf[0])
			to, _ := strconv.Atoi(buf[1])
			cost, _ := strconv.Atoi(buf[2])
			if num < from {
				num = from
			}
			if num < to {
				num = to
			}
			matrix[from][to] = cost
			matrix[to][from] = cost
		}
		num++
		for i := 0; i < num; i++ {
			for j := 0; j < num; j++ {
				for k := 0; k < num; k++ {
					if matrix[j][i]+matrix[i][k] < matrix[j][k] {
						matrix[j][k] = matrix[j][i]+matrix[i][k]
					}
				}
			}
		}
		ans, sum := 0, INF
		for i := 0; i < num; i++ {
			now := 0
			for j := 0; j < num; j++ {
				now += matrix[i][j]
			}
			if sum > now {
				sum = now
				ans = i
			}
		}
		fmt.Println(ans, sum)
	}
}

C++: #include <iostream>
#include <cctype>
#include <algorithm>
#include <vector>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <utility>
#include <string>
#include <functional>
#include <cctype>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <cmath>
using ll = long long;
const int INF = 100000000, mod = 1000000007;
const ll LLINF = 1LL << 50;
using namespace std;

int n, maxcity = 0, d[12][12], sum[12], ans = INF;

int main() {
    cin >> n;
    for (int i = 0; i <= 11; i++) {
        for (int j = 0; j <= 11; j++) {
            if (i == j)d[i][j] = 0;
            else d[i][j] = INF;
        }
    }
    for (int i = 0; i < n; i++) {
        int a, b, c;
        cin >> a >> b >> c;
        d[a][b] = c;
        d[b][a] = c;
        maxcity = max(maxcity, b);
    }
    for (int k = 0; k <= maxcity; k++) {
        for (int i = 0; i <= maxcity; i++) {
            for (int j = 0; j <= maxcity; j++) {
                d[i][j] = min(d[i][j], d[i][k] + d[k][j]);
            }
        }
    }
    for (int i = 0; i <= maxcity; i++) {
        for (int j = 0; j <= maxcity; j++) {
            sum[i] += d[i][j];
        }
    }
    for (int i = 0; i <= maxcity; i++) ans = min(ans, sum[i]);
    cout << ans << endl;
    return 0;
}

C++: #include <cstdio>
#include <cstring>
#include <climits>
#include <set>
#include <algorithm>
using namespace std;
typedef long long ll;
ll dist[10][10];
int main() {
    int n;
    while (scanf("%d",&n)!=EOF) {
        if (!n) break;
        for (int i=0; i<10; i++) for (int j=0; j<10; j++) {
            if (i==j) dist[i][j]=0;
            else dist[i][j]=INT_MAX;
        }
        set<int> town;
        int a, b, c;
        for (int i=0; i<n; i++) {
            scanf("%d%d%d",&a,&b,&c);
            dist[a][b]=c;
            dist[b][a]=c;
            town.insert(a); town.insert(b);
        }
        int sz=town.size();
        for (int k=0; k<sz; k++) {
            for (int i=0; i<sz; i++) {
                for (int j=0; j<sz; j++) {
                    dist[i][j]=min(dist[i][j],dist[i][k]+dist[k][j]);
                }
            }
        }
        int rpos, res=INT_MAX;
        for (int i=0; i<sz; i++) {
            int sum=0;
            for (int j=0; j<sz; j++) if (dist[i][j]!=INT_MAX) sum+=dist[i][j];
            if (sum<res) {
                rpos=i;
                res=sum;
            }
        }
        printf("%d %d\n",rpos,res);
    }
}

C++: #include <iostream>

// int inf = 1 << 28;
int inf = 1000000000;

int dijk(int n,int s, int **g) {
	int sum = 0;
	bool *used = new bool[n];
	int *d = new int[n];

	// std::cout << "n = " << n << " " << "s = " << s << std::endl;

/*
	for(int j=0;j<n;j++){
		for(int i=0;i<n;i++){
			std::cout << g[j][i] << ",";
		}
		std::cout << std::endl;
	}
*/

	for(int i = 0; i < n; i++)
		d[i] = inf;
	d[s] = 0;

	while(true) {
		int u = -1;
		for(int v = 0; v < n; v++)
			if(!used[v] && (u == -1 || d[v] < d[u]))
				u = v;

