Go: // Warshall–Floyd Algorithm

package main

import (
	"bufio"
	"os"
	"strings"
	"strconv"
	"fmt"
)

var scanner = bufio.NewScanner(os.Stdin)

const INF = 0x7FFFFFFF

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
				} else {
					c_dist[i][j] = c_matrix[i][j]
				}
				if c_matrix[i][j] == 0{
					c_prev[i][j] = -1
				} else {
					c_prev[i][j] = i
				}
				if t_matrix[i][j] == 0{
					t_dist[i][j] = INF
				} else {
					t_dist[i][j] = t_matrix[i][j]
				}
				if t_matrix[i][j] == 0{
					t_prev[i][j] = -1
				} else {
					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]
					t_newlen := t_dist[i][k] + t_dist[k][j]
					if c_newlen < c_dist[i][j] {
						c_dist[i][j] = c_newlen
						c_prev[i][j] = c_prev[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 <string>
#define MAX 1001
using namespace std;

int main(){
  int i,j,k,kk,aa,bb,n,m,a,b,d,dd,c[101][101],t[101][101],f;
  while(1){
    cin >> n >> m;
    if(n == 0 && m == 0) break;

    for(i=1;i<=m;i++){
      for(j=1;j<=m;j++){
	if(i == j){
	  c[i][j] = 0;
	  t[i][j] = 0;
	}
	else{
	  c[i][j] = MAX;
	  t[i][j] = MAX;
	}
      }
    }

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

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

    cin >> kk;
    for(i=0;i<kk;i++){
      cin >> aa >> bb >> f;
      if(f) cout << t[aa][bb] << endl;
      else cout << c[aa][bb] << endl;
    }

  }
  return 0;
}

C++: #include <bits/stdc++.h>
#define r(i,n) for(int i=0;i<n;i++)
#define INF 1<<29
using namespace std;
main(){
  int m,n;
  while(cin>>m>>n,n){
    int a1[n][n],a2[n][n],q,w,e,r;
    r(i,n)r(j,n){
      if(i==j)a2[i][j]=a1[i][j]=0;
      else a2[i][j]=a1[i][j]=INF;
    }
    while(m--){
      scanf("%d%d%d%d",&q,&w,&e,&r);q--;w--;
      a1[q][w]=a1[w][q]=e;
      a2[q][w]=a2[w][q]=r;
    }
    r(k,n)r(i,n)r(j,n){
      a1[i][j]=min(a1[i][j],a1[i][k]+a1[k][j]);
      a2[i][j]=min(a2[i][j],a2[i][k]+a2[k][j]);
    }
    cin>>e;
    while(e--){
      scanf("%d%d%d",&q,&w,&r);q--;w--;
      if(r)cout<<a2[q][w]<<endl;
      else cout<<a1[q][w]<<endl;
    }
  }
}

C++: #include<iostream>
#include<queue>
#include<vector>
#include<limits>

using namespace std;

struct RequestObj {
	int begin, end, type;
};

int n, m;//???,???????????°
int k;//????????¨????????°
int time_table[100][100];
int cheap_table[100][100];
RequestObj request[200];


const int INF = 100000000;

int main() {
	while (cin >> n >> m, n * m) {

		for (int i = 0; i < m; i++)for (int j = 0; j < m; j++)time_table[i][j] = INF, cheap_table[i][j] = INF;
		
		for (int i = 0; i < n; i++) {
			int a, b;
			cin >> a >> b;
			cin >> cheap_table[a - 1][b - 1] >> time_table[a - 1][b - 1];
		}
		cin >> k;
		for (int i = 0; i < k; i++) {
			cin >> request[i].begin >> request[i].end >> request[i].type;
		}
		for (int i = 0; i < m; i++) {
			for (int j = 0; j < m; j++) {
				for (int k = 0; k < m; k++) {
					if (cheap_table[j][i] + cheap_table[i][k] < cheap_table[j][k]) {
						cheap_table[j][k] = cheap_table[j][i] + cheap_table[i][k];
					}
				}
			}
		}

		for (int i = 0; i < m; i++) {
			for (int j = 0; j < m; j++) {
				for (int k = 0; k < m; k++) {
					if (time_table[j][i] + time_table[i][k] < time_table[j][k]) {
						time_table[j][k] = time_table[j][i] + time_table[i][k];
					}
				}
			}
		}
		for (int i = 0; i < k; i++) {
			if (request[i].type == 0) {
				cout << cheap_table[request[i].begin - 1][request[i].end - 1] << endl;
			}
			else {
				cout << time_table[request[i].begin - 1][request[i].end - 1] << endl;
			}
		}

		for (int i = 0; i < m; i++)for (int j = 0; j < m; j++)time_table[i][j] = INF, cheap_table[i][j] = INF;

	}
	return 0;
}

C++: #include <algorithm>
#include <map>
#include <vector>
#include <iostream>
#include <sstream>
#include <cstdio>
#include <cstring>
#include <cctype>
#include <cstdlib>
#include <cmath>
#include <string>
#include <queue>
#include <stack>
#include <set>
using namespace std;

#define REP(i,n) for(int i=0; i<n; ++i)
#define IREP(it,array) for(vector<int>::iterator it=array.begin(); it!=array.end(); ++it)
#define SREP(it,array) for(vector<string>::iterator it=array.begin(); it!=array.end(); ++it)

#define MP       make_pair
#define PB       push_back
#define ALL(x)   (x).begin(),(x).end()

const int INF = 1<<29;
const double EPS = 1e-9;
double zero(double d){
  return d < EPS ? 0.0 : d;
}

typedef long long LL;
typedef pair<int,int> P;


int main()
{
  cout.setf(ios::fixed, ios::floatfield);
  cout.precision(7);

  int n,m;
  while(cin >> n >> m){
    if(n==0&&m==0)
      return 0;

    vector< vector<int> > cost(m+1, vector<int>(m+1,INF)),
      time(m+1, vector<int>(m+1,INF));

    REP(i,cost.size()){
      cost[i][i] = time[i][i] = 0;
    }

    REP(i,n){
      int a,b,c,t;
      cin >> a >> b >> c >> t;
      cost[a][b] = cost[b][a] = c;
      time[a][b] = time[b][a] = t;
    }

    REP(i,cost.size()){
      REP(j,cost.size()){
	REP(k,cost.size()){
	  cost[j][k] = min( cost[j][k], cost[j][i] + cost[i][k] );
	  time[j][k] = min( time[j][k], time[j][i] + time[i][k] );
	}
      }
    }

    int k;
    cin >> k;
    REP(_tmp,k){
      int p,q,r;
      cin >> p >> q >> r;
      int res= r ? time[p][q] : cost[p][q];
      cout << res << endl;
    }
  }

  return 0;
}