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 <map>
#include <limits.h>
#include <queue>


#define INF INT_MAX

using namespace std;


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

vector<edge> ek[3002];
vector<edge> em[3002];
priority_queue<P,vector<P>,greater<P> >que;

int d[102];
int q,r;

void dik()
{
  while(!que.empty())
    {
      P p = que.top();
      que.pop();
      // cout<<p.first<<"  "<<p.second<<endl;
      int v=p.second;
      int h=p.first;
      if(v==q)
	break;
      for(int i=0;i<ek[v].size();i++)
	{
	  edge e;
	  if(r==0)
	    e=em[v][i];
	  else
	    e=ek[v][i];
	  if(d[e.to]>d[v] + e.cost)
	    {
	      d[e.to]=d[v]+e.cost;
	      que.push(P(d[e.to],e.to));
	    }
	  
	}
    }
  
}

int main()
{
  int n,m;
  for(;cin>>n>>m,n;)
    {
      //マップ初期化
      for(int i=0;i<3003;i++)
	{
	  ek[i].clear();
	  em[i].clear();
	}
      
      for(int i=0;i<n;i++)
	{
	//エッジ情報
	  int a,b,cost,time;
	  cin>>a>>b>>cost>>time;
	  edge xx;
	  xx.to=b;
	  xx.cost=cost;
	  em[a].push_back(xx);
	  xx.cost=time;
	  ek[a].push_back(xx);
	  
	}
      int c;
      cin>>c;
      for(;c--;)
	{
	  fill(d,d+102,INF);
	  //問い合わせ
	  int p;
	  cin>>p>>q>>r;
	  d[p]=0;
	  que.push(P(0,p));
	  dik();
	  cout<<d[q]<<endl;
	}
    }
}

C++: #include <iostream>
#include <vector>
#include <queue>
#define FOR(i,a,b) for(int i=(a); i<(b); i++)
#define pb push_back
using namespace std;

const int INF=10000000;
int V;
struct edge {
    int to,money,time;
};
struct state {
    int from, d;
    bool operator<(const state& a)const{
        return d>a.d;
    }
};
vector<vector<edge> > G;

int d[111];
int ds(int s,int g, int r){
    FOR(i,0,111)d[i]=INF;
    d[s]=0;
    priority_queue<state> q;
    q.push({s,0});
    while(q.size()){
        state sta=q.top();
        q.pop();
        int from=sta.from;
        FOR(i,0,G[from].size()){
            const edge& e=G[from][i];
            int to=e.to;
            int cost=r?e.time:e.money;
            if(d[to]>d[from]+cost){
                d[to]=d[from]+cost;
                q.push({to,d[to]});
            }
        }
    }
    return d[g];
}

int main(){
    int n;
    while(1){
        cin>>n>>V;
        if(!(n||V)) break;
        G=vector<vector<edge> >(n+1);
        FOR(i,0,n){
            int a,b,m,t;cin>>a>>b>>m>>t;
            G[a].pb({b,m,t});
            G[b].pb({a,m,t});
        }
        int k;cin>>k;
        FOR(i,0,k){
            int p,q,r;cin>>p>>q>>r;
            cout<<ds(p,q,r)<<endl;
        }
    }
}

C++: #include<iostream>
#include<queue>
#include<algorithm>
#include<utility>
#include<vector>
#include<climits>
using namespace std;

#define MAX_M 110

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

vector<edge> c[2][MAX_M];

int dijkstra(int s,int e,bool r){
	int d[MAX_M];
	for(int i=0;i<MAX_M;i++){
		d[i]=INT_MAX;
	}
	priority_queue<P,vector<P>,greater< P > > que;
	
	d[s]=0;
	
	que.push(P(0,s));
	
	while(!que.empty()){
		P p=que.top();que.pop();
		int v=p.second;
		if(d[v]<p.first) continue;
		for(int i=0;i<c[r][v].size();i++){
			edge e=c[r][v][i];
			if(d[e.to]>d[v]+e.cost){
				d[e.to]=d[v]+e.cost;
				que.push(P(d[e.to],e.to));
			}
		}
	}
	
	return d[e];
}

int main(){
	int n,m;
	while(cin>>n>>m,n!=0||m!=0){
		for(int r=0;r<2;r++){
			for(int i=0;i<MAX_M;i++){
				c[r][i].clear();
			}
		}
		for(int i=0;i<n;i++){
			int a,b,cos,tim;
			cin>>a>>b>>cos>>tim;
			edge co,t;
			co.to=b;co.cost=cos;
			t.to=b;t.cost=tim;
			c[0][a].push_back(co);
			c[1][a].push_back(t);
		}
		cin>>n;
		for(int i=0;i<n;i++){
			int s,e;
			bool r;
			cin>>s>>e>>r;
			int ans=dijkstra(s,e,r);
			cout<<ans<<endl;
		}
	}
}

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

using namespace std;

int i, j, k, p, q, r, n, m, a, b, c, cost[101], t, dc[101][101], dt[101][101];

int dic(const int d[101][101]) {
  cost[p] = 0;
  int min, f[101] = {};
  for(i = 0; i < m; i++) {
    f[p] = 1;
    for(j = 0; j <= m; j++) {
      if(f[j]) continue;
      if(cost[j] > cost[p] + d[p][j]) cost[j]  = cost[p] + d[p][j];
    }
    min = 200000000;
    for(j = 0; j <= m; j++ ) {
      if(f[j]) continue;
      if(min > cost[j]) min = cost[p = j];
    }
  }
  return cost[q];
}


int main() {
  while(cin >> n >> m, n != 0 || m != 0) {
    for(i = 0; i <= 100; i++)
      for(j = 0; j <= 100; j++) {
	dc[i][j] = 100000000;
	dt[i][j] = 100000000;
      }
  

  
    while(n--) {
      cin >> a >> b >> c >> t;
      dc[a][b] = dc[b][a] = c;
      dt[a][b] = dt[b][a] = t;
    }
  
    cin >> k;
    
    while(k--) {
      cin >> p >> q >> r;
      for(i = 0; i <= 100; i++) cost[i] = 100000000;
      if(r) cout << dic(dt) << endl;
      else cout << dic(dc) << endl;
    }
  
  }
  return 0;
}