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>
#include <string>
#include <algorithm>
#include <math.h>
#include <vector>
#include <set>

using namespace std;
typedef long long LL;
static const double EPS = 1e-9;

#define FOR(i,k,n) for (int i=(k); i<(int)(n); ++i)
#define REP(i,n) FOR(i,0,n) 

int main(void){  
  int cost[100][100]={0};
  int time[100][100]={0};
  int n,m,a,b,c,t,h,p,q,r;
  while(cin >> n >> m,n){
    REP(i,n){
    cin >> a >> b >> c >> t;
    cost[a-1][b-1] = cost[b-1][a-1] = c;
    time[a-1][b-1] = time[b-1][a-1] = t;
  }
  REP(i,m)
    REP(j,m){
      if(!cost[i][j]&&i!=j) cost[i][j] = 1000000000;
      if(!time[i][j]&&i!=j) time[i][j] = 1000000000;
    }
  REP(k,m)
    REP(i,m)
      REP(j,m){
        cost[i][j] = min(cost[i][j],cost[i][k] + cost[k][j]);
        time[i][j] = min(time[i][j],time[i][k] + time[k][j]);
      }
  cin >> h;
  REP(i,h){
    cin >> p >> q >> r;
    if(r==0) cout << cost[p-1][q-1] << endl;
    else cout << time[p-1][q-1] << endl;
  }
  }
  return 0;
}

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

using namespace std;

const int INF = 99999999;


int main(void)
{
	int n,m;
	int cost[101][101];
	int time[101][101];

	while( cin >> n >> m && n != 0 ){
		for( int i = 0;i < 101;i++ ){
			for( int j = 0;j < 101;j++ ){
				cost[i][j] = time[i][j] = INF;
			}
		}

		for( int i = 0;i < 101;i++ ){
			cost[i][i] = time[i][i] = 0;
		}

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

			cin >> a >> b >> c >> d;

			cost[a][b] = c;
			cost[b][a] = c;
			time[a][b] = d;
			time[b][a] = d;
		}

		for( int k = 1;k <= m;k++ ){
			for( int i = 1;i <= m;i++ ){
				if( cost[i][k] != INF ){
					for( int j = 1;j <= m;j++ ){
						cost[i][j] = min( cost[i][j], cost[i][k] + cost[k][j] );
					}
				}
				if( time[i][k] != INF ){
					for( int j = 1;j <= m;j++ ){
						time[i][j] = min( time[i][j], time[i][k] + time[k][j] );
					}
				}
			}
		}

		int k;

		cin >> k;

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

			cin >> p >> q >> r;

			if( r == 0 ) cout << cost[p][q];
			else cout << time[p][q];

			cout << endl;
		}
	}

	return 0;
}

C++: //zikken saitan
#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;
		}
		int k;
		cin>>k;
		int z[m][m];
		for(int i=0; i<m; i++){
			for(int j=0; j<m; j++){
				z[i][j]=C[i][j];
			}
		}

		for(int a=0;a<m; a++){
			for(int b=0; b<m; b++){
				for(int c=0; c<m; c++){
					if(z[b][c]>z[b][a]+z[a][c]){
					z[b][c]=z[b][a]+z[a][c];
					}
				}
			}
		}

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

		for(int a=0;a<m; a++){
			for(int b=0; b<m; b++){
				for(int c=0; c<m; c++){
					if(t[b][c]>t[b][a]+t[a][c]){
					t[b][c]=t[b][a]+t[a][c];
					}
				}
			}
		}

		int p,q,r;

		for(int i=0; i<k; i++){
			cin>>p>>q>>r;
			cout<<endl;
		  if(r==0){
		  	cout<<z[p-1][q-1]<<endl;
		  }else{
		  	cout<<t[p-1][q-1]<<endl;
		  }
		}
  }
	return 0;
}

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);
			co.to=a;t.to=a;
			c[0][b].push_back(co);
			c[1][b].push_back(t);
		}
		int k;
		cin>>k;
		for(int i=0;i<k;i++){
			int s,e;
			bool r;
			cin>>s>>e>>r;
			int ans=dijkstra(s,e,r);
			cout<<ans<<endl;
		}
	}
}