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 INF = 1000000000;

int main(){

int n,m;
int a,b,c,t;
int k,p,q,r;

while(true){
 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++){
  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 x=0; x<m; x++){
  for(int y=0; y<m; y++){ 
   for(int z=0; z<m; z++){
    if(T[y][z]>T[y][x]+T[x][z]){
     T[y][z]=T[y][x]+T[x][z];
    }
    if(C[y][z]>C[y][x]+C[x][z]){
     C[y][z]=C[y][x]+C[x][z];
    }
   }
  }
 }

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

return 0;
}

C++: //2013/11/15(Fri)

#include <iostream>
using namespace std;
int main()
{
	int n,m;
	int a,b,cost[3000][3000],time[3000][3000];
	int k;
	int p,q,r;
	int INF = 1001;

	int dcost[3000][3000],dtime[3000][3000];
	while(true){
		cin >> n >> m;
		if(n==0 && m==0)
			break;

		for(int i=0; i<n; i++)
			for(int j=0; j<n; j++){
				if(i==j){
					cost[i][j] = 0;
					time[i][j] = 0;
				}		
				else{
					cost[i][j] = INF;
					time[i][j] = INF;
				}
			}

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

			
		for(int i=0; i<n; i++)
			for(int j=0; j<n; j++){
				dcost[i][j] = cost[i][j];
				dtime[i][j] = time[i][j];
			}
		for(int h=0; h<n; h++)
			for(int i=0; i<n; i++)
				for(int j=0; j<n; j++){
					if(dcost[i][j] > dcost[i][h] + dcost[h][j])
						dcost[i][j] = dcost[i][h] + dcost[h][j];
					if(dtime[i][j] > dtime[i][h] + dtime[h][j])
						dtime[i][j] = dtime[i][h] + dtime[h][j];
				}

		cin >> k;
		for(int i=0; i<k; i++){
			cin >> p >> q >> r;
			if(r == 0)
				cout << dcost[p][q] << endl;
			else if(r == 1)
				cout << dtime[p][q] << endl;
		}
	}
	return 0;
}

C++: #include<cstdio>
#include<iostream>
#include<cstring>
#include<algorithm>
using namespace std;
#define INF 99999
int dijkstra(int x,int y,int p);
int D[110][110][2];/*Adjacency matrix*/
int m;
int main(){
    while(1){
        int n;
        cin >> n >> m;
        if(n == 0 && m == 0)break;
        for(int i = 1; i <= n; i++){
            for(int j = 1; j <= n; j++){
                if(i == j){
                    D[i][j][0] = 0;
                    D[i][j][1] = 0;
                    continue;
                }
                D[i][j][0] = INF;
                D[i][j][1] = INF;
            }
        }
         
        for(int i = 0; i < n; i++){
            int from,to,cst,tm;
            scanf("%d%d%d%d",&from,&to,&cst,&tm);
            D[from][to][0] = cst;
            D[to][from][0] = cst;
            D[from][to][1] = tm;
            D[to][from][1] = tm;
        }
        int k;
        scanf("%d",&k);
        for(int i = 0; i < k; i++){
            int from,to,x;
            cin >> from >> to >> x;
            cout << dijkstra(from,to,x) << endl;
        }
    }
    return 0;
}
int dijkstra(int x,int y,int p){
    int dist[128];
    bool done[128]={false};
    for(int i = 1; i <= m; i++){
        dist[i] = INF;
    }
     
    dist[x] = 0;
    int cost = 0;
    while(1){
        int e = -1;
        for(int i = 1; i <= m; i++){
            if(done[i] == false && (e == -1 || dist[i] < dist[e])){
                e = i;
            }
        }
        if(e == -1)break;
        done[e] = true;
        if(e == y){
            cost = dist[e];
            break;
        }
         
        for(int i = 1; i <= m; i++){
            if(p == 0)dist[i] = min(dist[i],dist[e]+D[e][i][0]);
            else dist[i] = min(dist[i],dist[e]+D[e][i][1]);
        }
         
    }
    return cost;
}