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 <algorithm>

# define INF 1e6
# define MAX_V 100

int e, v, K;

int d[2][MAX_V][MAX_V];

int main(){
	while (1){
		for (int i = 0; i < v; ++i){
			for (int j = 0; j < v; ++j){
				d[0][i][j] = (i == j) ? 0 : INF;
				d[1][i][j] = (i == j) ? 0 : INF;
			}
		}
		int a, b, cost, time;
		std::cin >> e >> v;
		if ((e + v) == 0)
			break;
		for (int i = 0; i < e; ++i){
			std::cin >> a >> b >> cost >> time;
			d[0][a][b] = cost;
			d[0][b][a] = cost;
			d[1][a][b] = time;
			d[1][b][a] = time;
		}
		for (int k = 0; k < v; ++k){
			for (int i = 0; i < v; ++i){
				for (int j = 0; j < v; ++j){
					d[0][i][j] = std::min(d[0][i][j], d[0][i][k] + d[0][k][j]);
					d[1][i][j] = std::min(d[1][i][j], d[1][i][k] + d[1][k][j]);
				}
			}
		}
		int p, q, r;
		std::cin >> K;
		for (int i = 0; i < K; ++i){
			std::cin >> p >> q >> r;
			std::cout << d[r][p - 1][q - 1] << std::endl;
		}
	}
	return 0;
}

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

const int MAX=1001;
const int INF=(1<<21);

int main(){

  int n,m;
  int a,b,cost,time;
  int p,q,r;
  int rail_cost[MAX][MAX];
  int rail_time[MAX][MAX];
  int k;
  while(1){
    cin>> n>> m;
    if(n==0 && m==0) break;
  
  for(int i=0;i<m;i++){
    for(int j=0;j<m;j++){
      rail_cost[i][j]=INF;
      rail_time[i][j]=INF;
    }
  }

  for(int i=0;i<n;i++){
    cin>> a>> b>> cost>> time; 
    rail_cost[a-1][b-1]=cost;
    rail_time[a-1][b-1]=time;
  }

  for(int i=0;i<m;i++){
    for(int j=0;j<m;j++){
      for(int k=0;k<m;k++){
	rail_cost[j][k]=min(rail_cost[j][k],rail_cost[j][i]+rail_cost[i][k]);
	rail_time[j][k]=min(rail_time[j][k],rail_time[j][i]+rail_time[i][k]);
      }
    }
  }

  cin>> k;
  for(int i=0;i<k;i++){
    cin>> p>> q>> r;
    if(r==0){
      cout<< rail_cost[p-1][q-1]<< endl;
    }else{
      cout<< rail_time[p-1][q-1]<< endl;
    }
  }

  }
}

C++: #include<cstdio>
#include<cstring>
#include<algorithm>
#include<functional>
#define M 2100000
using namespace std;
int main(void)
{
	int i,j,n,k,m,a[1001],b[1001],cost[1001],time[1001],kk,pp,bre;
	int p[201],q[201],r[201];
	int kin[101][101],zi[101][101];
	int flg[10001],leng[10001],min;
	int kaku,skin,szi;
	scanf("%d %d",&n,&m);
	for(i=1;i<=n;i++) scanf("%d %d %d %d",&a[i],&b[i],&cost[i],&time[i]);
	
	
	/**/
	//??£??\????????????  ??????
	for(i=1;i<=m;i++) {
		for(j=1;j<=m;j++) {
			kin[i][j]=M;
		}
	}
	for(i=1;i<=m;i++) kin[i][i]=0;
	for(i=1;i<=n;i++) {
		kin[a[i]][b[i]]=cost[i];
	}
	//??£??\???????????????
	for(i=1;i<=m;i++) {
		for(j=1;j<=m;j++) {
			zi[i][j]=M;
		}
	}
	for(i=1;i<=m;i++) zi[i][i]=0;
	for(i=1;i<=n;i++) {
		zi[a[i]][b[i]]=time[i];
	}
	/**/
	bre=0;
	scanf("%d",&k);
	while(1){
		for(i=1;i<=k;i++) {
			scanf("%d %d ",&p[i],&q[i]);
			if(p[i]==0 && q[i]==0) {
				break;
				bre=1;
			}
			scanf("%d",&r[i]);
		}
		if(bre==1) break;
		for(i=1;i<=k;i++) {
			for(j=1;j<=m;j++) {
				leng[j]=M;
				flg[j]=0;
			}
			pp=p[i];
			leng[pp]=0;
			
			if(r[i]==0) {
				for(j=1;j<=m;j++) {
					min=M;
					for(kk=1;kk<=m;kk++) {
						if(flg[kk]==0 && leng[kk]<min) {
							kaku=kk;
							min=leng[kk];
						}
					}
					
					flg[kaku]=1;
					
					for(kk=1;kk<=m;kk++) {
						if((leng[kaku]+kin[kaku][kk])<leng[kk]) leng[kk]=leng[kaku]+kin[kaku][kk];
					}
				}
				printf("%d\n",leng[q[i]]);
			}
			else {
				for(j=1;j<=m;j++) {
					min=M;
					for(kk=1;kk<=m;kk++) {
						if(flg[kk]==0 && leng[kk]<min) {
							kaku=kk;
							min=leng[kk];
						}
					}
					flg[kaku]=1;
					for(kk=1;kk<=m;kk++) {
						if((leng[kaku]+zi[kaku][kk])<leng[kk]) leng[kk]=leng[kaku]+zi[kaku][kk];
					}
				}
				printf("%d\n",leng[q[i]]);
			}
		}

	/*	//cost
		printf("??????\n");
		printf("      ");
		for(i=1;i<=m;i++) printf("%7d ",i);
		printf("\n");
		printf("\n");
		for(i=1;i<=m;i++) {
			printf("%7d  ",i);
			for(j=1;j<=m;j++) {
				printf("%7d ",kin[i][j]);
			}
			printf("\n");
		}
		printf("\n");
		printf("\n");
		//time
		printf("??????\n");
		printf("      ");
		for(i=1;i<=m;i++) printf("%7d ",i);
		printf("\n");
		printf("\n");
		for(i=1;i<=m;i++) {
			printf("%7d  ",i);
			for(j=1;j<=m;j++) {
				printf("%7d ",zi[i][j]);
			}
			printf("\n");
		}
		printf("\n");*/
		return 0;
	}
}