Go: // Warshall–Floyd Algorithm

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

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
					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>
using namespace std;

int main()
{
  int n,m;
  for(;cin>>n>>m,n;)
    {
      m++;
      int time[m][m];
      int money[m][m];
      for(int i=0;i<m;i++)
	for(int j=0;j<m;j++)
	  {
	    if(i==j)
	      {
		time[i][j]=0;
		money[i][j]=0;
	      }
	    else
	      {
		time[i][j]=9999999;
		money[i][j]=9999999;
	      }
	  }
      for(int i=0;i<n;i++)
	{
	int a,b;
	cin>>a>>b;
	cin>>money[a][b]>>time[a][b];
	money[b][a]=money[a][b];
	time[b][a]=time[a][b];
	}
      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]);
	      money[i][j]=min(money[i][j],money[i][k]+money[k][j]);
	    }
      int k;
      cin>>k;
      for(int i=0;i<k;i++)
	{
	  int p,q,r;
	  cin>>p>>q>>r;
	  if(r==0)
	    cout<<money[p][q]<<endl;
	  else
	    cout<<time[p][q]<<endl;
	}
    }
}

C++: #include<iostream>
#include<cstring>
using namespace std;
#define rep(i,n) for(int i=0;i<n;++i)
#define INF 30000

struct E
{
    int a,b,c,t;
    E(){};
    E(int a,int b,int c,int t):a(a),b(b),c(c),t(t){};
};
E cs[700];
unsigned int d[150];

int main()
{
    int n,m,k,p,q,r;
    while(cin >> n >> m)
    {
        if(n==0 && m==0)break;
        
        int ta,tb,tc,tt;
        for(int i=0;i<2*n;i+=2)
        {
            cin >> ta>>tb>>tc >>tt;
            cs[i] = E(ta,tb,tc,tt);
            cs[i+1] = E(tb,ta,tc,tt);
        }

        cin >> k;
        rep(i,k)
        {
            memset(d,INF,sizeof(d));
            cin >> p >> q >>r;
            d[p] = 0;

            int update = 0;
            if(r==0)while(true)
            {
                update = 0;
                rep(j,n*2)
                {
                   if(d[cs[j].a] != INF && d[cs[j].b] > d[cs[j].a] + cs[j].c)
                   {
                       update = 1;
                       d[cs[j].b] =  d[cs[j].a] + cs[j].c;
                   }
                }
                if(!update) break;
            }
            if(r==1)while(true)
            {
                update = 0;
                rep(j,n*2)
                {
                   if(d[cs[j].a] != INF && d[cs[j].b] > d[cs[j].a] + cs[j].t)
                   {
                       update = 1;
                       d[cs[j].b] =  d[cs[j].a] + cs[j].t;
                   }
                }
                if(!update) break;
            }
            cout << d[q] << endl;
        }
        
    }

    return 0;
}

C++: #define _CRT_SECURE_NO_WARNINGS

#include<fstream>
#include<iostream>
#include<string>
#include<iomanip>
#include<list>
#include<math.h>
#include<stack>
#include<queue>
#include<vector>
#include<algorithm>
#include<utility>

using namespace std;

short cost[3000][3000];
short time_data[3000][3000];


int main(){
	short n, m;


	while (cin >> n >> m && (n != 0 && m != 0)) {
		short min_ = 2000; // 答えの最小値
		short min_num = 1; // 答えの町

		short from, to, time_, cost_;
		short k;
		short k_from, k_to, info;

		for (short i = 0; i < 3000; i++) {
			for (short j = 0; j < 3000; j++) {
				cost[i][j] = 2000;
				time_data[i][j] = 2000;
			}
		}
		for (short i = 0; i < 3000; i++) {
			cost[i][i] = 0;
		}
		for (short i = 0; i < n; i++) {
			cin >> from >> to >> cost_ >> time_;
			cost[from][to] = cost_;
			cost[to][from] = cost_;
			time_data[from][to] = time_;
			time_data[to][from] = time_;
		}
		for (short k = 1; k <= m; k++) {
			for (short i = 1; i <= m; i++) {
				for (short j = 1; j <= m; j++) {
					cost[i][j] = min((int)cost[i][j], cost[i][k] + cost[k][j]);

					time_data[i][j] = min((int)time_data[i][j], time_data[i][k] + time_data[k][j]);
				}
			}
		}
		// 答えを求める
		cin >> k;
		for (short i = 0; i < k; i++) {
			cin >> k_from >> k_to >> info;
			if (info == 0) {
				cout << cost[k_from][k_to] << endl;
			} else {
				cout << time_data[k_from][k_to] << endl;
			}
		}
		
  }
	return 0;
}

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


int d[1000][1000][2];
int main(){
    int n, m;
    while (cin >> n >> m && n | m){
        for (int i = 0; i < n; i++){
            for (int j = 0; j < n; j++){
                d[i][j][0] = d[i][j][1] = 1 << 29;
                if (i == j)d[i][j][0] = d[i][j][1] = 0;
            }
        }
        for (int i = 0; i < n; i++){
            int a, b, c, dd;
            cin >> a >> b >> c >> dd;
            a--, b--;
            d[a][b][0] = d[b][a][0] = c;
            d[a][b][1] = d[b][a][1] = dd;
        }
        for (int k = 0; k < n; k++){
            for (int i = 0; i < n; i++){
                for (int j = 0; j < n; j++){
                    d[i][j][0] = min(d[i][j][0], d[i][k][0] + d[k][j][0]);
                    d[i][j][1] = min(d[i][j][1], d[i][k][1] + d[k][j][1]);
                }
            }
        }
        int q; cin >> q;
        while (q--){
            int x, y; cin >> x >> y;
            x--, y--;
            int a; cin >> a;
            cout << d[x][y][a] << endl;
        }
    }
}