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>
using namespace std;
class NextNodesData
{
public:	
	int nextNodesName;
	int nextNodesMany;
	int nextNodesTime;
};
class Nodes
{
public:
	vector<NextNodesData> nextNodes;
	int name;
	int minValue;
	bool fixed;
};

int main()
{
	int N, M;
	cin >> N >> M;
	vector<Nodes> nodesList;
	for(int i = 0; i < M; i++)
	{
		Nodes nodes;
		nodes.name = i+1;
		nodesList.push_back(nodes);
	}
	for(int j = 0; j < N; j++)
	{
		int Start;
		int End;
		int Many;
		int Time;
		cin >> Start >> End >> Many >> Time;

		NextNodesData nodes;
		nodes.nextNodesName = End;
		nodes.nextNodesMany = Many;
		nodes.nextNodesTime = Time;
		nodesList[Start - 1].nextNodes.push_back(nodes);
	}

	int Query;
	cin >> Query;

	for(int k = 0; k < Query; k++) 
	{
		
		 //???????????????
		for(int l = 0; l < nodesList.size(); l++)
		{
			nodesList[l].fixed = false;
		}
		int Start;
		int End;
		int mode;
		
		cin >> Start >> End;
		cin >> mode;

		if(Start == End)
		{
			cout << 0 << endl;
			continue;
		}

		nodesList[Start - 1].fixed = true;
		nodesList[Start - 1].minValue = 0;
		int nextFixedNodesName = Start;

		

		vector<Nodes> candidate;
		while(1)
		{
			//??????????¢????????????°??????????´????????????????????????¨???????????????????????????
			for(int m = 0; m < nodesList[nextFixedNodesName - 1].nextNodes.size(); m++)
			{
				Nodes obj;
				obj.name = nodesList[nextFixedNodesName - 1].nextNodes[m].nextNodesName;
				//??¢??????????????????????????????????????????????????????
				if(nodesList[obj.name - 1].fixed == true)
				{
					continue;
				}
				if(mode == 0)
				{
					obj.minValue = nodesList[nextFixedNodesName - 1].minValue + nodesList[nextFixedNodesName - 1].nextNodes[m].nextNodesMany;
				}
				else
				{
					obj.minValue = nodesList[nextFixedNodesName - 1].minValue + nodesList[nextFixedNodesName - 1].nextNodes[m].nextNodesTime;
				}
				//?¬???????????????????????????????????????????
				candidate.push_back(obj);				   
			}

			int minValue = 10000001;
			int minName  = -1;
			//?¬????????????????????£???????????°???????????????¢???
			for(int n = 0; n < candidate.size(); n++)
			{
				if(candidate.size() == 0)
				{
					cout << 0 << endl;
				}
				if(candidate[n].minValue < minValue)
				{
					minValue = candidate[n].minValue;
					minName = candidate[n].name;
				}  
			}
			if(minName == End)
			{
				cout << minValue << endl;
				break;
			}
			nodesList[minName - 1].minValue = minValue;
			nodesList[minName - 1].fixed = true;
			nextFixedNodesName = minName;

			
			for(auto itr = candidate.begin(); itr != candidate.end();)
			{
				if(nodesList[itr->name - 1].fixed == true)
				{
					itr = candidate.erase(itr);
				}
				else
				{
					itr++;
				}
			}
		}	
		

	} 

	return 0;

}

C++: //2013-5

#include <iostream>
#include <fstream>
#include <cstdio>
#include <vector>
#include <queue>
#include <stack>
#include <map>
#include <algorithm>
#include <time.h>
#define mp make_pair
#define INF 1e8
#define fs first
#define sc second
#define rep(x,n) for(int x = 0;x < n;x ++)
#define Rep(x,n) for(int x = 1;x <= n;x ++)
using namespace std;

int d[2][105][105]; //行き先、cost...0 time...1

int main(){
    int n,m;
    while(scanf("%d %d",&n,&m),(n!=0||m!=0)){

    rep(i,m){
        rep(j,m){
            d[0][i][j]=INF;
            d[1][i][j]=INF;
        }
    }
    rep(i,m){
        d[0][i][i]=0;
        d[1][i][i]=0;
    }

    rep(i,n){
        int a,b,cost,time;
        scanf("%d %d %d %d",&a,&b,&cost,&time);
        a--;b--;
        d[0][a][b]=cost;
        d[0][b][a]=cost;
        d[1][a][b]=time;
        d[1][b][a]=time;
    }
    
    
    rep(i,2){
        rep(j,m){
            rep(k,m){
                rep(l,m){
                    d[i][k][l]=min(d[i][k][l],d[i][k][j]+d[i][j][l]);
                    if(d[i][k][l]>INF)
                        d[i][k][l]=INF;
                }
            }
        }
    }
    
    int k;
    scanf("%d",&k);
    rep(i,k){
        int p,q,r;
        scanf("%d %d %d",&p,&q,&r);
        p--;q--;
        printf("%d\n",d[r][p][q]);
    }
    }
}

C++: #include <cstdio>
#include <vector>

using namespace std;

const int INF = 99999999;

class Edge{
public:
  int from,to,cost,time;
  void swap(){
    int self = from;
    from = to;
    to = self;
  }
  int getvalue(int r){
    if(r == 0){
      return cost;
    }else{
      return time;
    }
  }
};

vector<Edge> edge;
int n,m;

int solve(const int p,const int q,const int r);

int main(){
  edge.clear();
  while(1){
    edge.clear();
    scanf("%d %d",&n,&m);
    if(n==0 && m==0){ break; }
    for(int i=0;i<n;i++){
      Edge ed;
      scanf("%d %d %d %d",&ed.from,&ed.to,&ed.cost,&ed.time);
      edge.push_back(ed);
      ed.swap();
      edge.push_back(ed);
    }
    
    int k;
    scanf("%d",&k);
    for(int i=0;i<k;i++){
      int p,q,r;
      scanf("%d %d",&p,&q);
      if(p==0 && q==0){
        return 0;
      }
      scanf("%d",&r);
      printf("%d\n",solve(p,q,r));
    }
  }
  return 0;
}

int solve(const int p,const int q,const int r){
  int *a = new int[m+1];
  for(int i=0;i<=m;i++){
    a[i] = INF;
  }
  a[p] = 0;
  bool update;
  while(true){
    update = false;
    vector<Edge>::iterator it = edge.begin();
    while(it != edge.end()){
      if(a[(*it).from] != INF && a[(*it).to] > a[(*it).from] + (*it).getvalue(r)){
        a[(*it).to] = a[(*it).from] + (*it).getvalue(r);
        update = true;
      }
      it++;
    }
    if(!update){
      break;
    }
  }
  
  int ans = a[q];
  return a[q];
}