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()
{
  int count=0;
	while(count=50){
		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 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];
          }
        }
        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];
              }
            }
          }
        }
        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];
          }
        }
        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];
              }
            }
          }
        }
        a=d[p-1][q-1];
        cout<<a<<endl;
      }
    }
    count++;
	}

	return 0;
}

C++: #include<iostream>
#include<algorithm>
const int INF = 10000000;
const int N = 101;
int cost[N][N];
int tim[N][N];
using namespace std;
int main()
{
	int n, m, a, b, co, ti,r;
	while (1){
		cin >> n >> m;
		if (n == 0 && m == 0)break;
		for (int i = 0; i < n; i++){
			for (int i2 = 0; i2 < n; i2++){
				cost[i][i2] = INF;
				tim[i][i2] = INF;
			}
		}
		for (int i = 0; i < n; i++){
			cin >> a >> b >> co >> ti;
			cost[a][b] = co;
			cost[b][a] = co;
			tim[a][b] = ti;
			tim[b][a] = ti;
		}
		for (int k = 0; k < m+1; ++k)
			for (int i = 0; i < m+1; ++i)
				for (int j = 0; j < m+1; ++j)
				{
					cost[i][j] = min(cost[i][j], cost[i][k] + cost[k][j]);
					tim[i][j] = min(tim[i][j], tim[i][k] + tim[k][j]);
				}
		cin >> m;
		for (int i = 0; i < m; i++){
			cin >> a >> b >> r;
			if (r == 0){
				cout << cost[a][b] << endl;
			}
			else
				cout << tim[a][b] << endl;
		}
	}
}

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

using namespace std;

#define inf 1000000000

int n,m;
int C[101][101];
int T[101][101];

class S{
	public:
	int iti,now;
	S(){}
	S(int a,int b){iti=a;now=b;}
	bool operator < (const S &a)const{
		return now>a.now;
	}
};
int dike(int st,int en,int va){
	priority_queue<S> state;
	int sima[101];
	for(int i=0;i<101;i++){
		sima[i]=inf;
	}
	state.push(S(st,0));
	sima[st]=0;
	while(1){
		S u;
		u=state.top();
		state.pop();
		
		if(u.iti==en){
			return u.now;
		}
		
		
		for(int i=1;i<=m;i++){
			
			if(C[u.iti][i]==inf){
				
				continue;
			}
			
			if(u.now+C[u.iti][i] < sima[i]){
				int cost=C[u.iti][i];
				if(va==1){
					cost=T[u.iti][i];
				}
				sima[u.iti]=u.now+cost;
				state.push(S(i,sima[u.iti]));
			}
		}
	}
}

int main(){
	while(1){
		cin>>n>>m;
		if(n==0)break;
		for(int i=0;i<101;i++){
			for(int j=0;j<101;j++){
				C[i][j]=inf;
				T[i][j]=inf;
			}
		}
		for(int i=0;i<n;i++){
			int a,b,c,d;
			cin>>a>>b>>c>>d;
			C[a][b]=C[b][a]=c;
			T[a][b]=T[b][a]=d;
		}
		
		int l;
		cin>>l;
		for(int i=0;i<l;i++){
			int a,b,c;
			cin>>a>>b>>c;
			printf("%d\n",dike(a,b,c));
		}
	}
}

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

#define MAX 1000000
#define n_MAX 101

int main() {

  while( true ) {

    long long int n, m;
    cin >> m >> n;
    if ( n == 0 ) break;

    long long int c[n_MAX][n_MAX], t[n_MAX][n_MAX];

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

    for ( long long int i = 0; i < m; i++ ) {

      long long int a, b;
      cin >> a >> b;
      cin >> c[a][b] >> t[a][b];
      c[b][a] = c[a][b];
      t[b][a] = t[a][b];

    }

    for ( int i = 1; i <= n; i++ ) {
      for ( int j = 1; j <= n; j++ ) {
	for ( int k = 1; k <= n; k++ ) {
	  c[j][k] = min( c[j][k], c[j][i] + c[i][k] );
	  t[j][k] = min( t[j][k], t[j][i] + t[i][k] );
	}
      }
    }

    long long int in;
    cin >> in;

    for ( long long int i = 0; i < in; i++ ) {

      long long int p, q, r;
      cin >> p >> q >> r;
      if ( r == 0 ) {
	cout << c[p][q] << endl;
      }else {
	cout << t[p][q] << endl;
      }

    }

  }

  return 0;

}