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 <iostream>

#define N 101
#define INF 1e+9

using namespace std;
int main(void){
	int n,m;
	while(cin>>n>>m,n||m){
		int cost[N][N],times[N][N];
		for(int i=1;i<=m;++i)for(int j=1;j<=m;++j){cost[i][j]=times[i][j]=INF;}
		for(int i=0,a,b,c,t;i<n;++i){
			cin>>a>>b>>c>>t;
			cost[a][b]=cost[b][a]=c;
			times[a][b]=times[b][a]=t;
		}
		int k;cin>>k;
		for(int i=0,p,q,r;i<k;++i){
			cin>>p>>q>>r;
			if(r){//time
				int d[N];
				for(int j=1;j<=m;++j) d[j]=INF;
				d[p]=0;
				bool f=false;
				for(;;){
					for(int j=1;j<=m;++j){//from
						for(int k=1;k<=m;++k){//to
							if(d[j]!=INF && d[j] + times[j][k] < d[k]){
								f=true;
								d[k] = d[j] + times[j][k];
							}
						}
					}
					if(f==false) break;
					f=false;
				}
				cout<<d[q]<<endl;
			}else{//cost
				int d[N];
				for(int j=1;j<=m;++j) d[j]=INF;
				d[p]=0;
				bool f=false;
				for(;;){
					for(int j=1;j<=m;++j){//from
						for(int k=1;k<=m;++k){//to
							if(d[j]!=INF && d[j] + cost[j][k] < d[k]){
								f=true;
								d[k] = d[j] + cost[j][k];
							}
						}
					}
					if(f==false) break;
					f=false;
				}
				cout<<d[q]<<endl;
			}
		}
	}
	return 0;
}

C++: #include<iostream>
#include<cstdio>
#include<queue>
using namespace std;
#define MAX 10000000
#define MAX_ST 101 //MAX_STATION
#define LP(i,n) for(int i=0;i<n;i++)
class Node{
public:
	int at;
	int cost;
	Node(int a,int c){
		at=a;cost=c;
	}
	bool operator < (const Node &o) const{
		return cost>o.cost;
	}
};
int feeMap[MAX_ST][MAX_ST];
int timeMap[MAX_ST][MAX_ST];
int minMap[MAX_ST];
bool visited[MAX_ST];
typedef priority_queue<Node> PQ;

int dijkstra(int st,int ed,int n,int judge){
	PQ pq;
	pq.push(Node(st,0));
	while(!pq.empty()){
		Node cur=pq.top();pq.pop();
		if(cur.at==ed)return cur.cost;
//		cout<<"now:"<<cur.at<<endl;
		for(int i=1;i<=n;i++){
			if((judge&&timeMap[cur.at][i]==MAX)||(!judge&&feeMap[cur.at][i]==MAX)||cur.at==i)continue;
			int cost=judge?timeMap[cur.at][i]:feeMap[cur.at][i];
			if(minMap[i]<cur.cost+cost)continue;
			//cout<<"    next:"<<i<<endl;
			minMap[i]=cur.cost+cost;
			pq.push(Node(i,cur.cost+cost));
		}
	}
	cout<<"not found"<<endl;
	return MAX;
}

void init(){
	LP(i,MAX_ST){LP(j,MAX_ST)feeMap[i][j]=timeMap[i][j]=MAX;visited[i]=false;minMap[i]=MAX;}
}
void printMap(int n){
	LP(i,n){LP(j,n)printf("%8d",feeMap[i][j]!=MAX?feeMap[i][j]:-1);cout<<endl;}
	cout<<"---------------------------------------------------------"<<endl;
	LP(i,n){LP(j,n)printf("%8d",timeMap[i][j]!=MAX?timeMap[i][j]:-1);cout<<endl;}
}
int main(){
	int n,m;
	while(cin>>n>>m&&(n||m)){
		init();
		int _n=n;
		//ツ静シツ路ツ湘ョツ陛ア
		for(int a,b,cost,time;n--&&cin>>a>>b>>cost>>time;){
			if(feeMap[a][b]>cost)feeMap[a][b]=feeMap[b][a]=cost;
			if(timeMap[a][b]>time)timeMap[a][b]=timeMap[b][a]=time;
		}
		//printMap(_n);
		int d;
		cin>>d;
		//ツ姪「ツつ「ツ債づュツつケ
		for(int p,q,r;d--&&cin>>p>>q>>r;){
			cout<<dijkstra(p,q,_n,r)<<endl;
		}
	}
	return 0;
}

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

short cost[101][101];
short gtime[101][101];

struct tSta{
	int val;
	short sta, psta;
	tSta( int s ){
		val = 0;
		sta = s;
		psta = 0;
	}
};

bool operator<( const tSta& l, const tSta& r ){
	return l.val > r.val;
}

int main(){
	priority_queue<tSta> que;
	int n, m, k;
	while( cin >> n >> m, n||m ){
		memset( cost, 0, sizeof(cost) );
		memset( gtime, 0, sizeof(gtime) );
		for( int i=0; i<n; i++ ){
			int a, b, c, t;
			cin >> a >> b >> c >> t;
			cost[a][b] = cost[b][a] = c;
			gtime[a][b] = gtime[b][a] = t;
		}
		cin >> k;
		for( int i=0; i<k; i++ ){
			int p, q, r;
			cin >> p >> q >> r;
			while( !que.empty() )	que.pop();
			que.push( tSta(p) );
			while( !que.empty() ){
				tSta ts = que.top();
				if( ts.sta == q )	break;
				que.pop();
				if( r==0 ){	// cost
					for( int j=1; j<=m; j++ ){
						if( cost[ts.sta][j] > 0 && ts.psta != j ){
							tSta next(j);
							next.val = ts.val + cost[ts.sta][j];
							next.psta = ts.sta;
							que.push( next );
						}
					}
				}else if( r==1 ){	// time
					for( int j=1; j<=m; j++ ){
						if( gtime[ts.sta][j] > 0 && ts.psta != j ){
							tSta next(j);
							next.sta = j;
							next.val = ts.val + gtime[ts.sta][j];
							next.psta = ts.sta;
							que.push( next );
						}
					}
				}
			}
			cout << que.top().val << endl;
		}
	}
	return 0;
}