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 <cstdio>
#include <algorithm>
#include <vector>
#include <queue>

using namespace std;

const int INFTY=1<<29;

struct Edge{
	int src,dst,weight;
	Edge(){}
	Edge(int s,int d,int w):src(s),dst(d),weight(w){}
	bool operator<(const Edge& e)const{return weight<e.weight;}
	bool operator>(const Edge& e)const{return weight>e.weight;}
};
typedef vector<vector<Edge> > Graph;

void dijkstra(const Graph& g,int start,vector<int>& dist)
{
	priority_queue<Edge,vector<Edge>,greater<Edge> > pq;
	pq.push(Edge(-1,start,0));
	while(pq.size()){
		Edge cur=pq.top(); pq.pop();
		if(dist[cur.dst]!=INFTY) continue;
		dist[cur.dst]=cur.weight;
		for(int i=0;i<g[cur.dst].size();i++){
			Edge e=g[cur.dst][i];
			pq.push(Edge(e.src,e.dst,cur.weight+e.weight));
		}
	}
}

int main()
{
	for(int n,m;scanf("%d%d",&n,&m),n|m;){
		Graph g1(m),g2(m);
		for(int i=0;i<n;i++){
			int a,b,cost,time; scanf("%d%d%d%d",&a,&b,&cost,&time);
			a--; b--;
			g1[a].push_back(Edge(a,b,cost));
			g1[b].push_back(Edge(b,a,cost));
			g2[a].push_back(Edge(a,b,time));
			g2[b].push_back(Edge(b,a,time));
		}
		vector<vector<int> > w1(m,vector<int>(m,INFTY)),w2=w1;
		for(int i=0;i<m;i++){
			dijkstra(g1,i,w1[i]);
			dijkstra(g2,i,w2[i]);
		}
		int k; scanf("%d",&k);
		for(int i=0;i<k;i++){
			int p,q,r; scanf("%d%d%d",&p,&q,&r);
			if(r==0)
				printf("%d\n",w1[p-1][q-1]);
			else
				printf("%d\n",w2[p-1][q-1]);
		}
	}
	
	return 0;
}

C++: #include<iostream>
using namespace std;
int c[110][110];
int t[110][110];
int main(){
	int n,m;
	cin>>n>>m;
	for(int i=1;i<=m;i++){
		for(int j=1;j<=m;j++){
			c[i][j]=t[i][j]=10000000;
		}
	}
	for(int i=0;i<n;i++){
		int a,b,cost,time;
		cin>>a>>b>>cost>>time;
		c[a][b]=c[b][a]=cost;
		t[a][b]=t[b][a]=time;
	}
	for(int k=1;k<=m;k++){
		for(int i=1;i<=m;i++){
			for(int j=1;j<=m;j++){
				c[i][j]=min(c[i][j],c[i][k]+c[k][j]);
				t[i][j]=min(t[i][j],t[i][k]+t[k][j]);
			}
		}
	}
	int k;
	cin>>k;
	for(int i=0;i<k;i++){
		int p,q,r;
		cin>>p>>q>>r;
		cout<<(r?t[p][q]:c[p][q])<<endl;
	}
	return 0;
}

C++: #include<iostream>
#include<vector>
#include<map>
#include<queue>
#include<functional>
#define INF 1000000000//INF=∞
using namespace std;
typedef pair<int, int> P;//firstは最短距離,secondは頂点番号

const int MAX_M = 100;

struct edge {
  int to, cost;
  //edge() : to(0), cost(0) {}
  //edge(int to, int cost) : to(to), cost(cost) {}
};
int V;//頂点の数

vector<vector<edge> > time_graph(MAX_M); //頂点間の距離情報(隣接リスト)
vector<vector<edge> > cost_graph(MAX_M);

vector<vector<int> > time_ds(MAX_M);
vector<vector<int> > cost_ds(MAX_M);

int dijkstra_time(int s, int g){
  if (!time_ds[s].empty()) return time_ds[s][g];
  
  priority_queue<P, vector<P>, greater<P> > que;
  vector<int> d(V, INF);//最短距離を記録する配列(∞で初期化しておく)
  d[s] = 0;//頂点sから頂点sへの最短距離は0で確定
  que.push(P(0, s));//距離0,頂点sからスタート

  while(!que.empty()){
    /*処理1*/
    //キューの中で最も頂点sからの距離が近い頂点vとその距離cを取得
    P p = que.top();
    que.pop();
    int v = p.second, c = p.first;

    /*処理2*/
    //頂点vの最短距離がすでに確定していたらcontenue
    if(d[v] < c)
      continue;

    /*処理3*/
    //頂点vの最短距離が既に確定していなければ頂点vへの最短経路はcで確定
      d[v]=c;

    /*処理4*/
    //頂点vから移動しうる頂点とその距離をキューに入れる
    for(int i = 0; i < time_graph[v].size(); i++){
      //頂点vはG[v].size()個の行き先を持つ
      edge e = time_graph[v][i];
      if(d[e.to] > d[v] + e.cost){
        que.push(P(d[v] + e.cost, e.to));
      }
    }
  }
  time_ds[s] = d;
  return d[g];//頂点gへの最短距離を返す
}


int dijkstra_cost(int s, int g){
  if (!cost_ds[s].empty()) return cost_ds[s][g];
  
  priority_queue<P, vector<P>, greater<P> > que;
  vector<int> d(V, INF);//最短距離を記録する配列(∞で初期化しておく)
  d[s] = 0;//頂点sから頂点sへの最短距離は0で確定
  que.push(P(0, s));//距離0,頂点sからスタート

  while(!que.empty()){
    P p = que.top();
    que.pop();
    int v = p.second, c = p.first;

    if(d[v] < c)
      continue;

      d[v]=c;

    for(int i = 0; i < cost_graph[v].size(); i++){
      edge e = cost_graph[v][i];
      if(d[e.to] > d[v] + e.cost){
        que.push(P(d[v] + e.cost, e.to));
      }
    }
  }

  cost_ds[s] = d;
  return d[g];//頂点gへの最短距離を返す
}


int main() {
  int n, m;
  while (cin >> n >> m, n || m) {
    V = m;

    for (int i = 0; i < MAX_M; i++) {
      time_graph[i].clear();
      time_ds[i].clear();
      cost_graph[i].clear();
      cost_ds[i].clear();
    }

    for (int i = 0; i < n; i++) {
      int a, b, time, cost;
      cin >> a >> b >> time >> cost;
      a--; b--; // 0-indexedにする
      edge e1,e2,e3,e4;
      e1.to = e3.to = b; e1.cost = e2.cost = time;
      e2.to = e4.to = a; e3.cost = e4.cost = cost;
      time_graph[a].push_back(e1);
      time_graph[b].push_back(e2);
      cost_graph[a].push_back(e3);
      cost_graph[b].push_back(e4);
    }

    int k;
    cin >> k;
    for (int i = 0; i < k; i++) {
      int p, q, r;
      cin >> p >> q >> r;
      p--; q--;
      if (p > q) swap(p, q);
      if (r == 0)
        cout << dijkstra_time(p, q) << endl;
      else
        cout << dijkstra_cost(p, q) << endl;
    }
  }
}