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 <iostream>
#include <vector>
#include <cmath>
#include <queue>

#define INF (10000000)
#define MAX (100)

using namespace std;

struct edge { int to, cost; };
typedef pair<int, int> P;

vector<edge> T[MAX+1],C[MAX+1];
int dist[MAX+1];


int dijkstra_c(int s, int g)
{
    priority_queue<P, vector<P>, greater<P> > que;
    fill(dist, dist + MAX + 1, INF);
    dist[s] = 0;
    que.push(P(0, s));

    while(!que.empty()) {
        P p = que.top(); que.pop();
        int v = p.second;
        if(dist[v] < p.first) continue;
        for(int i = 0; i < C[v].size(); i++) {
            edge e = C[v][i];
            if(dist[e.to] > dist[v] + e.cost) {
                dist[e.to] = dist[v] + e.cost;
                que.push(P(dist[e.to], e.to));
            }
        }
    }
    return dist[g];
}

int dijkstra_t(int s, int g)
{
    priority_queue<P, vector<P>, greater<P> > que;
    fill(dist, dist + MAX + 1, INF);
    dist[s] = 0;
    que.push(P(0, s));

    while(!que.empty()) {
        P p = que.top(); que.pop();
        int v = p.second;
        if(dist[v] < p.first) continue;
        for(int i = 0; i < T[v].size(); i++) {
            edge e = T[v][i];
            if(dist[e.to] > dist[v] + e.cost) {
                dist[e.to] = dist[v] + e.cost;
                que.push(P(dist[e.to], e.to));
            }
        }
    }
    return dist[g];
}


int main()
{
    int n, m;
    while(cin >> n >> m && n) {
        for(int i = 0; i <= MAX; i++) {
            C[i].clear(); T[i].clear();
        }

        int a,b,c,t;
        for(int i = 0; i < n; i++) {
            cin >> a >> b >> c >> t;
            C[a].push_back((edge){b, c});
            C[b].push_back((edge){a, c});
            T[a].push_back((edge){b, t});
            T[b].push_back((edge){a, t});
        }
        
        int k,p,q,r;
        cin >> k;
        for(int i = 0; i < k; i++) {
            cin >> p >> q >> r;
            if(r == 0) cout << dijkstra_c(p, q) << endl;
            else       cout << dijkstra_t(p, q) << endl;
        }
    }
    return 0;
}

C++: #include<iostream>
using namespace std;
#define rep(i,a) for(int i=0;i<a;i++)
int main(void){
  int maze[2][100][100];
  int n,m;
  int a,b,c,t;
  while(cin>>m>>n,n+m){
    rep(i,n)rep(j,n)rep(k,2)maze[k][i][j]=100000;
    rep(i,m){
      cin>>a>>b>>c>>t;
      maze[0][--a][--b]=c;
      maze[1][a][b]=t;
      maze[0][b][a]=c;
      maze[1][b][a]=t;
    }
    rep(k,n)rep(i,n)rep(j,n)rep(l,2)
      maze[l][i][j]=min(maze[l][i][j],maze[l][i][k]+maze[l][k][j]);
    cin>>m;
    cout<<endl;rep(i,n)rep(j,n)cout<<maze[1][i][j]<<(j==n-1?'\n':' ');
    
    rep(i,m){
      cin>>a>>b>>c;
      cout<<maze[c][--a][--b]<<endl;
    }
  }
}

C++: // 2014/06/16 Tazoe

#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 i=0;i<n;i++){
      for(int j=0;j<n;j++){
        for(int k=0;k<n;k++){
          if(C[i][j] > C[i][k]+C[k][j])
            C[i][j] = C[i][k] + C[k][j];
          if(T[i][j] > T[i][k]+T[k][j])
            T[i][j] = T[i][k] + T[k][j];
        }
      }
    }
    unsigned int k;
    for(int i=0;i<k;i++){
      int p,q,r;
      cin >> p >> q;
      if(k == 0  &&  q == 0)
        return 0;
      cin >> r;

      if(r==0){
        cout << C[p][q] << endl;
      } else {
        cout << T[p][q] << endl;
      }
    }

	}

	return 0;
}

C++: #include <iostream>
#include <stdio.h>
#include <sstream>
#include <string>
#include <vector>
#include <map>
#include <queue>
#include <algorithm>
#include <set>
#include <math.h>
#include <utility>
#include <stack>
#include <string.h>
using namespace std;
typedef pair<int,int> P;
const int INF = ~(1<<31) / 2;
 
int c[100][100];
int t[100][100];
int n,m,k;
 
int main(){
    while(1){
        scanf("%d %d",&n,&m);
        if(n==0) break;
        for(int i=0;i<m;i++){
            for(int j=0;j<m;j++){
                c[i][j] = 1000000;
                t[i][j] = 1000000;
            }
        }
        for(int i=0;i<n;i++){
            int a,b,co,ti;
            scanf("%d %d %d %d",&a,&b,&co,&ti);
            a--;b--;
            c[a][b] = co;
            c[b][a] = co;
            t[a][b] = ti;
            t[b][a] = ti;
        }
 
        for(int k=0;k<m;k++){
            for(int i=0;i<m;i++){
                for(int j=0;j<m;j++){
                    c[i][j] = min(c[i][j],c[i][k]+c[k][j]);
                    t[i][j] = min(t[i][j],t[i][k]+t[k][j]);
                }
            }
        }
 
        scanf("%d",&k);
        for(int i=0;i<k;i++){
            int p,q,r;
            scanf("%d %d %d",&p,&q,&r);
            p--;q--;
            if(r)printf("%d\n",t[p][q]);
            else printf("%d\n",c[p][q]);
        }
    }
    return 0;
}