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++: #include<cstdio>
#include<iostream>
#include<cmath>
#include<queue>

#define NMAX 3000
#define MMAX 100
#define TMAX 1000
#define CMAX 1000
#define KMAX 200

using namespace std;

int main(){
	std::ios_base::sync_with_stdio(false);

	int n,m;
	int a,b,time,cost;
	int data[MMAX][MMAX][2];
	int k;
	int p,q,r;
	int dp[MMAX];
	queue<int> now;

	while(1){
		for(int i=0;i<MMAX;i++){
			for(int j=0;j<MMAX;j++){
				for(int k=0;k<2;k++){
					data[i][j][k]=-1;
				}
			}
		}

		for(int i=0;i<MMAX;i++){
			dp[i]=-1;
		}

		cin>>n>>m;
		if(n==0&&m==0) break;
		for(int i=0;i<n;i++){
			cin>>a>>b>>cost>>time;
			data[a][b][1]=time;
			data[b][a][1]=time;
			data[a][b][0]=cost;
			data[b][a][0]=cost;
		}

		cin>>k;
		for(int i=0;i<k;i++){
			cin>>p>>q>>r;
			now.push(p);
			dp[p]=0;
			while(!now.empty()){
				for(int i=0;i<n;i++){
					if(data[now.front()][i][r]!=-1){
						if(dp[i]==-1||dp[i]>dp[now.front()]+data[now.front()][i][r]){
							dp[i]=dp[now.front()]+data[now.front()][i][r];
							now.push(i);
						}
					}
				}
				now.pop();
			}
			cout<<dp[q]<<endl;
		}

	}



	return 0;
}

C++: #include <iostream>
using namespace std;

const int INF = 1000000000;

int main()
{
	while(false){
		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;
    }

    int k;
    cin>>k;
    for(int k=0;k<m;k++){
      for(int i=0;i<m;i++){
        for(int j=0;j<m;j++){
          if(d[i][j]>d[i][k]+d[k][j]){
            d[i][j]=d[i][k]+d[k][j];
          }
        }
      }
    }
    for(int i=0;i<k;i++){
      int p, q, r;
      int a=0;
      cin>>p>>q>>r;
      int d[m][m];
      if(r==0){
        for(int i=0;i<m;i++){
          for(int j=0;j<m;j++){
            d[i][j]=C[i][j];
          }
        }
        a=d[p-1][q-1];
        cout<<a<<endl;
      }
      if(r==1){
        for(int i=0;i<m;i++){
          for(int j=0;j<m;j++){
            d[i][j]=T[i][j];
          }
        }
        a=d[p-1][q-1];
        cout<<a<<endl;
      }
    }
	}

	return 0;
}

C++: #include <iostream>
#include <algorithm>

using namespace std;

int main(int argc, char **argv)
{
  int c[101][101], t[101][101], n, m, a, b, u, v;

  while(1){
    cin >> n >> m;

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

    fill(&c[1][1], &c[m][m], 99999);
    fill(&t[1][1], &t[m][m], 99999);

    for(int i = 1; i <= m; i++){
      c[i][i] = t[i][i] = 0;
    }

    for(int i = 0; i < n; i++){
      cin >> a >> b >> u >> v;
      c[a][b] = c[b][a] = u;
      t[a][b] = t[b][a] = v;
    }

    for(int k = 1; k <= m; k++){
      for(int i = 1; i <= m; i++){
	for(int j = 1; j <= m; j++){
	  c[i][j] = (c[i][j] < c[i][k]+c[k][j])? c[i][j] : c[i][k]+c[k][j];
	  t[i][j] = (t[i][j] < t[i][k]+t[k][j])? t[i][j] : t[i][k]+t[k][j];
	}
      }
    }
    cin >> n;
    while(n--){
      cin >> a >> b >> u;
      if(u == 0){
	cout << c[a][b] << endl;
      } else {
	cout << t[a][b] << endl;
      }
    }
  }

  return 0;
}

C++: #include <iostream>

using namespace std;

const int MAX_N = 110;
const int INF = 10000;
int d_cost[MAX_N][MAX_N];
int d_time[MAX_N][MAX_N];
int n, m;

void warshall_floyd(int d[MAX_N][MAX_N])
{
    for (int k = 0; k < m; k++)
        for (int i = 0; i < m; i++)
            for (int j = 0; j < m; j++)
                d[i][j] = min(d[i][j], d[i][k] + d[k][j]);
}

int main()
{
    while (cin >> n >> m, n || m) {
        int a, b, cost, time;
        int k, p, q, r;

        // 初期化
        for (int i = 0; i < n; i++)
            for (int j = 0; j < n; j++) {
                if (i == j) 
                    d_cost[i][j] = d_time[i][j] = 0;
                else
                    d_cost[i][j] = d_time[i][j] = INF;
            }

        for (int i = 0; i < n; i++) {
            cin >> a >> b >> cost >> time;
            a--, b--;
            d_cost[a][b] = d_cost[b][a] = cost;
            d_time[a][b] = d_time[b][a] = time;
        }
        warshall_floyd(d_cost);
        warshall_floyd(d_time);

        cin >> k;
        for (int i = 0; i < k; i++) {
            cin >> p >> q >> r;

            p--, q--;
            if (r == 0)
                cout << d_cost[p][q] << endl;
            else
                cout << d_time[p][q] << endl;
        }
    }

    return 0;
}

C++: #include<iostream>

using namespace std;

int main(){
  int n,m,x,y,cost,time,p,q,r;
  while(true){
    cin >> n >> m;
    if(n+m == 0)break;
    int matrix1[n+2][n+2],matrix2[n+2][n+2];
    for(int i=0;i<n+2;i++){
      for(int j=0;j<n+2;j++){
	matrix2[i][j] = matrix1[i][j] = 1000000;
      }
    }
    for(int i=0;i<n;i++){
      cin >> x >> y >> cost >> time;
      matrix1[x][y] = matrix1[y][x] = cost;
      matrix2[y][x] = matrix2[x][y] = time;
    }
    for(int k=1;k<=n;k++){
      for(int i=1;i<=n;i++){
	for(int j=1;j<=n;j++){
	  matrix1[i][j] = min(matrix1[i][j],matrix1[i][k]+matrix1[k][j]);
	  matrix2[i][j] = min(matrix2[i][j],matrix2[i][k]+matrix2[k][j]);

	}
      }
    }


    int k;
    cin >> k;
    for(int i=0;i<k;i++){
      cin >> p >> q >> r;
      if(r == 0){
	cout << matrix1[p][q] << endl;
      }
      else{
	cout << matrix2[p][q] << endl;
      }

    }

  }
  return 0;
}