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 <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <cstdio>
#include <functional>
#include <numeric>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <utility>
#include <sstream>
#include <complex>

using namespace std;

#define FOR(i,a,b) for(long long i=(a);i<(b);i++)
#define REP(i,N) for(long long i=0;i<(N);i++)
#define ALL(s) (s).begin(),(s).end()
#define fi first
#define se second

#define PI acos(-1.0)
#define INF 1000000007
#define EPS 1e-10

typedef long long ll;
typedef pair<ll, ll> P;
typedef pair<double, double> PD;
typedef pair<string, ll> PS;
typedef vector<ll> V;
typedef pair<P, char> PC;


int dpt[111][111];
int dpc[111][111];
int n, m, a, b, cost, t, k, p, q, r;

int main(){
	while (cin >> n >> m&&n + m){
		REP(i, 111)REP(j, 111){
			if (i == j){
				dpt[i][j] = 0;
				dpc[i][j] = 0;
			}
			else{
				dpt[i][j] = INF;
				dpc[i][j] = INF;
			}
		}
		REP(i, n){
			cin >> a >> b >> cost >> t;
			dpt[a][b] = min(dpt[a][b], t);
			dpt[b][a] = min(dpt[a][b], t);
			dpc[a][b] = min(dpc[a][b], cost);
			dpc[b][a] = min(dpc[a][b], cost);
		}
		FOR(i, 1, m + 1){
			FOR(j, 1, m + 1){
				FOR(k, 1, m + 1){
					dpt[i][j] = min(dpt[i][j], dpt[i][k] + dpt[k][j]);
					dpc[i][j] = min(dpc[i][j], dpc[i][k] + dpc[k][j]);
				}
			}
		}
		cin >> k;
		REP(i, k){
			cin >> p >> q >> r;
			if (r == 0)cout << dpc[p][q] << endl;
			else cout << dpt[p][q] << endl;
		}
	}
}

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

int cost[101][101],t[101][101];
bool tf,cf;

int wf(int p,int q,int r,int m){
	if(r){
		if(tf){
			for(int k=1 ; k <= m ; ++k){
				for(int i=1 ; i <= m ; ++i){
					for(int j=1 ; j <= m ; ++j){
						if(t[i][j] > t[i][k] + t[k][j]) t[i][j] = t[i][k] + t[k][j];
					}
				}
			}
			tf = false;
			return t[p][q];
		}else return t[p][q];
	}else if(cf){
		for(int i=1 ; i <= m ; ++i){
			for(int j=1 ; j <= m ; ++j){
				for(int k=1 ; k <= m ; ++k){
					if(cost[i][j] > cost[i][k] + cost[k][j]) cost[i][j] = cost[i][k] + cost[k][j];
				}
			}
		}
		cf = false;
		return cost[p][q];
	}
	else return cost[p][q];
}

int main(){
	int a,b,c,d,n,m,k,p,q,r;
	
	while(cin >> n >> m && n && m){
		for(int i=1 ; i <= m ; ++i){
			for(int j=1 ; j <= m ; ++j){
				cost[i][j] = 10000;
				t[i][j] = 10000;
			}
		}
		cf = true;
		tf = true;
		for(int i=0 ; i < n ; ++i){
			cin >> a >> b >> c >> d;
			cost[a][b] = c;
			cost[b][a] = c;
			t[a][b] = d;
			t[b][a] = d;
		}
		cin >> k;
		for(int i=0 ; i < k ; ++i){
			cin >> p >> q >> r;
			cout << wf(p,q,r,m) << endl;
		}
		\
	}
	return 0;
}

C++: #include <iostream>
#include <algorithm>
#define MAX 2000
#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;
}