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
			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
					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<iostream>
#include<vector>
#include<algorithm>
#include<utility>
#include<string>
#include<cmath>
#include<cstring>
#include<queue>
#include<map>
#include<climits>
#include<queue>

#define REP(i, n) for(int i = 0;i < n;i++)
#define REPR(i, n) for(int i = n;i >= 0;i--)
#define FOR(i, m, n) for(int i = m;i < n;i++)
#define FORR(i, m, n) for(int i = m;i >= n;i--)
#define SORT(v, n) sort(v, v+n);
#define VSORT(v) sort(v.begin(), v.end());
#define llong long long
#define pb(a) push_back(a)
using namespace std;
typedef pair<int, int> P;
typedef long long int ll;
typedef pair<ll,ll> LLP;
int dx[4] = {1,0,0,-1};
int dy[4] = {0,1,-1,0};
#define INF 1000000007
#define MOD 1000000007
#define ARRAY_MAX 105


void warshal_floyd(vector<vector<int> >& dp){
    REP(k,ARRAY_MAX){
        REP(i,ARRAY_MAX){
            REP(j,ARRAY_MAX){
                dp[i][j] = min(dp[i][j],dp[i][k] + dp[k][j]);
            }
        }
    }
}


int main(){

    int n,m;
    while(cin >> n >> m,n){

        int a,b,c,t;
        vector<vector<int> > mini_cost(ARRAY_MAX,vector<int>(ARRAY_MAX));
        vector<vector<int> > mini_time(ARRAY_MAX,vector<int>(ARRAY_MAX));

        REP(i,ARRAY_MAX){
            REP(j,ARRAY_MAX){
                mini_cost[i][j] = mini_time[i][j] = INF;
                if(i == j){
                    mini_cost[i][j] = mini_time[i][j] = 0;
                }
            }
        }


        REP(i,n){
            cin >> a >> b >> c >> t;
            a--;
            b--;
            mini_cost[a][b] = mini_cost[b][a] = c;
            mini_time[a][b] = mini_time[b][a] = t;
        }

        warshal_floyd(mini_time);//最小コスト
        warshal_floyd(mini_cost);//最小時間

        int k;
        cin >> k;
        REP(i,k){
            int p,q,r;
            cin >> p >> q >> r;
            p--;
            q--;
            if(r == 0){
                //最小コスト
                cout << mini_cost[p][q] << endl;
            }else{
                cout << mini_time[p][q] << endl;
            }
        }
        mini_cost.shrink_to_fit();
        mini_time.shrink_to_fit();
    }


    return 0;
}

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

int main(){
  int n, m, k;
  const int INF = 1 << 30;

  while(cin >> n >> m){
    if((n|m) == 0) break;

    vector<vector<vector<int> > > score(2, vector<vector<int> >(m, vector<int>(m, 0)));
    int a, b, cost, time;

    for(int i=0; i<n; i++){
      cin >> a >> b >> cost >> time;
      a--;
      b--;
      score[0][a][b] = score[0][b][a] = cost;
      score[1][a][b] = score[1][b][a] = time;
    }


    int p, q, r;

    cin >> k;
    while(k--){
      cin >> p >> q >> r; 
      vector<int> d(m, INF);
      --q;
      --p;
      queue<int> req;
      req.push(p);
      d[p] = 0; 
	while(! req.empty()){
	  int v = req.front();
	  req.pop();

	  for(int i=0; i<m; i++){
	    if(score[r][v][i] != 0){
	      if(d[v] + score[r][v][i] < d[i]){
		d[i] = d[v] + score[r][v][i];
		req.push(i);
	      } 
	    }
	  }
	}
	cout << d[q] << endl;
    }
  }
    return 0;
}

C++: #include<iostream>
#include<queue>
#include<vector>
#include<functional>

using namespace std;

struct Edge{
	int to,cost;
	Edge(){}
	Edge(int to,int cost):to(to),cost(cost){}
};

int dijkstra(const vector< vector<Edge> > vve,int s,int t){
	priority_queue<pair<int,int>, vector< pair<int,int> >, greater< pair<int,int> > > que;
	pair<int,int> pii;
	pii.first = 0;
	pii.second = s;
	que.push(pii);

	vector<int> dist(vve.size(), INT_MAX);
	
	while(!que.empty()){
		int cost = que.top().first;
		int now = que.top().second;
		que.pop();

		if(dist[now] <= cost){
			continue;
		}

		dist[now] = cost;

		for(int i=0;i<vve[now].size();i++){
			que.push( make_pair(vve[now][i].cost + cost, vve[now][i].to) );
		}
	}

	return dist[t];
}

int main(){
	int n,m;
	while(true){
		cin >> n >> m;
		if(n == 0 && m==0){
			break;
		}

		vector< vector<Edge> > coin(m);
		vector< vector<Edge> > time(m);

		for(int i=0;i<n;i++){
			int a,b,c,t;
			cin >> a >> b >> c >> t;
			coin[a-1].push_back(Edge(b-1,c));
			coin[b-1].push_back(Edge(a-1,c));
			time[a-1].push_back(Edge(b-1,t));
			time[b-1].push_back(Edge(a-1,t));
		}

		int k;
		cin >> k;
		for(int i=0;i<k;i++){
			int p,q,r;
			cin >> p >> q >> r;
			int ans;
			if(r){
				ans = dijkstra(time,p-1,q-1);
			}else{
				ans = dijkstra(coin,p-1,q-1);
			}
			cout << ans << endl;
		}
	}
}