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]
					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 <queue>
#include <map>
#define INF (int)1e9


int common_part(int m, int p, int q, std::vector<std::vector<std::pair<int, int> > > v); 
void bellman_ford(int m, std::vector<std::vector<std::pair<int, int> > > &v, std::vector<int> &rvec); 
void dijkstra(int m, int p, std::vector<std::vector<std::pair<int, int> > > &v, std::vector<int> &rvec); 


int main(void) {
    int n;
    int m;

    int a;
    int b;
    int cost;
    int time;

    int k;

    int p;
    int q;
    int r;

    int res;

    while (true) {
        std::cin >> n >> m;
        if (n == 0 && m == 0) {
            break; 
        }

        std::vector<std::vector<std::pair<int, int> > > vcost(m);
        std::vector<std::vector<std::pair<int, int> > > vtime(m);

        for (int i = 0; i < n; i++) {
            std::cin >> a >> b >> cost >> time;
            --a;
            --b;
            vcost[a].push_back(std::make_pair(cost, b));
            vcost[b].push_back(std::make_pair(cost, a));
            vtime[a].push_back(std::make_pair(time, b));
            vtime[b].push_back(std::make_pair(time, a));
        }

        std::cin >> k;

        for (int i = 0; i < k; i++) {
            std::cin >> p >> q >> r;
            --p;
            --q;

            // Bellman Ford or Dijkstra
            if (r == 0) {
                res = common_part(m, p, q, vcost);
            } else {
                res = common_part(m, p, q, vtime);
            }
            std::cout << res << std::endl;
        }
    }
    return 0;
}

void bellman_ford(int m, std::vector<std::vector<std::pair<int, int> > > &v, std::vector<int> &rvec) {
    int value;
    int target;
    bool flag;

    do{
        flag = false;

        for (int i = 0; i < m; i++) {
            for (int j = 0; j < v[i].size(); j++) {
                value = v[i][j].first;
                target = v[i][j].second;
                if (rvec[target] > rvec[i] + value) {
                    rvec[target] = rvec[i] + value;
                    flag = true;
                }
            }
        }

    } while(flag);

    return;
} 

void dijkstra(int m, int p, std::vector<std::vector<std::pair<int, int> > > &v, std::vector<int> &rvec) {
    std::priority_queue<std::pair<int, int>, std::vector<std::pair<int, int> >, std::greater<std::pair<int, int> > > pq;
    std::vector<int> search_count(m, 0);
    int start_value;
    int start_target;
    int end_value;
    int end_target;
    pq.push(std::make_pair(rvec[p], p));

    while(! pq.empty()) {
        start_target = pq.top().second;
        start_value = pq.top().first; 
        pq.pop();
        if (search_count[start_target] != 0) {
            continue;
        }

        ++search_count[start_target];

        for (int i = 0; i < v[start_target].size(); i++) {
            end_value = v[start_target][i].first;
            end_target = v[start_target][i].second;
            if (rvec[end_target] > end_value + rvec[start_target]) {
                rvec[end_target] = end_value + rvec[start_target];
                pq.push(std::make_pair(rvec[end_target], end_target));
            }
        }
    }

    return;
} 

int common_part(int m, int p, int q, std::vector<std::vector<std::pair<int, int> > > v) {
    std::vector<int> rvec(m, INF);
    rvec[p] = 0;

    //bellman_ford(m, v, rvec);
    dijkstra(m, p, v, rvec);

    return rvec[q];
}

C++: #include<iostream>
#include<algorithm>
const int INF = 1<<20;
const int N = 101;
int cost[N][N];
int tim[N][N];
using namespace std;
int main()
{
	int n, m, a, b, co, ti,r;
	while (1){
		cin >> n >> m;
		if (n == 0 && m == 0)return 0;
		for (int i = 0; i < N; i++){
			for (int i2 = 0; i2 < N; i2++){
				cost[i][i2] = INF;
				tim[i][i2] = INF;
			}
		}
		for (int i = 0; i < n; i++){
			cin >> a >> b >> co >> ti;
			cost[a][b] = co;
			cost[b][a] = co;
			tim[a][b] = ti;
			tim[b][a] = ti;
		}
		for (int k = 0; k < m+1; ++k)
			for (int i = 0; i < m+1; ++i)
				for (int j = 0; j < m+1; ++j)
				{
					cost[i][j] = min(cost[i][j], cost[i][k] + cost[k][j]);
					tim[i][j] = min(tim[i][j], tim[i][k] + tim[k][j]);
				}
		cin >> m;
		for (int i = 0; i < m; i++){
			cin >> a >> b >> r;
			if (r == 0){
				cout << cost[a][b] << endl;
			}
			else
				cout << tim[a][b] << endl;
		}
	}
}

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

const int INF = 1000;

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

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

		int C[101][101];
		int T[101][101];
		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++){
					if(C[i][j]>C[i][j]+C[k][j]){
						C[i][j] = C[i][k]+C[k][j];
					}
					if(T[i][j]>T[i][j]+T[k][j]){
						T[i][j] = T[i][k]+T[k][j];
					}
				}
			}
		}
		}
	
		int k;
		cin >> k;
		
		if(k<0 || k>201)
			break;
	
		for(int i=0; i<k; i++){
		int p, q, r;
		cin >> p >> q >> r;

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

	return 0;
}