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 <vector>
#include <map>
#include <set>
#include <stack>
#include <queue>
#include <deque>
#include <algorithm>
#include <utility>
#include <functional>
#include <sstream>
#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <climits>
using namespace std;
inline int toInt(string s) { int v; istringstream sin(s); sin >> v; return v;}
template<class T> inline string toString(T x) { ostringstream sout; sout << x; return sout.str();}
typedef vector<int> vi;
typedef vector<vi>  vvi;
typedef vector<string> vs;
typedef pair<int, int> pii;
typedef long long ll;
#define ALL(a) (a).begin(),(a).end()
#define RALL(a) (a).rbegin(),(a).rend()
#define EACH(t,i,c) for(t::iretator i=(c).begin(); i!=(c).end(); ++i)
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define FOR(i,a,b) for(int i=(a);i<=(b);++i)
#define REP(i,n) FOR(i,0,(n)-1)
const double EPS = 1e-10;
const double PI = acos(-1.0);

const int INF = INT_MAX/10;

struct state {
	int s, c;
	state(int s, int c) : s(s), c(c) {};
	bool operator<(const state other)const {
		return c>other.c;
	}
};

int main() {
	int n, m;
	while(cin >> n >> m, n) {
		int a, b, c, t;
		vector<vvi> data(2, vvi(n, vi(n, INF)));
		REP(i, n) {
			cin >> a >> b >> c >> t;
			data[0][a-1][b-1] = c;
			data[0][b-1][a-1] = c;
			data[1][a-1][b-1] = t;
			data[1][b-1][a-1] = t;
		}
		
		int k;
		cin >> k;
		REP(i, k) {
			int p, q, r;
			cin >> p >> q >> r;

			priority_queue<state> Q;
			Q.push(state(p-1, 0));
			vi cost(n, INF);
			cost[p-1] = 0;
			while(!Q.empty()) {
				state st = Q.top();
				Q.pop();
				if(st.s == q-1) {
					cost[q-1] = min(cost[q-1], st.c);
					continue;
				}
				REP(j, n) {
					if(st.s != j && data[r][st.s][j] != INF) {
						int ncost = st.c + data[r][st.s][j];
						if(ncost < cost[j]) {
							cost[j] = ncost;
							Q.push(state(j, ncost));
						}
					}
				}
			}
			cout << cost[q-1] << endl;
		}
	}

	return 0;
}

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

const int INF = 1000000000;

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

		if(n==0 && m==0)
			break;

		int C[100][100];
		int T[100][100];
		for(int i=0; i<m; i++){
			for(int j=0; j<m; j++){
				if(i==j){
					C[i][j] = T[i][j] = 0;
				}
				else{
					C[i][j] = T[i][j] = INF;
				}
			}
		}

		for(int i=0; i<n; i++){
			int a, b, c, t;
			cin >> a >> b >> c >> t;

			C[a-1][b-1] = C[b-1][a-1] = c;
			T[a-1][b-1] = T[b-1][a-1] = t;
		}

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

		for(int k=0; k<m; k++){
			for(int i=0; i<m; i++){
				for(int j=0; j<m; j++){
					if(C[i][j]>C[i][k]+C[k][j]){
						C[i][j] = C[i][k]+C[k][j];
					}
					if(T[i][j]>T[i][k]+T[k][j]){
						T[i][j] = T[i][k]+T[k][j];
					}
				}
			}
		}

		for(int i=0; i<k; i++){
			int s=p[i]-1; int g=q[i]-1;
			if(r[i]==0){
				cout<<C[s][g]<<endl;
			}
			else{
				cout<<T[s][g]<<endl;
			}
		}

	}

	return 0;
}

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

const int INF = 1000000000;

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

		if(n==0 && m==0)
			break;

		int Cost[100][100];
		int Time[100][100];
		for(int i=0; i<m; i++){
			for(int j=0; j<m; j++){
				if(i==j){
					Cost[i][j] = Time[i][j] = 0;
				}
				else{
					Cost[i][j] = Time[i][j] = INF;
				}
			}
		}

		for(int i=0; i<n; i++){
			int a, b, c, t;
			cin >> a >> b >> c >> t;

			Cost[a-1][b-1] = Cost[b-1][a-1] = c;
			Time[a-1][b-1] = Time[b-1][a-1] = t;
		}
    for(int i =0;i<m;i++){
      for(int j =0;j<m;j++){
        for(int k = 0;k<m;k++){
          if(Cost[j][k]>Cost[j][i]+Cost[i][k]){
            Cost[j][k]=Cost[j][i]+Cost[i][k];
          }
          if(Time[j][k]>Time[j][i]+Time[i][k]){
            Time[j][k]=Time[j][i]+Time[i][k];
          }
        }
      }
    }
    int k;
    cin >>k;
    for(int i =0;i<k;i++){
      int p,q,r;
      cin >>p>>q>>r;
      if(r)cout << Time[p-1][q-1]<<endl;
      else cout << Cost[p-1][q-1]<<endl;
    }
  }
  return 0;
}

C++: // 2013/11/25 Tazoe

#include <iostream>
#include <algorithm>
using namespace std;

const int INF = 1000000000;

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

		if(n==0&&m==0)
			break;

		int C[100][100];
		int T[100][100];
		for(int i=0; i<m; i++){
			for(int j=0; j<m; j++){
				if(i==j){
					C[i][j] = T[i][j] = 0;
				}
				else{
					C[i][j] = T[i][j] = INF;
				}
			}
		}

		for(int i=0; i<n; i++){
			int a, b, c, t;
			cin >> a >> b >> c >> t;

			C[a-1][b-1] = C[b-1][a-1] = c;
			T[a-1][b-1] = T[b-1][a-1] = t;
		}

		for(int k=0; k<m; k++){
			for(int i=0; i<m; i++){
				for(int j=0; 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;

			if(r==0){
				cout << C[p-1][q-1] << endl;
			}
			else{
				cout << T[p-1][q-1] << endl;
			}
		}
	}

	return 0;
}