Go: // Warshall–Floyd Algorithm

package main

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

var scanner = bufio.NewScanner(os.Stdin)

const INF = 0x7FFFFFFF

func main() {
	for scanner.Scan() {
		buf := strings.Split(scanner.Text(), " ")
		n, _ := strconv.Atoi(buf[0])
		m, _ := strconv.Atoi(buf[1])
		if n == 0 && m == 0 {
			break
		}
		c_matrix := make([][]int, m)
		for i := range c_matrix {
			c_matrix[i] = make([]int, m)
		}
		t_matrix := make([][]int, m)
		for i := range t_matrix {
			t_matrix[i] = make([]int, m)
		}
		for i := 0; i < n; i++ {
			scanner.Scan()
			buf_ := strings.Split(scanner.Text(), " ")
			a, _ := strconv.Atoi(buf_[0])
			b, _ := strconv.Atoi(buf_[1])
			c, _ := strconv.Atoi(buf_[2])
			t, _ := strconv.Atoi(buf_[3])
			c_matrix[a-1][b-1] = c
			t_matrix[a-1][b-1] = t
		}
		c_dist := make([][]int, m)
		c_prev := make([][]int, m)
		t_dist := make([][]int, m)
		t_prev := make([][]int, m)
		for i := 0; i < m; i++ {
			c_dist[i] = make([]int, m)
			c_prev[i] = make([]int, m)
			t_dist[i] = make([]int, m)
			t_prev[i] = make([]int, m)
		}
		for i := 0; i < m; i++ {
			for j := 0; j < m; j++ {
				if c_matrix[i][j] == 0{
					c_dist[i][j] = INF
				} else {
					c_dist[i][j] = c_matrix[i][j]
				}
				if c_matrix[i][j] == 0{
					c_prev[i][j] = -1
				} else {
					c_prev[i][j] = i
				}
				if t_matrix[i][j] == 0{
					t_dist[i][j] = INF
				} else {
					t_dist[i][j] = t_matrix[i][j]
				}
				if t_matrix[i][j] == 0{
					t_prev[i][j] = -1
				} else {
					t_prev[i][j] = i
				}
			}
			c_dist[i][i] = 0
			t_dist[i][i] = 0
		}
		for k := 0; k < m; k++ {
			for i := 0; i < m; i++ {
				for j := 0; j < m; j++ {
					c_newlen := c_dist[i][k] + c_dist[k][j]
					t_newlen := t_dist[i][k] + t_dist[k][j]
					if c_newlen < c_dist[i][j] {
						c_dist[i][j] = c_newlen
						c_prev[i][j] = c_prev[k][j]
					}
					if t_newlen < t_dist[i][j] {
						t_dist[i][j] = t_newlen
						t_prev[i][j] = t_prev[k][j]
					}
				}
			}
		}
		scanner.Scan()
		k, _ := strconv.Atoi(scanner.Text())
		for i := 0; i < k; i++ {
			scanner.Scan()
			buf_ := strings.Split(scanner.Text(), " ")
			p, _ := strconv.Atoi(buf_[0])
			q, _ := strconv.Atoi(buf_[1])
			r, _ := strconv.Atoi(buf_[2])
			switch r {
			case 0: fmt.Println(c_dist[p-1][q-1])
			case 1: fmt.Println(t_dist[p-1][q-1])
			}
		}
	}
}

C++: #include <iostream>
#include <algorithm>
#define MAX 3000
#define INF 999999

using namespace std;

int COST[MAX + 1][MAX + 1];
int TIME[MAX + 1][MAX + 1];
int v[MAX + 1];
bool visit[MAX + 1];
int n,m,k,p,q,r,ti,co;
int from,too;
int MI,mi;

int get_time(void){ // ダイクストラ法

  for( int i = 0 ; i <= MAX ; i++ ){ // 初期化
    visit[i] = false;
    v[i] = INF;
  }


  v[p] = 0; // 最初の位置を0にする

  while(1){

    MI = INF;

    for( int i = 1 ; i <= m ; i++ ){ // 訪れていない最小の添字を探す
      if( !visit[i] && v[i] < MI ){
	MI = i;
	mi = v[i];
      }
    }

    if( MI == INF ) break;
    visit[MI] = true; // 訪れたことにする

    for( int i = 1 ; i <= m ; i++ ){
      if( TIME[MI][i] + v[MI] < v[i] ){
	v[i] = TIME[MI][i] + v[MI];
      }
    }
  }
  return v[q];
}

int get_cost(void){

  for( int i = 0 ; i <= MAX ; i++ ){
    v[i] = INF;
    visit[i] = false;
  }

  v[p] = 0; 

  while(1){

    MI = INF;
    for( int i = 1 ; i <= m ; i++ ){
      if( !visit[i] && v[i] < MI ){
	MI = i;
	mi = v[i];
      }
    }

    if( MI == INF ) break;
    visit[MI] = true;

