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;

#define rep(i, n) for(int i = 0;i < (int)n;i++)

int c[100][100];
int t[100][100];

int main() {
    while(true) {
        int n, m;
        cin >> n >> m;
        if(!n && !m) break;

        rep(i, m) {
            rep(j, m) {
                c[i][j] = t[i][j] = (i != j ? 1001 : 0);
            }
        }

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

        rep(i, m) {
            rep(j, m) {
                rep(k, m) {
                    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]);
                }
            }
        }

        int k;
        cin >> k;
        rep(i, k) {
            int p, q, r;
            cin >> p >> q >> r;
            p--; q--;
            cout << (r == 0 ? c[p][q] : t[p][q]) << endl;
        }
    }

    return 0;
}

C++: #include<iostream>
#include<algorithm>
#include<climits>
using namespace std;
const int INF = INT_MAX/3;
const int MAXN = 200;
const int TIME = 1,COST = 0;
int graph[2][MAXN][MAXN];
int n,m,a,b,c,t,k;//m:wÌAn:GbWÌ
void solve();
void init(){
  for(int i = 0;i < m;i++)
    for(int j = 0;j < m;j++)
      graph[0][i][j] =graph[0][j][i] = graph[1][j][i] = graph[1][i][j] = INF;
}
int main(){
  cin >> n >> m;
  init();
  for(int i = 0;i < n;i++){
    cin >> a >> b >> c >>t;
    graph[TIME][a-1][b-1] = graph[TIME][b-1][a-1] = t;
    graph[COST][a-1][b-1] = graph[TIME][b-1][a-1] = c;
  }

  solve();

  cin >> k;
  for(int i = 0;i < k;i++){
    cin >> a >> b >>c;
    cout << graph[c][a-1][b-1] << endl;
  }
  cout.flush();
  return 0;
}

void solve(){
  for(int k = 0;k < m;k++){
    for(int i = 0;i < m;i++){
      for(int j = 0;j < m;j++){
	graph[0][i][j] = min(graph[0][i][j],graph[0][i][k] + graph[0][k][j]);
	graph[1][i][j] = min(graph[1][i][j],graph[1][i][k] + graph[1][k][j]);
      }
    }
  }
}

C++: #include <algorithm>
#include <cctype>
#include <climits>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <string>
#include <vector>

using namespace std;

#define reps(i,f,n) for(int i=f; i<int(n); ++i)
#define rep(i,n) reps(i,0,n)

typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> pii;

const int INF = 1001001001;

int main()
{
	int n, m;
	while(scanf("%d%d", &n, &m), n){
		vvi C(m, vi(m, INF));
		vvi T = C;
		rep(i, n){
			int a, b, c, t;
			scanf("%d%d%d%d", &a, &b, &c, &t);
			--a;
			--b;
			C[a][b] = C[b][a] = c;
			T[a][b] = T[b][a] = t;
		}
		
		rep(k, m) rep(i, m) rep(j, m){
			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]);
		}
		
		int k;
		scanf("%d", &k);
		rep(i, k){
			int a, b, r;
			scanf("%d%d%d", &a, &b, &r);
			--a;
			--b;
			printf("%d\n", r==0 ? C[a][b] : T[a][b]);
		}
	}
	return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <algorithm>
using namespace std;
int main(void){

	int n, m, a, b, cost1, time1, k, p, q, r;
	int d_cost[101][101], d_time[101][101];

	while (cin >> n >> m && n != 0 && m != 0){

		for (int i = 1; i < m + 1; i++){
			for (int j = 1; j < m + 1; j++){

				d_cost[i][j] = 1001;
				d_time[i][j] = 1001;
			}
		}

		for (int i = 0; i < n; i++){

			cin >> a >> b >> cost1 >> time1;
			d_cost[a][b] = cost1;
			d_cost[b][a] = cost1;
			d_time[a][b] = time1;
			d_time[b][a] = time1;
		}

		/*cout << endl;
		for (int i = 1; i < m; i++){
			for (int j = 1; j < m; j++){

				printf("%5d", d_cost[i][j]);
			}
			cout << endl;
		}
		cout << endl;
		for (int i = 1; i < m; i++){
			for (int j = 1; j < m; j++){

				printf("%5d", d_time[i][j]);
			}
			cout << endl;
		}*/

		for (int i = 1; i < m + 1; i++){
			for (int j = 1; j < m + 1; j++){
				for (int k = 1; k < m + 1; k++){

					d_cost[j][k] = min(d_cost[j][k], d_cost[j][i] + d_cost[i][k]);
					d_time[j][k] = min(d_time[j][k], d_time[j][i] + d_time[i][k]);
				}
			}
		}

		cin >> k;

		for (int i = 0; i < k; i++){

			cin >> p >> q >> r;

			if (r == 0)
				cout << d_cost[p][q] << endl;
			else
				cout << d_time[p][q] << endl;
		}
	}
}

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

using namespace std;

int main() {
	int a, b, time, cost, querys;
	int i, j, k, p, q, r, n, m;
	int times[100][100], costs[100][100];

	while (true) {
		cin >> n >> m;
		if (!n && !m)
			break;

		for (i = 0; i < m; i++) {
			for (j = 0; j < m; j++) {
				times[i][j] = (i == j) ? 0 : 1e9;
				times[j][i] = (i == j) ? 0 : 1e9;
			}
		}

		for (i = 0; i < n; i++) {
			cin >> a >> b >> cost >> time;
			times[a - 1][b - 1] = time;
			times[b - 1][a - 1] = time;
			costs[a - 1][b - 1] = cost;
			costs[b - 1][a - 1] = cost;
		}

		for (k = 0; k < m; k++) {
			for (i = 0; i < m; i++) {
				for (j = 0; j < m; j++) {
					times[i][j] = min(times[i][j], times[i][k] + times[k][j]);
					costs[i][j] = min(costs[i][j], costs[i][k] + costs[k][j]);
				}
			}
		}

		cin >> querys;
		for (i = 0; i < querys; i++) {
			cin >> p >> q >> r;
			cout << (r ? times[p - 1][q - 1] : costs[p - 1][q - 1]) << endl;
		}
	}
}