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>
using namespace std;

const int INF = 1000000000;

int main()
{
	while(true){
		int n, m;
		cin >> n >> m;

		if(n==0 && m==0)
			break;

		int C[100][100];
		int T[100][100];
		for(int i=0; i<m; i++){
			for(int j=0; j<m; j++){
				if(i==j){
					C[i][j] = T[i][j] = 0;
				}
				else{
					C[i][j] = T[i][j] = INF;
				}
			}
		}

		for(int i=0; i<n; i++){
			int a, b, c, t;
			cin >> a >> b >> c >> t;

			C[a-1][b-1] = C[b-1][a-1] = c;
			T[a-1][b-1] = T[b-1][a-1] = t;
		}

        for(int l=0;l<m;l++){
            for(int i=0;i<m;i++){
                for(int j=0;j<m;j++){
                    if(C[i][j]>C[i][l]+C[l][j]){
                        C[i][j]=C[i][l]+C[l][j];
                    }
                        if(T[i][j]>T[i][l]+T[l][j]){
                        T[i][j]=T[i][l]+T[l][j];
                    }
                }
            }
        }
        
        int k;
        cin>>k;
        for(int i=0; i<k; i++){
            int p,q,r;
            cin>>p>>q>>r;
            if(r==0){
                cout<<C[p-1][q-1]<<endl;
            }else{
                cout<<T[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];
	    money[k][j] = 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];
	    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<bits/stdc++.h>
using namespace std;
const int INF = 1 << 28;


void Floyd_Warshall(vector< vector< int > >& graph){
  for(int k = 0; k < graph.size(); k++){
    for(int i = 0; i < graph.size(); i++){
      for(int j = 0; j < graph.size(); j++){
        graph[i][j] = min( graph[i][j], graph[i][k] + graph[k][j]);
      }
    }
  }
  return ;
}

int main() {
  int n, m;
  vector< vector< int > > graph1, graph2;

  cin >> n >> m;
  graph1.resize(m, vector< int >(m, INF));
  graph2.resize(n, vector< int >(m, INF));
  for(int i = 0; i < n; i++){
    int a, b, cost, time;
    cin >> a >> b >> cost >> time;
    --a, --b;
    graph1[a][b] = graph1[b][a] = cost;
    graph2[a][b] = graph2[b][a] = time;
  }
  Floyd_Warshall(graph1);
  Floyd_Warshall(graph2);

  int k;
  cin >> k;
  while(k--){
    int p, q, r;
    cin >> p >> q >> r;
    --p, --q;
    if(r == 0) cout << graph1[p][q] << endl;
    else cout << graph2[q][p] << endl;
  }

}

C++: #include <iostream>
#include <vector>
#define INF (int)1e9

void warshall_floyd(int m, int p, int q, std::vector<std::vector<int> > &dp) { 
    for (int i = 0; i < m; i++) {
        dp[i][i] = 0;
    }
    for (int k = 0; k < m; k++) {
        for (int i = 0; i < m; i++) {
            for (int j = 0; j < m; j++) {
                dp[i][j] = std::min(dp[i][j], dp[i][k] + dp[k][j]);
            }
        }
    }
    return;
}

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<int> > vcost(m, std::vector<int>(m, INF));
        std::vector<std::vector<int> > vtime(m, std::vector<int>(m, INF));

        for (int i = 0; i < n; i++) {
            std::cin >> a >> b >> cost >> time;
            --a;
            --b;
            vcost[a][b] = cost; 
            vcost[b][a] = cost; 
            vtime[a][b] = time; 
            vtime[b][a] = time; 
        }

        warshall_floyd(m, p, q, vcost); 
        warshall_floyd(m, p, q, vtime); 
        std::cin >> k;
        for (int i = 0; i < k; i++) {
            std::cin >> p >> q >> r;
            --p;
            --q;
            if (r == 0) {
                std::cout << vcost[p][q] << std::endl;            
            } else {
                std::cout << vtime[p][q] << std::endl;            
            }
        }
    } return 0;
}