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 <set>
#include <map>
#include <list>
#include <queue>
#include <stack>
#include <cmath>
#include <ctype.h>
#include <ctime>
#include <cstdio>
#include <vector>
#include <string>
#include <bitset>
#include <cctype>
#include <cstdlib>
#include <cstring>
#include <utility>
#include <numeric>
#include <complex>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <cassert>
#include <iostream>
#include <iterator>
#include <algorithm>

using namespace std;

#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i, n) REP(i, 0, n)

//4方向ベクトル→↑←↓
int dx[] ={1,0,-1,0};
int dy[] ={0,-1,0,1};

int n,m;//線路の情報の数,駅の数
int dpc[101][101];
int dpt[101][101];
const int INF = 100000000;


void WarshallFloyd(){
  for(int i = 1;i <= m;i++){
    for(int j = 1;j <=m;j++){
      for(int k = 1;k <=m;k++){
      dpc[j][k] =min(dpc[j][k],dpc[j][i]+dpc[i][k]);
      dpt[j][k] =min(dpt[j][k],dpt[j][i]+dpt[i][k]);
      }
    }
  }
  return;
}

int main()
{
  while(cin >>n>>m){
    if(n ==0&&m ==0){
      break;
    }
   
    for(int i = 1;i <=m ;i++){
      for(int j = 1;j <=m;j++){
	dpc[i][j] =INF;
	dpc[j][i] =INF;
	dpt[i][j] =INF;
	dpt[j][i] =INF;
      }
    }
    for(int i = 1;i <= m;i++){
      dpc[i][i] = 0;
      dpt[i][i] = 0;
    }
    for(int i = 0;i < n;i++){
      int from,to,cost,time;
      cin >>from>>to>>cost>>time;
      dpc[from][to] =cost;
      dpt[from][to] =time;
      dpc[to][from] =cost;
      dpt[to][from] =time;
    }
    /* for(int i = 1;i <=m;i++){
      for(int j = 1;j <=m;j++){
	cout <<"dpc["<<i<<"]["<<j<<"]"<<dpc[i][j] <<endl;
	cout <<"dpt["<<i<<"]["<<j<<"]"<<dpt[i][j] <<endl;
      }
      }*/
    WarshallFloyd();
    int k;//問い合わせの数
    cin >>k;
    for(int i = 0;i <k;i++){
      int s;
      int f;
      int r;
      cin >>s>>f>>r;
      if(r)
	cout<<dpt[s][f]<<endl;
      else
	cout<<dpc[s][f]<<endl;
    }
  }
  return 0;
}

C++: #include <bits/stdc++.h>
#define r(i,n) for(int i=0;i<n;i++)
#define INF 1<<29
using namespace std;
main(){
  int m,n;
  while(cin>>m>>n,n){
    int a1[n][n],a2[n][n],q,w,e,r;
    r(i,n)r(j,n){
      if(i==j)a2[i][j]=a1[i][j]=0;
      else a2[i][j]=a1[i][j]=INF;
    }
    while(m--){
      scanf("%d%d%d%d",&q,&w,&e,&r);q--;w--;
      a1[q][w]=a1[w][q]=e;
      a2[q][w]=a2[w][q]=r;
    }
    r(k,n)r(i,n)r(j,n){
      a1[i][j]=min(a1[i][j],a1[i][k]+a1[k][j]);
      a2[i][j]=min(a2[i][j],a2[i][k]+a2[k][j]);
    }
    cin>>e;
    while(e--){
      scanf("%d%d%d",&q,&w,&e);q--;w--;
      if(r)cout<<a2[w][q]<<endl;
      else cout<<a1[w][q]<<endl;
    }
  }
}

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

const int MAX_N = 3000;
const int MAX_M = 100;
const int INF = 1000000;

int dist[MAX_M + 1][MAX_M + 1], cost[MAX_M + 1][MAX_M + 1];

void initialize(int m) {
  for (int i = 1; i <= m; i++) {
    for (int j = 1; j <= m; j++) {
      dist[i][j] = dist[j][i] = (i == j)? 0:INF;
      cost[i][j] = cost[j][i] = (i == j)? 0:INF;
    }
  }
}

void minify(int m) {
  for (int k = 1; k <= m; k++) {
    for (int i = 1; i <= m; i++) {
      for (int j = 1; j <= m; j++) {
        dist[i][j] = min(dist[i][j], dist[i][k] + dist[k][j]);
        cost[i][j] = min(cost[i][j], cost[i][k] + cost[k][j]);
      }
    }
  }
}

int query(int p, int q, int r) {
  if (r == 0) {
    return cost[p][q];
  } else {
    return dist[p][q];
  }
}

int main() {
  int n, m;
  while(cin >> n >> m and (n != 0 or m != 0)) {
    int a, b, c, d;
    initialize(m);

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

    minify(m);

    int k, p, q, r;
    cin >> k;

    for (int i = 0; i < k; i++) {
      cin >> p >> q >> r;
      cout << query(p, q, r) << endl;
    }
  }
}

C++: #include<cstdio>
#include<iostream>
#include<cstring>
#include<algorithm>
using namespace std;
#define INF 99999
int main(){
	while(1){
		int n,m;
		scanf("%d%d",&n,&m);
		if(n == 0 && m == 0)break;
		int D[128][128][2]={{{0}}};/*Adjacency matrix*/
		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] = D[to][from][0] = cst;
			D[from][to][1] = D[to][from][1] = tm;
		}
		
		for(int l = 0; l < 2; l++){
			for(int k = 1; k <= n; k++){
				for(int i = 1; i <= n; i++){
					for(int j = 1; j <= n; j++){
						D[i][j][l] = min(D[i][j][l],D[i][k][l] + D[k][j][l]);
					}
				}
			}
		}
		
		int k;
		scanf("%d",&k);
		for(int i = 0; i < k; i++){
			int from,to,x;
			scanf("%d%d%d",&from,&to,&x);
			printf("%d\n",D[from][to][x]);
		}
	}
	return 0;
}