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 <cstdio>
#include <algorithm>
#include <vector>
#include <utility>
using namespace std;

const int INF = 1<<29;

int n, m, a, b, c, t, k;
int dp[2][100][100];

int main(){
    for(; scanf("%d%d", &n, &m), n||m;){
        for(int x = 0; x < m; x++){
            fill(dp[0][x], dp[0][x]+m, INF);
            fill(dp[1][x], dp[1][x]+m, INF);
        }
        for(int x = 0; x < m; x++){
            dp[0][x][x] = dp[1][x][x] = 0;
        }
        for(int x = 0; x < n; x++){
            scanf("%d%d%d%d", &a, &b, &c, &t);
            --a; --b;
            dp[0][a][b] = c;
            dp[0][b][a] = c;
            dp[1][a][b] = t;
            dp[1][b][a] = t;
        }
        for(int z = 0; z < m; z++){
            for(int x = 0; x < m; x++){
                for(int y = 0; y < m; y++){
                    for(int w = 0; w < 2; w++){
                        dp[w][x][y] = min(dp[w][x][y],
                                dp[w][x][z] + dp[w][z][y]);
                    }
                }
            }
        }
        scanf("%d", &k);
        for(int x = 0; x < k; x++){
            scanf("%d%d%d", &a, &b, &c);
            printf("%d\n", dp[c][--a][--b]);
        }
    }
    return 0;
}

C++: #include <cstdio>
#include <iostream>
#include <string>
#define INF (1<<21)
using namespace std;

int main(){
  int i,j,k,n,m,a,b,d,dd,c[300][300],t[300][300];
  while(1){
    cin >> n >> m;
    if(n == 0 && m == 0) break;

    for(i=0;i<=n;i++){
      for(j=0;j<=n;j++){
	c[i][j] = INF;
	t[i][j] = INF;
	if(i == j){
	  c[i][j] = 0;
	  t[i][j] = 0;
	}
      }
    }

    for(i=0;i<n;i++){
      cin >> a >> b >> d >> dd;
      c[a][b] = c[b][a] = d;
      t[a][b] = t[b][a] = dd;
    }

    for(i=0;i<=m;i++){
      for(j=0;j<=m;j++){
	for(k=0;k<=m;k++){
	  if(t[i][j] > t[i][k] + t[k][j]) t[i][j] = t[i][k] + t[k][j];
	  if(c[i][j] > c[i][k] + c[k][j]) c[i][j] = c[i][k] + c[k][j];
	}
      }
    }

    cin >> k;
    for(i=0;i<k;i++){
      cin >> a >> b >> d;
      if(d) cout << t[a][b] << endl;
      else cout << c[a][b] << endl;
    }

  }
  return 0;
}

C++: #include<iostream>
#include<string.h>
using namespace std;
int kingaku(void);
int saitan(void);
#define WHITE 0
#define GLAY 1
#define BLACK 2
#define INF 9999
int n;	//	??????????????±?????°
int m;	//	?§??????°
int p;	//	????????°
int q;	//	??°?????°
int minv;
int cost[101][101];
int Time[101][101];
int dd[101];
int main()
{
	int a,b,c,t,k,r;
	while(1){
		memset(cost,INF,sizeof(cost));
		memset(Time,INF,sizeof(Time));
		cin >> n >> m;
		if(n == 0 && m == 0) break;
		for(int i=0;i<n;i++){
			cin >> a >> b >> c >>t;
			cost[a][b] = cost[b][a] = c;
			Time[a][b] = Time[b][a] = t;
		}
		cin >> k;
		for(int i=0;i<k;i++){
			cin >> p >> q >> r;
			if(r == 0)
				cout << kingaku() << endl;
			else if(r == 1)
				cout << saitan() << endl;
			//for(int i=1;i<=m;i++)
			//	cout << i << " " << dd[i] << endl;
		}
	}
	return 0;
}

int kingaku()
{
	int u;
	int color[101];
	memset(dd,INF,sizeof(dd));
	memset(color,WHITE,sizeof(color));
	dd[p] = 0;
	color[p] = GLAY;
	while(1){
		u = -1;
		minv = INF;
		for(int i=1;i<=m;i++){
			if(minv > dd[i] && color[i] != BLACK){
				minv = dd[i];
				u = i;
			}
		}
		if(u==-1) break;
		color[u] = BLACK;
		for(int i=1;i<=m;i++){
			if(cost[u][i] != INF && color[i] != BLACK){
				if(dd[i] > dd[u] + cost[u][i])	//
					     //1?§?     1?§???¨??\?????????????§?
					dd[i] = dd[u] + cost[u][i];
			}
		}
	}
	return dd[q];
}

int saitan()
{
	int u;
	int color[101];
	memset(dd,INF,sizeof(dd));
	memset(color,WHITE,sizeof(color));
	dd[p] = 0;
	color[p] = GLAY;
	while(1){
		u = -1;
		minv = INF;
		for(int i=1;i<=m;i++){
			if(minv > dd[i] && color[i] != BLACK){
				minv = dd[i];
				u = i;
			}
		}
		if(u==-1) break;
		color[u] = BLACK;
		for(int i=1;i<=m;i++){
			if(Time[u][i] != INF && color[i] != BLACK){
				if(dd[i] > dd[u] + Time[u][i])
					dd[i] = dd[u] + Time[u][i];
			}
		}
	}
	return dd[q];
}

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

int n, m;
int k;
int cost[100][100];
int time[100][100];

int main()
{
	memset(cost, 0x0f, sizeof cost);
	memset(time, 0x0f, sizeof time);

	cin >> n >> m;
	for (int i = 0; i < n; ++i)
	{
		int a, b, cost_, time_;
		cin >> a >> b >> cost_ >> time_;

		cost[a - 1][b - 1] = cost_;
		cost[b - 1][a - 1] = cost_;

		time[a - 1][b - 1] = time_;
		time[b - 1][a - 1] = time_;
	}

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

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