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
			c_matrix[b-1][a-1] = c
			t_matrix[a-1][b-1] = t
			t_matrix[b-1][a-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<stdio.h>
#include<stdlib.h>
#include<iostream>
#include<string.h>
#include<math.h>
#include<cstring>
using namespace std;
#define INF 100000000
int mini(int a,int b){
	if(a<b){
		return a;
	}else{
		return b;
	}
}

int cost(int p,int q,int m,int co[][101]){
	int i,s[101],a,j,d[101],b;
	for(i=0;i<=m;i++){s[i]=0;d[i]=INF;}
	a=p;s[a]=1;d[a]=0;
	for(i=1;i<=m;i++){
		for(j=1;j<=m;j++){
			d[j]= mini(d[j],d[a]+co[a][j]);
		}
		s[a]=1;b=INF;
		for(j=1;j<=m;j++){
			if(s[j]==0&&d[j]<=b){
				a=j;b=d[j];
			}
		}
		s[a]=1;
	}
	return d[q];
}

int main(){
	while(1){
		int i,a=0,b=0,p,q,r,j,k,n,m,co[101][101],ti[101][101],s[101],ans[200];
		for(i=0;i<101;i++){
			s[i]=0;
			for(j=0;j<101;j++){
				if(i==j){
					co[i][j]=0;
					ti[i][j]=0;
				}else{
					co[i][j]=INF;
					ti[i][j]=INF;
				}
			}
		}
		cin>>n>>m;
		if(n==0&&m==0)break;
		for(i=0;i<n;i++){
			cin>>a>>b;
			cin>>co[a][b]>>ti[a][b];
			co[b][a]=co[a][b];
			ti[b][a]=ti[a][b];
		}
		cin>>k;
		for(i=0;i<k;i++){
			cin>>p>>q>>r;
			if(r==0){
				ans[i]=cost(p,q,m,co);
			}else{
				ans[i]=cost(p,q,m,ti);
			}
		}
		for(i=0;i<k;i++){
			cout<<ans[i]<<endl;
		}
	}

    return 0;
}

C++: #include<cstdio>

int costs[100][100][2];

int main(){
 int n,m,a,b;
 scanf("%d%d",&n,&m);
 while(n--){
  scanf("%d%d",&a,&b);
  scanf("%d%d",&costs[a][b][0],&costs[a][b][1]);
  costs[b][a][0]=costs[a][b][0];
  costs[b][a][1]=costs[a][b][1];
 }
 for(int i=0;i<m;i++){
  for(int j=0;j<m;j++){
   for(int k=0;k<m;k++){
    costs[i][j][0]=costs[i][k][0]+costs[k][j][0];
    costs[j][i][0]=costs[i][j][0];
    costs[i][j][1]=costs[i][k][1]+costs[k][j][1];
    costs[j][i][1]=costs[i][j][1];
   }
  }
 }
 scanf("%d",&n);
 while(n--){
 scanf("%d&d&d",&a,&b,&m);
 printf("%d\n",costs[a][b][m]);
}
 return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <set>
#include <climits> 
#include <map>
using namespace std;

const int MAX_V = 1000; // ???????????°????????§???
const int INF = 1000000; // ???????????§?????????(int ???????????§???)
int v; // ????????°
int g[MAX_V][MAX_V]; // ??£??\??????
int g2[MAX_V][MAX_V];
int d[MAX_V]; // ??????s ????????????????????¢
bool used[MAX_V]; // ?????§??????????????¢????¢??????????????????¨???????????°

void dijkstra(int s)
{
  // ??????
  fill(d, d + v, INF);
  fill(used, used + v, false);

  

  d[s] = 0;
  // ??????s ????????????????????????????????¢????¨????
  for(;;){
    // ???????¢???????????????????????????????????????¢???????°???????????????¢???
    // ?????????????????¢???????????????????????¢????¢??????????
    int i = -1;
    for(int j = 0; j < v; ++j)
      if(!used[j] && (i == -1 || d[i] > d[j]))
	i = j;
    if(i == -1)break; // ??¨??????????????????????????¢????¢????????????´???
    // ?????????????????¢???????????????????????¢?¢????
    used[i] = true;
    // ???????????¢????¢?????????????????????£??\????????????????????±?????´??°
    for(int j = 0; j < v; ++j)
      d[j] = min(d[j], d[i] + g[i][j]);
  }
}

void dijkstra2(int s)
{
  // ??????
  fill(d, d + v, INF);
  fill(used, used + v, false);
  d[s] = 0;
  // ??????s ????????????????????????????????¢????¨????
  for(;;){
    // ???????¢???????????????????????????????????????¢???????°???????????????¢???
    // ?????????????????¢???????????????????????¢????¢??????????
    int i = -1;
    for(int j = 0; j < v; ++j)
      if(!used[j] && (i == -1 || d[i] > d[j]))
	i = j;
    if(i == -1)break; // ??¨??????????????????????????¢????¢????????????´???
    // ?????????????????¢???????????????????????¢?¢????
    used[i] = true;
    // ???????????¢????¢?????????????????????£??\????????????????????±?????´??°
    for(int j = 0; j < v; ++j)
      d[j] = min(d[j], d[i] + g2[i][j]);
  }
}


int main()
{
  for(;;){
    int gv, ge;
    cin >> ge >> gv;
    if(ge==0){return 0;}

    fill(&g[0][0], &g[MAX_V][0], 100000);
    fill(&g2[0][0], &g2[MAX_V][0], 100000);


    for(int i = 0; i < ge; ++i){
      int gs, gt, gd,gd2;
      cin >> gs >> gt >> gd >> gd2;
      g[gs-1][gt-1]=gd;
      g[gt-1][gs-1]=gd;
      g2[gs-1][gt-1]=gd2;
      g2[gs-1][gt-1]=gd2;
    }
    v = gv;

    //for(int i=0;i<v;i++){for(int j=0;j<v;j++){cout << g[i][j] << " ";}cout << endl;}
    
    int k;
    cin >> k;
    for(int i=0;i<k;i++){
      int p,q,r;
      cin >> p >> q >> r;
      if(r==0){
	dijkstra(p-1);
	//for(int j=1;j<=gv;j++)
	  cout << d[q-1] << endl;
      }else{
	dijkstra2(p-1);
	//for(int j=0;j<=gv;j++)
	  cout << d[q-1] << endl;
      }
    }
  }
  return 0;
}