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 <iostream>
#include <vector>
#include <string>
#include <sstream>
#include <algorithm>
#include <map>
#include <set>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <stack>
#include <queue>
#include <utility>
#define rep(i,l,n) for(lint i=l;i<n;i++)
#define rer(i,l,n) for(lint i=l;i<=n;i++)
#define all(a) a.begin(),a.end()
#define o(a) cout<<a<<endl
using namespace std;
typedef long long lint;
typedef vector<int> vi;
typedef vector<lint> vli;
typedef vector<vi> vvi;
typedef pair<int,int> pii;

int c[101][101];
int t[101][101];//d[u][v]??????e=(u,v)????????????(?????¨???????????´??????INF,??????d[i][i]=0??¨??????)
int V;//????????°
const int INF=10000000;

void warshall_floyd(){
	for(int k=0;k<V;k++){
		for(int i=0;i<V;i++){
			for(int j=0;j<V;j++){
				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 main(){
	while(1){
		int n,m;
		cin>>n>>m;
		V=m;
		if(n+m==0) break;
		rep(i,0,V){
			rep(j,0,V){
				if(i==j){
					c[i][j]=0;
					t[i][j]=0;
				}else{
					c[i][j]=INF;
					t[i][j]=INF;
				}
			}
		}
		int a,b,cost,time;
		rep(i,0,n){
			cin>>a>>b>>cost>>time;
			a--; b--;
			c[a][b]=cost;
			c[b][a]=cost;
			t[a][b]=time;
			t[b][a]=time;
		}
		warshall_floyd();
		int kazu,p,q,r;
		cin>>kazu;
		rep(i,0,kazu){
			cin>>p>>q>>r;
			p--; q--;
			o((r==0?c[p][q]:t[p][q]));
		}
	}
}

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

using namespace std;

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)
#define INF 11451400


/*
int main(){
	while(true){
		int lineL, statL;
		cin >> lineL >> statL;
		if(lineL==0&&statL==0){return 0;}

		long leastCosts[statL][statL];
		long leastTimes[statL][statL];
		FOR(aStat,0,statL){
			FOR(bStat,0,statL){
				leastCosts[aStat][bStat] = leastTimes[aStat][bStat] = (aStat==bStat)?0:INF;
			}
		}

		REP(lineI,lineL){
			int naStat,nbStat,nCost,nTime;
			cin >> naStat >> nbStat >> nCost >> nTime;
			naStat -=1; nbStat -=1;
			FOR(aStat,0,statL){
				FOR(bStat,0,statL){
					leastCosts[aStat][bStat] = min(leastCosts[aStat][bStat] , leastCosts[aStat][naStat]+nCost+leastCosts[nbStat][bStat]);
					leastCosts[aStat][bStat] = min(leastCosts[aStat][bStat] , leastCosts[aStat][nbStat]+nCost+leastCosts[naStat][bStat]);
					leastTimes[aStat][bStat] = min(leastTimes[aStat][bStat] , leastTimes[aStat][naStat]+nTime+leastTimes[nbStat][bStat]);
					leastTimes[aStat][bStat] = min(leastTimes[aStat][bStat] , leastTimes[aStat][nbStat]+nTime+leastTimes[naStat][bStat]);
				}
			}
		}

		int reqL;
		cin >> reqL;
		REP(reqI,reqL){
			int aStat,bStat,costOrTime;
			cin >> aStat >> bStat >> costOrTime;
			aStat-=1;bStat-=1;
			if(costOrTime==0){cout<<leastCosts[aStat][bStat]<<endl;};
			if(costOrTime==1){cout<<leastTimes[aStat][bStat]<<endl;};
		}
	}
}
*/

int main(){
	while(true){
		int lineL, statL;
		cin >> lineL >> statL;
		if(lineL==0&&statL==0){return 0;}

		long leastCosts[statL][statL];
		long leastTimes[statL][statL];
		FOR(aStat,0,statL){
			FOR(bStat,0,statL){
				leastCosts[aStat][bStat] = leastTimes[aStat][bStat] = (aStat==bStat)?0:INF;
			}
		}

		REP(lineI,lineL){
			int naStat,nbStat,nCost,nTime;
			cin >> naStat >> nbStat >> nCost >> nTime;
			naStat -=1; nbStat -=1;
			leastCosts[naStat][nbStat] = nCost;
			leastTimes[naStat][nbStat] = nTime;
		}

		REP(k,statL) REP(i,statL) REP(j,statL) {
			leastCosts[i][j] = min(leastCosts[i][j] , leastCosts[i][k]+leastCosts[k][j]);
			leastTimes[i][j] = min(leastTimes[i][j] , leastTimes[i][k]+leastTimes[k][j]);
		}

		int reqL;
		cin >> reqL;
		REP(reqI,reqL){
			int aStat,bStat,costOrTime;
			cin >> aStat >> bStat >> costOrTime;
			aStat-=1;bStat-=1;
			if(costOrTime==0){cout<<leastCosts[aStat][bStat]<<endl;};
			if(costOrTime==1){cout<<leastTimes[aStat][bStat]<<endl;};
		}
	}
}

C++: #include <stdio.h>
#define INF 100000000

int main(void){
	int n,m;
	
	while(scanf("%d%d",&m,&n),n,m){
		int i,j;
		int a,b,cost,time,c;
		int DPc[256][256];
		int DPt[267][256];
		int k,ans[128],count=0;
		
		for(i=0;i<128;i++){
			for(j=0;j<128;j++){
				if(i==j){
					DPc[i][j]=0;
					DPt[i][j]=0;
				}
				else{
					DPc[i][j]=INF;
					DPt[i][j]=INF;
				}
			}
		}
		
		for(i=0;i<m;i++){
			scanf("%d%d%d%d",&a,&b,&cost,&time);
			DPc[a][b]=cost;
			DPc[b][a]=cost;
			DPt[a][b]=time;
			DPt[b][a]=time;
		}
		for(i=0;i<=n;i++){
			for(j=0;j<=n;j++){
				for(k=0;k<=n;k++){
					if(DPt[i][k]+DPt[k][j]<DPt[i][j]){
						DPt[i][j]=DPt[i][k]+DPt[k][j];
					}
					if(DPc[i][k]+DPc[k][j]<DPc[i][j]){
						DPc[i][j]=DPc[i][k]+DPc[k][j];
					}
				}
			}
		}
		
		scanf("%d", &m);
		for(i=0;i<m;i++){
			scanf("%d%d%d",&a,&b,&c);
			if(c==1){
				ans[count]=DPt[a][b];
			}
			else {
				ans[count]=DPc[a][b];
			}
			count++;
		}
		for(i=0;i<m;i++){
			printf("%d\n",ans[i]);
		}
	}
	return 0;
}