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>

using namespace std;

const int MAX_N = 102;
const int INF = 10000;
int d_cost[MAX_N][MAX_N];
int d_time[MAX_N][MAX_N];
int n, m;

void warshall_floyd(int d[MAX_N][MAX_N])
{
    for (int k = 0; k < m; k++)
        for (int i = 0; i < m; i++)
            for (int j = 0; j < m; j++)
                d[i][j] = min(d[i][j], d[i][k] + d[k][j]);
}

int main()
{
    while (cin >> n >> m, n || m) {
        int a, b, cost, time;
        int k, p, q, r;

        // 初期化
        for (int i = 0; i < n; i++)
            for (int j = 0; j < n; j++) {
                if (i == j) 
                    d_cost[i][j] = d_time[i][j] = 0;
                else
                    d_cost[i][j] = d_time[i][j] = INF;
            }

        for (int i = 0; i < n; i++) {
            cin >> a >> b >> cost >> time;
            a--, b--;
            d_cost[a][b] = d_cost[b][a] = cost;
            d_time[a][b] = d_time[b][a] = time;
        }
        warshall_floyd(d_cost);
        warshall_floyd(d_time);

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

            p--, q--;
            if (r == 0)
                cout << d_cost[p][q] << endl;
            else
                cout << d_time[p][q] << endl;
        }
    }

    return 0;
}

C++: #include <iostream>
#include <algorithm>
#include <queue>
using namespace std;
const int MAX_INT = 10000000;
int n, m;
int p, q, r;

int costMap[101][101];
int timeMap[101][101];
int visited[101];

class Node {
public:
	int cost, pos;
	Node(int p) {
		cost = 0;
		pos = p;
	}
	Node(int p, int c, const Node& pre) {
		cost = c + pre.cost;
		pos = p;
	}
	bool operator< (const Node& o) const {
		return cost > o.cost;
	}
};

int memo[101][101][2];

int main () {
	while (cin >> n >> m, n || m) {
		for (int i = 0; i <= m; i++) {
			fill(costMap[i], costMap[i] + m + 1, MAX_INT);
			fill(timeMap[i], timeMap[i] + m + 1, MAX_INT);
		}
		for (int i = 0; i < n; i++) {
			int a, b, cost, time;
			cin >> a >> b >> cost >> time;
			costMap[a][b] = costMap[b][a] = cost;
			timeMap[a][b] = timeMap[b][a] = time;
		}
		int k;
		for (int i = 0; i <= m; i++) {
			for (int j = 0; j <= m; j++) {
				memo[i][j][0] = 0x7fffffff;
				memo[i][j][1] = 0x7fffffff;
			}
		}
		for (cin >> k; k; k--) {
			cin >> p >> q >> r;
			if (memo[p][q][r] != 0x7fffffff) {
				cout << memo[p][q][r] << endl;
				continue;
			}
			fill(visited, visited + m + 1, MAX_INT);
			priority_queue<Node> que;
			que.push(Node(p));
			visited[p] = 0;
			while (!que.empty()) {
				Node current = que.top();
				que.pop();
				if (current.pos == q) {
					cout << current.cost << endl;
					memo[p][q][r] = memo[q][p][r] = current.cost;
					break;
				}
				for (int i = 1; i <= m; i++) {
					if (r) {
						if (timeMap[current.pos][i] != MAX_INT && timeMap[current.pos][i] + current.cost < visited[i]) {
							visited[i] = timeMap[current.pos][i] + current.cost;
							que.push(Node(i, timeMap[current.pos][i], current));
							//cout << current.pos << " to " << i << endl;
						}
					}
					else {
						if (costMap[current.pos][i] != MAX_INT && costMap[current.pos][i] + current.cost < visited[i]) {
							visited[i] = costMap[current.pos][i] + current.cost;
							que.push(Node(i, costMap[current.pos][i], current));
							//cout << current.pos << " to " << i << endl;
						}
					}
				}
			}
		}
	}
	return 0;
}

C++: //56
#include<iostream>
#include<algorithm>

using namespace std;

#define INF (1<<29)

int main(){
  for(int n,m;cin>>n>>m,n|m;){
    int cm[101][101];
    int tm[101][101];
    fill_n(cm[0],101*101,INF);
    fill_n(tm[0],101*101,INF);
    for(int i=1;i<=100;i++){
      cm[i][i]=tm[i][i]=0;
    }
    for(int i=0;i<n;i++){
      int a,b,c,t;
      cin>>a>>b>>c>>t;
      tm[a][b]=tm[b][a]=t;
      cm[a][b]=cm[b][a]=c;
    }
    for(int k=1;k<=100;k++){
      for(int j=1;j<=100;j++){
	for(int i=1;i<=100;i++){
	  tm[i][j]=min(tm[i][j],tm[i][k]+tm[k][j]);
	  cm[i][j]=min(cm[i][j],cm[i][k]+cm[k][j]);
	}
      }
    }
    int k;
    cin>>k;
    while(k--){
      int p,q,r;
      cin>>p>>q>>r;
      cout<<((r)?tm:cm)[p][q]<<endl;
    }
  }
  return 0;
}