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>
#include <vector>
#include <queue>
#include <map>
#define INF (int)1e9


void dijkstra(int m, int p, int q, std::vector<std::vector<std::pair<int, int> > > &v); 

int main(void) {
    int n;
    int m;
    int a;
    int b;
    int cost;
    int time;
    int k;
    int p;
    int q;
    int r;

    while (true) {
        std::cin >> n >> m;
        if (n == 0 && m == 0) {
            break; 
        }
        std::vector<std::vector<std::pair<int, int> > > vcost(m);
        std::vector<std::vector<std::pair<int, int> > > vtime(m);
        for (int i = 0; i < n; i++) {
            std::cin >> a >> b >> cost >> time;
            --a;
            --b;
            vcost[a].push_back(std::make_pair(cost, b));
            vcost[b].push_back(std::make_pair(cost, a));
            vtime[a].push_back(std::make_pair(time, b));
            vtime[b].push_back(std::make_pair(time, a));
        }
        std::cin >> k;
        for (int i = 0; i < k; i++) {
            std::cin >> p >> q >> r;
            --p;
            --q;
            if (r == 0) {
                dijkstra(m, p, q, vcost);
            } else {
                dijkstra(m, p, q, vtime);
            }
        }
    } return 0;
}

void dijkstra(int m, int p, int q, std::vector<std::vector<std::pair<int, int> > > &v) {
    std::vector<int> rvec(m, INF);
    rvec[p] = 0;
    std::priority_queue<std::pair<int, int>, std::vector<std::pair<int, int> >, std::greater<std::pair<int, int> > > pq;
    std::vector<int> search_count(m, 0);
    int start_value;
    int start_target;
    int end_value;
    int end_target;
    pq.push(std::make_pair(rvec[p], p));

    while(! pq.empty()) {
        start_target = pq.top().second;
        start_value = pq.top().first; 
        pq.pop();
        if (search_count[start_target] != 0) {
            continue;
        }
        ++search_count[start_target];
        for (int i = 0; i < v[start_target].size(); i++) {
            end_value = v[start_target][i].first;
            end_target = v[start_target][i].second;
            if (rvec[end_target] > end_value + rvec[start_target]) {
                rvec[end_target] = end_value + rvec[start_target];
                pq.push(std::make_pair(rvec[end_target], end_target));
            }
        }
    }
    std::cout << rvec[q] << std::endl;
    return;
}

C++: #include<iostream>
using namespace std;
int MAX=100000;
int main(){
  int n,m;
  cin>>n>>m;
  int a,b,cost,timer;
  int costs[m][m];
  int timers[m][m];
  for(int i=0;i<m;i++){
    for(int j=0;j<m;j++){
      costs[i][j]=MAX;
      timers[i][j]=MAX;
    }
    costs[i][i]=0;
    timers[i][i]=0;
  }

  for(int i=0;i<n;i++){
    cin>>a>>b>>cost>>timer;
    costs[a-1][b-1]=cost;
    timers[a-1][b-1]=timer;
    costs[b-1][a-1]=cost;
    timers[b-1][a-1]=timer;
  }
  /*
  cout<<endl<<endl<<endl;
  for(int i=0;i<m;i++){
    for(int j=0;j<m;j++){
      cout<<costs[i][j]<<"            ";
    }
    cout<<endl;
  }
  cout<<endl<<endl<<endl<<endl<<endl;*/
  for(int i=0;i<m;i++){
    for(int j=0;j<m;j++){
      for(int k=0;k<m;k++){
        if(costs[j][k]>(costs[j][i]+costs[i][k])){
          costs[j][k]=costs[j][i]+costs[i][k];
          costs[k][j]=costs[j][i]+costs[i][k];
        }
        if(timers[j][k]>(timers[j][i]+timers[i][k])){
          timers[j][k]=timers[j][i]+timers[i][k];
          timers[k][j]=timers[j][i]+timers[i][k];
        }
      }
    }
  }
  int k;
  int p;
  int q;
  bool r;
  cin>>k;
  for(int i=0;i<k;i++){
    cin>>p>>q>>r;
    if(r){
      cout<<timers[p-1][q-1]<<endl;
    }else if(!r){
      cout<<costs[p-1][q-1]<<endl;
    }
  }
  return 0;
}

C++: //AOJ 0200
//菴ソ縺?婿繧ゅｏ縺九ｉ縺ェ縺?¥縺帙↓include縺励∪縺上ｋ莠コ髢薙?繧ッ繧コ
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<algorithm>
#include<cmath>
#include<stack>
#include<queue>
#include<vector>
#include<list>
#include<deque>
using namespace std;
#define INF 1 << 30
#define MAX_B 101

int a, b, i, j, k, money[MAX_B][MAX_B], time[MAX_B][MAX_B], n, m, c, d;
bool judge;
stack<int> left, right;


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