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 <cstdio>
using namespace std;

#define rep(i,a) for(int i = 0 ; i < a ; i ++)
#define loop(i,a,b) for(int i = a ; i < b ; i ++)

int N,M;
int maze[100][100],tim[100][100];
int main(void){
	while(cin>>N>>M,N+M){
	rep(i,M)rep(j,M)maze[i][j] = (1<<20),tim[i][j] = (1<<20);
	while(N--){
		int a,b,c,t;
		cin>>a>>b>>c>>t;
		maze[--a][--b] = c;
		tim[a][b] = t;
	}
	cout<<endl;
	rep(k,M){
		rep(i,M){
			rep(j,M){
				if(maze[i][j] > maze[i][k] + maze[k][j]){
					// update
					maze[i][j] = maze[i][k] + maze[k][j];
					tim[i][j] = min(tim[i][j],tim[i][k] + tim[k][j]);
				} 
			}
		}
	}
	rep(i,M)rep(j,M)cout<<tim[i][j]<<(j==M-1?'\n':' ');
	cin>>N;
	while(N--){
		int a,b,t;
		cin>>a>>b>>t;
		cout<<(t?tim[--a][--b]:maze[--a][--b])<<endl;
	}
}
}

C++: #include<iostream>
#include<string>
#include<cstdio>
#include<algorithm>
#include<stack>
#include<queue>
#include<vector>
#include<cmath>
#include<utility>
#include<set>
#include<complex>
#include<map>
#define vi vector<int>
#define vvi vector<vector<int> >
#define ll long long int
#define vl vector<ll>
#define vvl vector<vector<ll>>
#define vb vector<bool>
#define vc vector<char>
#define vs vector<string>
#define ld long double
#define INF 1e9
#define EPS 0.0000000001
#define rep(i,n) for(int i=0;i<n;i++)
#define loop(i,s,n) for(int i=s;i<s;i++)
#define CC puts("-------ok--------");
#define all(in) in.begin(), in.end()
using namespace std;
typedef pair<int,int> pii;
#define MAX 99999999
signed main(){
while(1){
	int n,m;
	cin>>n>>m;
    if(!(n+m))break;
	vector<vector<pii>>v(n+1,vector<pii>(n+1,pii(INF,INF)));
	rep(i,n+1)v[i][i]=pii(0,0?\);
	rep(i,n){
		pii temp;
		int s,g;
		cin>>s>>g>>temp.first>>temp.second;
        v[--s][--g]=temp;
	}
    rep(k,m){
        rep(i,m){
            rep(j,m){
                v[i][j].first=min(v[i][k].first+v[k][j].first,v[i][j].first);
                v[i][j].second=min(v[i][k].second+v[k][j].second,v[i][j].second);

            }
        }
    }
    int k; cin>>k;
    rep(i,k){
        int s,g,r; cin>>s>>g>>r;
        if(!r)cout<<v[--s][--g].first<<endl;
        else cout<<v[--s][--g].second<<endl;
    }
    
    }
}

C++: #include <iostream>
#include <algorithm>
using namespace std;
const int MAX=100;
const int INF=(1<<21);
int main(){
  int road1[MAX][MAX];
  int road2[MAX][MAX];
  int n,m;
  int a,b,cost,time;
  int p,q,r;
  int x;
  while(1){
    cin >> n >> m;
    for(int i=0;i<n;i++){
      for(int j=0;j<m;j++){
	road1[i][j]=INF;
	road2[i][j]=INF;
      }
    }
    if(n==0 && m==0)break;
    for(int i=0;i<n;i++){
      cin >> a >> b >> cost >> time;
      road1[a-1][b-1]=road1[b-1][a-1]=cost;
      road2[a-1][b-1]=road2[b-1][a-1]=time;
    }

    for(int k=0;k<n;k++){
      for(int i=0;i<n;i++){
	for(int j=0;j<n;j++){
	  road1[i][j]=min(road1[i][j],road1[i][k]+road1[k][j]);
	  road2[i][j]=min(road2[i][j],road2[i][k]+road2[k][j]);
	}
      }
    }
    
    cin >> x;
    for(int i=0;i<x;i++){
      cin >> p >> q >> r;
      if(r==0){
	cout << road1[p-1][q-1] << endl;
      }
      else{
	cout << road2[p-1][q-1] << endl;
      }
    }
  }
}

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

const int INF = 1000000000;

int main(){
	while(true){
		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 cd[m][m];
    int td[m][m];

    for(int i=0; i<m; i++){
      for(int j=0; j<m; j++){
        cd[i][j] = C[i][j];
      }
    }
    for(int i=0; i<m; i++){
      for(int j=0; j<m; j++){
        td[i][j] = T[i][j];
      }
    }

    for(int h=0; h<m; h++){
      for(int i=0; i<m; i++){
        for(int j=0; j<m; j++){
          if(cd[i][j] > cd[i][h]+cd[h][j]){
            cd[i][j] = cd[i][h]+cd[h][j];
          }
        }
      }
    }

    for(int h=0; h<m; h++){
      for(int i=0; i<m; i++){
        for(int j=0; j<m; j++){
          if(td[i][j] > td[i][h]+td[h][j]){
            td[i][j] = td[i][h]+td[h][j];
          }
        }
      }
    }

    int k;
    cin >> k;

    while(k>0){
      int p,q,r;
      cin >> p >> q >> r;

      if(r==0){
        cout << cd[p-1][q-1] << '\n';
      }else if(r==1){
        cout << td[p-1][q-1] << '\n';
      }

      k--;
    }

	}

	return 0;
}