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<cstring>
#include<algorithm>
using namespace std;
int x[1000][1000][2], n, m, a, b, c, d, q;

int path(int n, int s, int g) {
	int p[1000];
	memset(p, 127, sizeof(p));
	p[s] - 0;
	for (int i = 0; i < n; i++){
		for (int j = 1; j <= n; j++) {
			for (int k = 1; k <= n; k++) {
				if (x[j][k][1] < 10000000) {
					p[k] = min(p[k], p[j] + x[j][k][1]);
				}
			}
		}
	}
	return p[g];
}

int score(int n, int s, int g) {
	int p[1000];
	memset(p, 127, sizeof(p));
	p[s] - 0;
	for (int i = 0; i < n; i++) {
		for (int j = 1; j <= n; j++) {
			for (int k = 1; k <= n; k++) {
				if (x[j][k][0] < 10000000) {
					p[k] = min(p[k], p[j] + x[j][k][0]);
				}
			}
		}
	}
	return p[g];
}

int main() {
	while (true) {
		memset(x, 0, sizeof(x));
		cin >> m >> n;
		if (m == 0 && n == 0) { break; }
		for (int i = 0; i < m; i++) {
			cin >> a >> b >> c >> d;
			x[a][b][0] = c;
			x[b][a][0] = c;
			x[a][b][1] = d;
			x[b][a][1] = d;
		}
		cin >> q;
		for (int i = 0; i < q; i++) {
			cin >> a >> b >> c;
			if (c == 0) { cout << score(n, a, b); }
			else { cout << path(n, a, b); }
		}
	}
}

C++: #include<iostream>
#include<algorithm>
const int INF = 1<<20;
const int N = 101;
int cost[N][N];
int tim[N][N];
using namespace std;
int main()
{
	int n, m, a, b, co, ti,r;
	while (1){
		cin >> n >> m;
		if (n == 0 && m == 0)return 0;
		for (int i = 0; i < N; i++){
			for (int i2 = 0; i2 < N; i2++){
				cost[i][i2] = INF;
				tim[i][i2] = INF;
			}
		}
		for (int i = 0; i < n; i++){
			cin >> a >> b >> co >> ti;
			cost[a][b] = co;
			cost[b][a] = co;
			tim[a][b] = ti;
			tim[b][a] = ti;
		}
		for (int k = 0; k < m+1; ++k)
			for (int i = 0; i < m+1; ++i)
				for (int j = 0; j < m+1; ++j)
				{
					cost[i][j] = min(cost[i][j], cost[i][k] + cost[k][j]);
					tim[i][j] = min(tim[i][j], tim[i][k] + tim[k][j]);
				}
		cin >> m;
		for (int i = 0; i < m; i++){
			cin >> a >> b >> r;
			if (r == 0){
				cout << cost[a][b] << endl;
			}
			else
				cout << tim[a][b] << endl;
		}
	}
}

C++: /* Warshall-Floyd Algorithm */

#include<iostream>
#include<algorithm>

using namespace std;

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

	for(int n,m;cin>>n>>m,n;){
		for(int i=1;i<=m;i++)
			for(int j=1;j<=m;j++)
				cost[i][j]=time[i][j]=1<<29;

		for(int i=0;i<n;i++){
			int a,b,c,t;	cin>>a>>b>>c>>t;
			cost[a][b]=cost[b][a]=c;
			time[a][b]=time[b][a]=t;
		}

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

		int k;	cin>>k;
		while(k--){
			int p,q,r;	cin>>p>>q>>r;
			cout<<(r?time[p][q]:cost[p][q])<<endl;
		}
	}

	return 0;
}

C++: #include<iostream>
#include<algorithm>
using namespace std;
int main(){
  int n,m;
  while(cin >>n>>m,n||m){
    int c_t[100][100][2],ans[100][100][2];
    for(int i=0; i<100; i++){
      for(int j=0; j<100; j++){
	for(int k=0; k<2; k++){
	  ans[i][j][k] = 100000000;
	}
      }
    }
    for(int i=0,a,b,c,d; i<n; i++){
      cin >>a>>b>>c>>d;
      a--;b--;
      ans[a][b][0] = ans[b][a][0] = c;
      ans[a][b][1] = ans[a][b][1] = d;
    }
    for(int k=0; k<2; k++){
      for(int i=0; i<m; i++){
	for(int j=0; j<m; j++){
	  for(int l=0; l<m; l++){
	    ans[i][j][k] = min(ans[i][j][k],ans[i][l][k]+ans[l][j][k]);
	  }
	}
      }
    }
    int t=0;
    cin >>t;
    while(t--){
      int p,q,r;
      cin >>p>>q>>r;
      cout <<ans[p-1][q-1][r]<<endl;
    }
  }
  return 0;
}

C++: #include <iostream>
using namespace std;

#define INF int(100100)

int main(){
    while(1){
        int n,m;
        cin >> n >> m;
        
        if(n==0&&m==0)  break;          //終了の判断

        int time[m][m],cost[m][m];

        for(int i=0;i<m;i++){           //配列の初期化
            for(int j=0;j<m;j++){
                if(i==j)
                    time[i][j] = cost[i][j] = 0;
                else
                    time[i][j] = cost[i][j] = INF;
            }
        }

        for(int i=0;i<n;i++){           //配列の設定
            int a,b,c,t;
            cin >> a >> b >> c >> t;
            time[a-1][b-1] = time[b-1][a-1] = t;
            cost[a-1][b-1] = cost[b-1][a-1] = c;
        }

        for(int k=0;k<m;k++){           //最短距離に書き換え
            for(int i=0;i<m;i++){
                for(int j=0;j<m;j++){
                    if(time[i][j]>(time[i][k]+time[k][j]))
                        time[i][j] = time[i][k]+time[k][j];
                    if(cost[i][j]>(cost[i][k]+cost[k][j]))
                        cost[i][j] = cost[i][k]+cost[k][j];
                }
            }
        }

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

            if(r==1){
                cout << time[p-1][q-1] << endl;
            }else{
                cout << cost[p-1][q-1] << endl;
            }
        }
    }

    return 0;
}