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++: //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[k][j] = money[j][i] + money[i][k];
	  }
	  if(time[j][k] > time[j][i] + time[i][k]){
	    time[j][k] = time[k][j] = 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;
}

C++: #include<iostream>

#define INF 1001;
using namespace std;


int main(){
  int n,m;
  while(1){
    cin>>n>>m;
    if(n==0&&m==0){break;}
    int s_tim[m][m];
    int c_money[m][m];
    int a,b,cost,tim;

    for(int i=0;i<m;i++){
      for(int j=0;j<n;j++){
        s_tim[i][j]=INF;
        c_money[i][j]=INF;
      }
    }
    for(int i=0;i<m;i++){
      s_tim[i][i]=0;
      c_money[i][i]=0;
    }
    for(int i=0;i<n;i++){
      cin>>a>>b>>cost>>tim;
      s_tim[a-1][b-1]=tim;s_tim[b-1][a-1]=tim;
      c_money[a-1][b-1]=cost;c_money[b-1][a-1]=cost;
    }

    for(int k=0;k<m;k++){
      for(int i=0;i<m;i++){
        for(int j=0;j<m;j++){
          if(s_tim[i][j]>s_tim[i][k]+s_tim[k][j]){
            s_tim[i][j]=s_tim[i][k]+s_tim[k][j];
          }
          if(c_money[i][j]>c_money[i][k]+c_money[k][j]){
            c_money[i][j]=c_money[i][k]+c_money[k][j];
          }
        }
      }
    }

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

    for(int i=0;i<contacts;i++){
      cin>>p>>q>>r;
      if(r){cout<<s_tim[p-1][q-1];}
      else{ cout<<c_money[p-1][q-1];}
      cout<<endl;
    }
  }
}

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 thisNodesIsFixed;
};

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 i = 0; i < N; i++)
	{
		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 K;
	cin >> K;
	for(int i = 0; i < K; i++)
	{
		for(int j = 0; j < nodesList.size(); j++)
		{
			nodesList[j].minValue = -1;
			nodesList[j].thisNodesIsFixed = false;
		}
		int Start;
		int End;
		int mode;
		vector<int> candidateNodes;
		
		cin >> Start >> End;
		cin >> mode;

		nodesList[Start - 1].minValue = 0;
		nodesList[Start - 1].thisNodesIsFixed = true;
		candidateNodes.push_back(Start);
		int minValue = 1001;
		while(1)
		{
			minValue = 1001;
			int nextNodesName = -1;
			//????¢???????????????????????????????????¬?????¢???????????????????????????¢??????
			for(int j = 0; j < candidateNodes.size(); j++)
			{
				for(int k = 0; k < nodesList[candidateNodes[j] - 1].nextNodes.size(); k++)
				{
					if(nodesList[nodesList[candidateNodes[j] - 1].nextNodes[k].nextNodesName - 1].thisNodesIsFixed == true)
					{
						continue;
					}

					int value;
					value = 0;
					if(mode == 0)
					{
						value = nodesList[candidateNodes[j]-1].minValue;
						value += nodesList[candidateNodes[j]-1].nextNodes[k].nextNodesMany;
					}
					else
					{
						value = nodesList[candidateNodes[j] - 1].minValue;
						value += nodesList[candidateNodes[j] - 1].nextNodes[k].nextNodesTime;
					}
					if(value < minValue)
					{
						minValue = value;
						nextNodesName = nodesList[candidateNodes[j] - 1].nextNodes[k].nextNodesName;
					}

				}
			}
			//???????????§??§????¬?????¢??????????????????????????±????

			nodesList[nextNodesName - 1].minValue = minValue;
			candidateNodes.push_back(nextNodesName);
			nodesList[nextNodesName - 1].thisNodesIsFixed = true;
			if(nextNodesName == End)
			{
				break;
			}
		}
		cout << nodesList[End - 1].minValue << endl;


	}


}