Go: // Warshall–Floyd Algorithm

package main

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

var scanner = bufio.NewScanner(os.Stdin)

const INF = 2000000000

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
			c_matrix[b-1][a-1] = c
			t_matrix[a-1][b-1] = t
			t_matrix[b-1][a-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
					c_prev[i][j] = -1
				} else {
					c_dist[i][j] = c_matrix[i][j]
					c_prev[i][j] = i
				}
				if t_matrix[i][j] == 0 {
					t_dist[i][j] = INF
					t_prev[i][j] = -1
				} else {
					t_dist[i][j] = t_matrix[i][j]
					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]
					if c_newlen < c_dist[i][j] {
						c_dist[i][j] = c_newlen
						c_prev[i][j] = c_prev[k][j]
					}
				}
			}
		}
		for k := 0; k < m; k++ {
			for i := 0; i < m; i++ {
				for j := 0; j < m; j++ {
					t_newlen := t_dist[i][k] + t_dist[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 <climits>
#include <iostream>
#include <vector>

struct Edge {
    Edge(int f, int t, int c, int tm) {
        from = f;
        to = t;
        cost[0] = c;
        cost[1] = tm;
    }
    int from, to, cost[2];
};

int main() {
    std::cin.tie(0);
    std::ios::sync_with_stdio(false);

    std::vector<Edge> edges;
    int n, m, k;
    while (std::cin >> n >> m && n != 0 && m != 0) {
        for (int i = 0; i < n; i++) {
            int from, to, cost, time;
            std::cin >> from >> to >> cost >> time;
            edges.push_back(Edge(from - 1, to - 1, cost, time));
        }

        std::cin >> k;
        for (int i = 0; i < k; i++) {
            auto sts = new int[m]();
            auto used = new bool[m]();
            for (int j = 0; j < m; j++) {
                sts[j] = INT_MAX;
                used[j] = false;
            }

            int start, end, query;
            std::cin >> start >> end >> query;

            int cur = start - 1;
            sts[cur] = 0;
            used[cur] = true;
            while (!used[end - 1]) {
                for (auto e : edges) {
                    if (e.to == cur && sts[e.from] > sts[cur] + e.cost[query])
                        sts[e.from] = sts[cur] + e.cost[query];
                    if (e.from == cur && sts[e.to] > sts[cur] + e.cost[query])
                        sts[e.to] = sts[cur] + e.cost[query];
                }
                for (int j = 0; j < m; j++) std::cout << sts[j] << ' ';
                std::cout << std::endl;

                int min_i, min_c = INT_MAX;
                for (int j = 0; j < m; j++)
                    if (!used[j] && min_c > sts[j]) {
                        min_i = j;
                        min_c = sts[j];
                    }
                used[min_i] = true;
                cur = min_i;
            }
            std::cout << sts[end - 1] << std::endl;
            delete[] sts;
            delete[] used;
        }
        edges.clear();
    }
}

C++: #include <stdio.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <limits.h>
#include <cctype>

#include <iostream>
#include <vector>
#include <deque>
#include <queue>
#include <map>
#include <algorithm>


using namespace std;

#define Max INT_MAX
#define Inf INT_MIN


#define rep(i, n) for(int i = 0; i < n; i++)
#define repi(i,l,n) for(int (i)=(int)(l);(i)<(int)(n);(i)++)
// s <= x < g ?
#define IN(x,s,g) ((x) >= (s) && (x) < (g))
// 0 <= x < w && 0 <= y < h ?
#define ISIN(x,y,w,h) (IN((x),0,(w)) && IN((y),0,(h)))



struct edge {
    int to, cost;
    edge(int t, int c){
        to = t;
        cost = c;
    }
};

//first=最短距離 second=頂点の番号
typedef pair<int, int> P;

int d[100];


//sからの最短距離をdに格納する
void dijkstra(int s, vector<edge> *G ){
    //フロンティア頂点集合
    priority_queue<P, vector<P>, greater<P> > que; //小さい順指定
    fill(d, d+100, Max);

    d[s] = 0;
    que.push( P(0,s) ); //s -> sは距離0

    while(!que.empty() ) {
        P p = que.top(); que.pop(); //フロンティアの中から一番小さい辺を取り出す 
        int v = p.second;
        if( d[v] < p.first) continue;

        rep(i, G[v].size() ) {
            edge e = G[v][i]; //v->iのエッジ
            //cout << "i = " << i << endl;
            //cout << "G[v][i].to = " << G[v][i].to<< endl;
            //cout << "G[v][i].cost = " << G[v][i].cost << endl;

            //cout << "v = " << v << endl; 
            //cout << "d[v] = " << d[v] << endl;
            //cout << "e.to = " << e.to << endl;
            //cout << "e.cost = " << e.to << endl;
            //cout << "d[e.to] = " << d[e.to] << endl;
            if( d[e.to] > d[v] + e.cost){
                d[e.to] = d[v] + e.cost;
                que.push( P(d[e.to], e.to) );
            }
        }
    }
}

vector<edge> costs[100];
vector<edge> times[100];

int main()
{
    int tmp = 0;

    int n,m;
    while(cin >> n >> m){
        if( n == 0 && m == 0 ) { break; }
        rep(i,100){
            costs[i].clear();
            times[i].clear();
        }
        
        rep(i,n){
            int a,b, cost_v,time_v;
            cin >> a >> b >> cost_v >> time_v;
            //edge ee = edge(b,cost_v);
            //cout << "ee.to = "  << ee.to << endl; 
            //cout << "ee.cost = " << ee.cost << endl;
            costs[a-1].push_back( edge(b-1, cost_v) );
            costs[b-1].push_back( edge(a-1, cost_v) );

            times[a-1].push_back( edge(b-1, time_v) );
            times[b-1].push_back( edge(a-1, time_v) );

            //cout << "_cost = " << cost_v << endl;
            //cout << "_time = " << time_v << endl;
            //cout << "a,b = " << a << " " << b << endl;
            //cout << endl;
        }

        int k;
        cin >> k;

        rep(i,k){
            int p,q,r;
            cin >> p >> q >> r;
            if( r == 0){
                dijkstra(p-1, costs);
            } else {
                dijkstra(p-1, times);
            }
            cout << d[q-1] << endl;
        }
    }
    return 0;


}