		// std::cout << "u = " << u << std::endl;

		if(u == -1) break;
		used[u] = true;

		for(int v = 0; v < n; v++)
			if(d[v] > d[u] + g[u][v])
				d[v] = d[u] + g[u][v];
	}

	for(int i = 0; i < n; i++) {
		sum += d[i];
	}

	// for(int i = 0; i < n; i++) {
	// std::cout << d[i] << std::endl;
	// }

	return sum;
}

int main() {
	do {
		int **g; // adjacency matrix, ?
		int *d;
		int *a, *b, *c;
		int edge = 0, min = 0, max = 0;
		int tmp = 0;

		std::cin >> edge;
		if(!edge) break;

		a = new int[edge];
		b = new int[edge];
		c = new int[edge];

		for(int i = 0;i < edge;i++) {
			std::cin >> a[i];
			std::cin >> b[i];
			std::cin >> c[i];
		}

		for(int i = 0; i < edge; i++) {
			if(max < a[i])
				max = a[i];
		}
		for(int i = 0; i < edge; i++) {
			if(max < b[i])
				max = b[i];
		}
		max++;

		g = new int*[max];
		d = new int[max];

		for(int i = 0; i < max; i++) {
			g[i] = new int[max];
		}

		for(int i = 0; i < max; i++)
			for(int j = 0; j < max; j++)
				g[i][j] = inf;

		for(int i = 0; i < edge; i++)
			g[b[i]][a[i]] = g[a[i]][b[i]] = c[i];

/*
		for(int i=0;i<max;i++){
			g[i][i]=0;
		}

		for(int k=0;k<max;k++){
			for(int j=0;j<max;j++){
				for(int i=0;i<max;i++){
					if(g[i][k]+g[k][j]<g[i][j]){
						g[i][j]=g[i][k]+g[k][j];
					}
				}
			}
		}
*/

		for(int i = 0; i < max; i++)
			d[i] = dijk(max, i, g);

/*
		for(int i = 0; i < max; i++){
			d[i]=0;
			for(int j=0;j<max;j++){
				d[i] += g[i][j];
			}
		}
*/

		min = d[0];
		for(int i = 1; i < max; i++) {
			if(min > d[i]) {
				min = d[i];
				tmp = i;
			}
		}

		std::cout << tmp << " " << min << std::endl;
		for(int i = 0; i < max; i++)
			delete[] g[i];
		delete[] g;
		delete[] a;
		delete[] b;
		delete[] c;
		delete[] d;

	}while(true);
	return 0;
}

C++: #include<iostream>
using namespace std;

int main(){
  int n;
  int a,b,c;
  int at[10][10];
  int cost,max,minn;
  long long int min;

  while(1){
    cin >> n;
    if(!n)break;

    for(int i=0;i<10;i++){
      for(int j=0;j<10;j++){
	if(i==j)at[i][j] = 0;
	else at[i][j] = -1;
      }
    }
    max = 0;
    for(int k=0;k<n;k++){
      cin >> a >> b >> c;
      if(max < a)max = a;
      if(max < b)max = b;
      for(int j=0;j<10;j++){
	if(at[j][a] >= 0){
	  if( (at[j][b] < 0) || ( at[j][a] + c < at[j][b]) ){
	    at[j][b] = c + at[j][a];
	    at[b][j] = c + at[j][a];
	  }
	}
	if(at[j][b] >= 0){
	  if( (at[j][a] < 0) || ( at[j][b] + c < at[j][a]) ){
	    at[j][a] = c + at[j][b];
	    at[a][j] = c + at[j][b];
	  }
	}
      }
    }

    min = 2000000000000000LL;
    for(int i=0;i<=max;i++){
      cost = 0;
      for(int j=0;j<=max;j++)cost += at[i][j];
      if(min > cost){
	min = cost;
	minn = i;
      }
    }
    cout << minn << " " << min << endl;
  }
}