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<stdio.h>

int dijkstra(short int,short int,short int,short int,short int**);

int main(void)
{
	short int f1, f2, n, m, a, b, ic, ti, k, p, q, r, out, **cost, **time;

	while(scanf("%d %d",&n,&m) && n > 0)
	{

		cost = new int *[m];
		time = new int *[n];
		//線路設計
		for(f1 = 0; f1 < n; f1++)
		{
			cost[f1] = new int [m];
			time[f1] = new int [m];
			for(f2 = 0; f2 < m; f2++)
			{
				cost[f1][f2] = 0;
				time[f1][f2] = 0;
			}
		}
		//線路情報入力
		for(f1 = 0; f1 < n; f1++)
		{
			scanf("%d %d %d %d",&a, &b, &ic, &ti);
			a--;
			b--;
			cost[a][b] = ic;
			cost[b][a] = ic;
			time[a][b] = ti;
			time[b][a] = ti;
		}
		//問い合わせ入力
		scanf("%d",&k);
		for(f1 = 1; f1 <= k; f1++)
		{
			scanf("%d %d %d",&p, &q, &r);
			p--;
			q--;
			if(r == 0)
				out = dijkstra(n, m, p, q, cost);
			else
				out = dijkstra(n, m, p, q, time);

			printf("%d\n",out);
		}
	}
	return 0;
}

int dijkstra(short int n,short int m,short int p,short int q,short int **temp)
{
	int *C, *sum, f1, po = p, min;
	//Cの中身　0：出発していない　1：出発した
	C = new int [m];
	sum = new int [m];
	//初期化
	for(f1 = 0; f1 < m; f1++)
	{
		C[f1] = 0;
		sum[f1] = 0;
	}
	//ダイクストラ探索
	while(po != q)
	{
		//現在いる地点から次の駅までにかかるコストを計算し次に行く駅の現時点での最小コストを求める
		for(f1 = 0; f1 < m; f1++)
		{
			if(temp[po][f1] > 0)
			{
				if(C[f1] == 0 && (sum[f1] == 0 || temp[po][f1] + sum[po] < sum[f1]))
					sum[f1] = temp[po][f1] + sum[po];
			}
		}
		//出発していない駅の中で最小コストを選択する
		min = 0;
		C[po] = 1;
		for(f1 = 0; f1 < m; f1++)
		{
			if(C[f1] == 0 && sum[f1] != 0 && (min == 0 || sum[f1] < min))
			{
				min = sum[f1];
				po = f1;
			}
		}
	}
	return sum[q];
}

C++: #include <iostream>

using namespace std;

const int INF = 1000000;
int C[101][101], T[101][101];

int main() {
  for (;;) {
    int n, m;
    cin >> n >> m;
    if (!n && !m) return 0;
    for (int i = 1; i <= n; i++)
      for (int j = 1; j <= n; j++)
        C[i][j] = T[i][j] = INF;
    for (int i = 0; i < n; i++) {
      int a, b, cost, time;
      cin >> a >> b >> cost >> time;
      C[a][b] = C[b][a] = cost;
      T[a][b] = T[b][a] = time;
    }
    for (int k = 1; k <= n; k++)
      for (int i = 1; i <= n; i++)
        for (int j = 1; j <= n; j++) {
          C[i][j] = min(C[i][j], C[i][k] + C[k][j]);
          T[i][j] = min(T[i][j], T[i][k] + T[k][j]);
        }
    int k;
    cin >> k;
    for (int i = 0; i < k; i++) {
      int p, q, r;
      cin >> p >> q >> r;
      cout << (!r ? C[p][q] : T[p][q]) << endl;
    }
  }
  return 0;
}

C++: #include<cmath>
#include<cctype>
#include<cstdlib>
#include<cstdio>
#include<climits>
#include<iostream>
#include<algorithm>
#include<vector>
#include<deque>
#include<string>
#include<queue>
#include<map>
#include<set>
#include<utility>
#include<queue>

using namespace std;
int n,m;
const int MAXN = 101;
int t[MAXN][MAXN];
int c[MAXN][MAXN];

void solve(){
  for(int k = 0;k < n; ++k){
    for(int i = 0;i < n; ++i){
      for(int j = 0;j < n; ++j){
	t[i][j] = min(t[i][j],t[i][k] + t[k][j]);
	c[i][j] = min(c[i][j],c[i][k] + c[k][j]);
      }
    }
  }
}
const int INF = INT_MAX/3;
void init(){
  for(int i = 0;i < n; ++i){
    for(int j = 0;j < n;j++){
      c[i][j] = t[i][j] = INF;
    }
  }
  for(int i = 0;i < n;i++){
    c[i][i] = t[i][i] = 0;
  }
}


int main(){
  ios::sync_with_stdio(false);

  while(cin >> n >> m && n+m > 0){
    init();
    int a,b,icost,itime;
    for(int i = 0;i < n;i++){
      cin >> a >> b >> icost >> itime;
      t[a][b] = t[b][a] = itime;
      c[a][b] = c[b][a] = icost;
    }
    solve();
    int k;
    cin >> k;
    for(int i = 0;i < k; ++i){
      int p,q,r;
      cin >> p >> q >> r;
      if(r == 1){
	cout << t[p][q] << endl;
      }else{
	cout << c[p][q] << endl;
      }
    }
  }
  return 0;
}