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<climits>
#include<algorithm>
using namespace std;
int main()
{
	int time[101][101],cost[101][101],n,m,i,j,k,a,b,c,d;
	while(scanf("%d%d",&n,&m),m)
	{
		for(i=0;i<101;++i)for(j=0;j<101;++j)time[i][j]=cost[i][j]=INT_MAX/2;
		for(i=0;i<n;++i)scanf("%d%d%d%d",&a,&b,&c,&d),cost[a][b]=cost[b][a]=c,time[a][b]=time[b][a]=d;
		for(k=1;k<=m;++k)for(i=1;i<=m;++i)for(j=1;j<=m;++j)
			time[i][j]=min(time[i][j],time[i][k]+time[k][j]),
			cost[i][j]=min(cost[i][j],cost[i][k]+cost[k][j]);
		scanf("%d",&k);
		for(i=0;i<k;++i)
		{
			scanf("%d%d%d",&a,&b,&c);
			printf("%d\n",c?time[a][b]:cost[a][b]);
		}
	}
	return 0;
}

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

const int INF = 1000000000;

int main()
{
  int count=0;
	while(count!=50){
		int n, m;
		cin >> n >> m;

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

		 int C[100][100];
		 int T[100][100];
	   for(int i=0; i<m; i++){
		   for(int j=0; j<m; j++){
			   if(i==j){
	         C[i][j] = T[i][j] = 0;
		     }else{
			     C[i][j] = T[i][j] = INF;
		     }
		   }
     }

	   for(int i=0; i<n; i++){
		   int a, b, c, t;
		   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;
    }

    int k;
    cin>>k;
    for(int i=0;i<k;i++){
      int p, q, r;
      int a=0;
      cin>>p>>q>>r;
      int d[m][m];
      if(r==0){
        for(int i=0;i<m;i++){
          for(int j=0;j<m;j++){
            d[i][j]=C[i][j];
          }
        }
        for(int k=0;k<m;k++){
          for(int i=0;i<m;i++){
            for(int j=0;j<m;j++){
              if(d[i][j]>d[i][k]+d[k][j]){
                d[i][j]=d[i][k]+d[k][j];
              }
            }
          }
        }
        a=d[p-1][q-1];
        cout<<a<<endl;
      }
      if(r==1){
        for(int i=0;i<m;i++){
          for(int j=0;j<m;j++){
            d[i][j]=T[i][j];
          }
        }
        for(int k=0;k<m;k++){
          for(int i=0;i<m;i++){
            for(int j=0;j<m;j++){
              if(d[i][j]>d[i][k]+d[k][j]){
                d[i][j]=d[i][k]+d[k][j];
              }
            }
          }
        }
        a=d[p-1][q-1];
        cout<<a<<endl;
      }
    }
	}

	return 0;
}

C++: #include <iostream>
#include <vector>
#define INF (int)1e9

int bellman_ford(int m, int p, int q, std::vector<std::vector<std::pair<int, int> > > v) {
    std::vector<int> rvec(m, INF);
    bool flag;
    rvec[p] = 0;
    int value;
    int target;

    do{
        flag = false;
        for (int i = 0; i < m; i++) {
            for (int j = 0; j < v[i].size(); j++) {
                value = v[i][j].first;
                target = v[i][j].second;
                if (rvec[target] > rvec[i] + value) {
                    rvec[target] = rvec[i] + value;
                    flag = true;
                }
            }
        }
    } while(flag);

    return rvec[q];
}

int main(void) {
    int n;
    int m;

    int a;
    int b;
    int cost;
    int time;

    int k;

    int p;
    int q;
    int r;

    int res;

    while (true) {
        std::cin >> n >> m;
        if (n == 0 && m == 0) {
            break; 
        }

        std::vector<std::vector<std::pair<int, int> > > vcost(m);
        std::vector<std::vector<std::pair<int, int> > > vtime(m);

        for (int i = 0; i < n; i++) {
            std::cin >> a >> b >> cost >> time;
            --a;
            --b;
            vcost[a].push_back(std::make_pair(cost, b));
            vcost[b].push_back(std::make_pair(cost, a));
            vtime[a].push_back(std::make_pair(time, b));
            vtime[b].push_back(std::make_pair(time, a));
        }

        std::cin >> k;

        for (int i = 0; i < k; i++) {
            std::cin >> p >> q >> r;
            --p;
            --q;

            // ????????????????????????
            if (r == 0) {
                res = bellman_ford(m, p, q, vcost);
            } else {
                res = bellman_ford(m, p, q, vtime);
            }
            std::cout << res << std::endl;
        }
    }
    return 0;
}

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][101][101];

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+1, INF);
            fill(dp[1][x], dp[1][x]+m+1, 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);
            dp[0][a][b] = c;
            dp[1][a][b] = t;
        }
        for(int z = 0; z <= m; z++){
            for(int x = 1; x <= m; x++){
                for(int y = 1; y <= m; y++){
                    dp[0][x][y] = min(dp[0][x][y],
                            dp[0][x][z] + dp[0][z][y]);
                    dp[1][x][y] = min(dp[1][x][y],
                            dp[1][x][z] + dp[1][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;
}