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<stdio.h>

int dijkstra(int, int, int, int, int**);

int main(void)
{
	int f1, f2, n, m, a, b, ic, ti, k, p, q, r, out, **cost, **time;

	while(scanf("%d %d",&n,&m) && n > 0)
	{

		cost = new int *[m];
		time = new int *[m];
		//線路設計
		for(f1 = 0; f1 < n; f1++)
		{
			cost[f1] = new int [m];
			time[f1] = new int [m];
			for(f2 = 0; f2 < m; f2++)
			{
				cost[f1][f2] = 0;
				time[f1][f2] = 0;
			}
		}
		//線路情報入力
		for(f1 = 0; f1 < n; f1++)
		{
			scanf("%d %d %d %d",&a, &b, &ic, &ti);
			a--;
			b--;
			cost[a][b] = ic;
			cost[b][a] = ic;
			time[a][b] = ti;
			time[b][a] = ti;
		}
		//問い合わせ入力
		scanf("%d",&k);
		for(f1 = 1; f1 <= k; f1++)
		{
			scanf("%d %d %d",&p, &q, &r);
			p--;
			q--;
			if(r == 0)
				out = dijkstra(n, m, p, q, cost);
			else
				out = dijkstra(n, m, p, q, time);

			printf("%d\n",out);
		}
	}
	return 0;
}

int dijkstra(int n, int m, int p, int q, int **temp)
{
	int *C, *sum, f1, po = p, min;
	//Cの中身　0：出発していない　1：出発した
	C = new int [m];
	sum = new int [m];
	//初期化
	for(f1 = 0; f1 < m; f1++)
	{
		C[f1] = 0;
		sum[f1] = 0;
	}
	//ダイクストラ探索
	while(po != q)
	{
		//現在いる地点から次の駅までにかかるコストを計算し次に行く駅の現時点での最小コストを求める
		for(f1 = 0; f1 < m; f1++)
		{
			if(temp[po][f1] > 0)
			{
				if(C[f1] == 0 && (sum[f1] == 0 || temp[po][f1] + sum[po] < sum[f1]))
					sum[f1] = temp[po][f1] + sum[po];
			}
		}
		//出発していない駅の中で最小コストを選択する
		min = 0;
		C[po] = 1;
		for(f1 = 0; f1 < m; f1++)
		{
			if(C[f1] == 0 && sum[f1] != 0 && (min == 0 || sum[f1] < min))
			{
				min = sum[f1];
				po = f1;
			}
		}
	}
	return sum[q];
}

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

int main(){
	vector< vector<short> > cost, time;
	vector<int> station;
	int n, m;
	while( cin >> n >> m, n||m ){
		cost.resize(m+1);
		time.resize(m+1);
		station.resize(m+1);
		for( int i=1; i<=m; i++ ){
			cost[i].resize(m+1);
			time[i].resize(m+1);
			for( int j=1; j<=m; j++ ){
				cost[i][j] = time[i][j] = -1;
			}
		}
		station.resize(m);
		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;
		}
		int k;
		cin >> k;
		for( int i=0; i<k; i++ ){
			int p, q, r;
			cin >> p >> q >> r;
			for( int j=1; j<=m; j++ ){
				station[j] = -1;
			}
			station[p] = 0;
			for( int z=0; z<m; z++ ){
				int ny=-1, nextVal=1000000;
				for( int x=1; x<=m; x++ ){
					if( station[x] != -1 ){
						for( int y=1; y<=m; y++ ){
							if( (station[y]==-1) && (cost[x][y] != -1) ){
								int val = station[x];
								if( r==0 )	// cost
									val += cost[x][y];
								else if( r==1 )	// time
									val += time[x][y];
								if( val < nextVal ){
									nextVal = val;
									ny = y;
								}
							}
						}
					}
				}
				station[ny] = nextVal;
				if( ny == q )	break;
			}
			cout << station[q] << endl;
		}
	}	
	return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <vector>
#include <utility>
#include <queue>
#include <functional>
#define N 101
#define INF 2000000000
using namespace std;
 
int dist[N];
typedef pair<int,int> pii;
 
std::vector<pii> e1[N];
std::vector<pii> e2[N];
 
int dijk1(int a,int b){
    dist[a]=0;
    std::priority_queue<pii> pq;
    for(int i=0;i<e2[a].size();i++){
        pq.push(e2[a][i]);
    }
    while(!pq.empty()){
        pii temp=pq.top();
        int now=temp.second;
        int c=temp.first;
        pq.pop();
        if(dist[now]!=INF)continue;
        dist[now]=c;
        if(now==b)break;
        for(int i=0;i<e2[now].size();i++){
                if(dist[e2[now][i].second]==INF) pq.push(make_pair(c+e2[now][i].first,e2[now][i].second));
        }
    }
    return -dist[b];
}
 
int dijk(int a,int b){
    dist[a]=0;
    std::priority_queue<pii> pq;
    for(int i=0;i<e1[a].size();i++){
        pq.push(e1[a][i]);
    }
    while(!pq.empty()){
        pii temp=pq.top();
        int now=temp.second;
        int c=temp.first;
        pq.pop();
        if(dist[now]!=INF)continue;
        dist[now]=c;
        if(now==b)break;
        for(int i=0;i<e1[now].size();i++){
            if(dist[e1[now][i].second]==INF) pq.push(make_pair(c+e1[now][i].first,e1[now][i].second));
        }
    }
    return -dist[b];
}
 
int main(void){
    int a,b,c,d;
    int n,m;
    while(cin>>n>>m,n||m){
        for(int i=0;i<n;i++){
            cin>>a>>b>>c>>d;
            e1[a].push_back(make_pair(-c,b));
            e2[a].push_back(make_pair(-d,b));
e1[b].push_back(make_pair(-c,a));
            e2[b].push_back(make_pair(-d,a));
        }
        int k;
        cin>>k;
        while(k--){
            for(int i=1;i<=m;i++)dist[i]=INF;
            cin>>a>>b>>c;
            if(c) cout<<dijk1(a,b)<<endl;
            else cout<<dijk(a,b)<<endl;
            // for(int i=1;i<=m;i++)printf("dist[%d]:%d\n",i,dist[i]);
        }
    }
    return 0;
}