    for( int i = 1 ; i <= m ; i++ ){
      if( COST[MI][i] + v[MI] < v[i] ){
	v[i] = COST[MI][i] + v[MI];
      }
    }
  }
  return v[q];
}



int main(void){

  while( cin >> n >> m , n || m ){

    for( int i = 0 ; i <= MAX ; i++ ){
      for( int j = 0 ; j <= MAX ; j++ ){
	TIME[i][j] = INF;
	COST[i][j] = INF;
      }
    }

    for( int i = 0 ; i < n ; i++ ){
      cin >> from >> too >> co >> ti;
      COST[from][too] = COST[too][from] = co;
      TIME[from][too] = TIME[too][from] = ti;
    }

    cin >> k; // 問い合わせの数

    for( int i = 0 ; i < k ; i++ ){
      cin >> p >> q >> r;

      switch(r){
      case 0: // 最小金額
	cout << get_cost() << endl;
	break;
      case 1: // 最小時間
	cout << get_time() << endl;
      }

    }

  }
  return 0;
}

C++: #include <iostream>
#include <algorithm>
using namespace std;
int main(){
  int n,m;
  int a,b,c,d;
  int x;
  int p,q,r;
  int cost[111][111];
  int time[111][111];
  while(1){
    cin >> n >> m;
    if(n==0 && m==0)break;
    for(int i=0;i<111;i++){
      for(int j=0;j<111;j++){
	cost[i][j]=9999999;
	time[i][j]=9999999;
      }
    }
    for(int i=0;i<n;i++){
      cin >> a >> b >> c >> d;
      cost[a][b]=cost[b][a]=c;
      time[a][b]=time[b][a]=d;
    }
    for(int k=0;k<n;k++){
      for(int i=0;i<n;i++){
	for(int j=0;j<n;j++){
	  cost[i][j]=min(cost[i][j],cost[i][k]+cost[k][j]);
	  time[i][j]=min(time[i][j],time[i][k]+time[k][j]);
	}
      }
    }
    cin >> x;
    for(int i=0;i<x;i++){
      cin >> p >> q >> r;
      cout << (r==0 ? cost[p][q] : time[p][q]) << endl;
    }
  }
}

C++: #include <iostream>
const int MAX_E = 300, MAX_V = 100, INF = 1000000;
struct edge{int from, to, time, cost;};

edge es[MAX_E];
int d[MAX_V+1];
int n, m, k;

//0: time 1: cost
int minimum_value(int type, int start, int end){
	for(int i=0;i<MAX_V;i++)d[i] = INF;
	d[start] = 0;

	int res = 0;
	while(true){
		bool update = false;
		for(int i=0;i<n;i++){
			edge e = es[i];
			int cost = type?e.cost:e.time;
			if(d[e.from] != INF && d[e.to] > d[e.from] + cost){
				d[e.to] = d[e.from] + cost;
				res = d[e.to];
				update = true;
			}		
		}
		if(!update)break;
	}

	return res;
}

int main(){
	while(std::cin >> n >> m, n){
		for(int i=0;i<n;i++){
			int from, to, time, cost;
			std::cin >> from >> to >> time >> cost;
			edge e;
			e.from = from, e.to = to, e.time = time, e.cost = cost;
			es[i] = e;
		}

		std::cin >> k;
		for(int j=0;j<k;j++){
			int start, end, type;
			std::cin >> start >> end >> type;
			std::cout << minimum_value(type, start, end) << std::endl;
		}
	}

	return 0;
}

C++: #include <cstdio>
#include <cstring>
#include <algorithm>
#include <string>
#include <cmath>
#include <stack>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <list>
#include <iostream>
#include <sstream>
#include <climits>
#include <cfloat>
#include <complex>

using namespace std;

int main()
{
	int n, m;
	while (scanf("%d %d", &n, &m), n | m)
	{
		int d[2][101][101];
		for (int i = 0; i <= m; ++i)
			for (int j = 0; j <= m; ++j)
				d[0][i][j] = d[1][i][j] = 100000000;
		for (int i = 0; i <= m; ++i)
			d[0][i][i] = d[1][i][i] = 0;

		for (int i = 0; i < n; ++i)
		{
			int a, b, cost, time;
			scanf("%d %d %d %d", &a, &b, &cost, &time);
			d[0][a][b] = d[0][b][a] = cost;
			d[1][a][b] = d[1][a][b] = time;
		}
		for (int k = 0; k <= m; ++k)
			for (int i = 0; i <= m; ++i)
				for (int j = 0; j <= m; ++j)
					for (int l = 0; l < 2; ++l)
						d[l][i][j] = min(d[l][i][j], d[l][i][k] + d[l][k][j]);

		int queries;
		scanf("%d", &queries);
		for (int i = 0; i < queries; ++i)
		{
			int p, q, r;
			scanf("%d %d %d", &p, &q, &r);
			printf("%d\n", d[r][p][q]);
		}
	}

	return 0;
}