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;
#include<algorithm>
#include<string>
#define REP(i,a) for(int  i=0;i<a;i++)
int A[101][101];
int B[101][101];
int main(){
	int a,b=0,c=0,d,n,m;	
	cin>>n>>m;
	while(n!=0||m!=0){
	REP(i,m){
		REP(j,m){
			A[i][j]=1001;
			B[i][j]=1001;
		}
	}
	REP(i,n){
	cin>>a>>b>>c>>d;
	A[a-1][b-1]=c;
	B[a-1][b-1]=d;	
	A[b-1][a-1]=c;
	B[b-1][a-1]=d;
	}
	REP(k,m){
		REP(i,m){
		if(i==j) continue;
	 		REP(j,m){
		A[i][j]=min(A[i][j],A[i][k]+A[k][j]);
		B[i][j]=min(B[i][j],B[i][k]+B[k][j]);
		A[j][i]=A[i][j];
		B[j][i]=B[i][j];
			}
		}	
	}
	cin>>n;
	REP(i,n){
	cin>>a>>b>>c;
	if(c==0) cout<<A[a-1][b-1]<<endl;
	else cout<<B[a-1][b-1]<<endl;
	}
	cin>>n>>m;
	}
	return 0;
}

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

const int INF = 1000000000;

int main()
{
	while(true){
		int n, m;	//線路の情報の数n, 駅の数m
		cin >> n >> m;

		if(n==0 && m==0)
			break;

		int C[100][100];	//costのグラフ
		int T[100][100];	//timeのグラフ
		for(int i=0; i<m; i++){
			for(int j=0; j<m; j++){
				if(i==j){
					C[i][j] = T[i][j] = 0;		//対角線は0
				}
				else{
					C[i][j] = T[i][j] = INF;    
				}
			}
		}

		for(int i=0; i<n; i++){
			int a, b, c, t;		//線路の情報a,bとcost,time
			cin >> a >> b >> c >> t;

			C[a-1][b-1] = C[b-1][a-1] = c;
			T[a-1][b-1] = T[b-1][a-1] = t;
		}

		for(int i=0;i<m;i++){
			for(int j=0;j<m;j++){
				for(int k=0;k<m;k++){
					if(C[j][k]>C[j][i]+C[i][k])
						C[j][k] = C[j][i]+C[i][k];
					if(T[j][k]>T[j][i]+T[i][k])
						T[j][k] = T[j][i]+T[i][k];
				}
			}
		}

		int k;	//問い合わせの数
		cin >> k;
		for(int i=0;i<k;i++){
			int p, q, r;	//出発駅p, 到着駅q, 値の種類r
			cin >> p >> q >> r;
			if(r)	//r==1なら最短時間
				cout << T[p-1][q-1] << endl;
			else
				cout << C[p-1][q-1] << endl;
		}	
	}

	return 0;
}

C++: #include<iostream>
#include<cmath>
#define loop(i,a,b) for(int i=a;i<b;i++)
#define rep(i,a) loop(i,0,a)
#define INF 1e6
using namespace std;

int main(){
	int n,m,a,b,cost,time,l,p,q,r;
	while(cin>>n>>m,n||m){
		int mt[m][m],mc[m][m];
		rep(i,m)rep(j,m)mt[i][j]=mc[i][j]=INF;
		rep(i,n){
			cin>>a>>b>>cost>>time;
			mt[a-1][b-1]=mt[b-1][a-1]=time;
			mc[a-1][b-1]=mt[b-1][a-1]=cost;
		}
		rep(k,m){
			rep(i,m){
				rep(j,m){
					mt[i][j]=min(mt[i][j],mt[i][k]+mt[k][j]);
					mc[i][j]=min(mc[i][j],mc[i][k]+mc[k][j]);
				}
			}
		}
		cin>>l;
		rep(i,l){
			cin>>p>>q>>r;
			if(r==0)cout<<mc[p-1][q-1]<<endl;
			else cout<<mt[p-1][q-1]<<endl;
		}
	}
	return 0;
}