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>
using namespace std;

int n, m, k;
int t[100][100], c[100][100];
int INF = 1<<21;

void solve(){
    for(int k = 0; k < m; k++){
        for(int i = 0; i < m; i++){
            for(int j = 0; j < m; j++){
                t[i][j] = min(t[i][j], t[i][k] + t[k][j]);
                c[i][j] = min(c[i][j], c[i][k] + c[k][j]);
            }
        }
    }
}

int main(){
    while(1){
        cin >> n >> m;

        if(n + m == 0)  break;
        
        for(int i = 0; i < m; i++){
            for(int j = 0; j < m; j++){
                c[i][j] = t[i][j] = INF;
            }
        }
        
        int a, b, cost, tim;
        for(int i = 0; i < n; i++){
            cin >> a >> b >> cost >> tim;
            a--; b--;
            c[a][b] = c[b][a] = cost;
            t[a][b] = t[b][a] = tim;
        }

        solve();

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

    }
    return 0;
}

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(m+1,vector<pii>(m+1,pii(INF,INF)));
	rep(i,m+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;
	}
    n=m;
    rep(k,n){
        rep(i,n){
            rep(j,n){
                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);
                v[j][i]=v[i][j];

            }
        }
    }
    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 <bits/stdc++.h>
using namespace std;

const int INF = 1e+9;
int d[128][128], t[128][128];

int main() {
	int n, m, q, a, b, cst, tie, r;
	while(cin >> n >> m && (n || m)){
		for(int i = 0; i < m; ++i){
			for(int j = 0; j < m; ++j){
				d[i][j] = INF;
				t[i][j] = INF;
			}
		}
		for(int i = 0; i < n; ++i){
			scanf("%d%d%d%d", &a, &b, &cst, &tie);
			a--; b--;
			d[a][b] = cst; d[b][a] = cst;
			t[a][b] = tie; t[b][a] = tie;
		}
		for(int k = 0; k < m; ++k){
			for(int i = 0; i < m; ++i){
				for(int j = 0; j < m; ++j){
					d[i][j] = min(d[i][j], d[i][k] + d[k][j]);
					t[i][j] = min(t[i][j], t[i][k] + t[k][j]);
				}
			}
		}
		cin >> q;
		for(int i = 0; i < q; ++i){
			scanf("%d%d%d", &a, &b, &r);
			a--; b--;
			if(r == 0){
				printf("%d\n", d[a][b]);
			}
			else{
				printf("%d\n", t[a][b]);
			}
		}
	}
	return 0;
}

C++: // 2014/06/16 Tazoe

#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;
		}
//???????????§????????£?????????
//????????????
		for(int k=0;k<m;k++){
			for(int i=0;i<7;i++){
				for(int j=0;j<m;j++){
					if(C[i][j]>C[i][k]+C[k][j]){
						C[i][j]=C[i][k]+C[k][j];
					}
				}
			}
		}
//????????????
		for(int k=0;k<m;k++){
			for(int i=0;i<7;i++){
				for(int j=0;j<m;j++){
					if(T[i][j]>T[i][k]+T[k][j]){
						T[i][j]=T[i][k]+T[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<<C[p][q]<<endl;
			if(r==1)cout<<T[p][q]<<endl;
		}
//???????????????????????????
	}

	return 0;
}

C++: #include<iostream>
#include<cstdio>

using namespace std;

int i, j, k, p, q, r, n, m, a, b, c, cost[3001], t, dc[3001][3001], dt[3001][3001];

int dic(const int d[][3001]) {
  cost[p] = 0;
  int min, f[3001] = {};
  for(i = 0; i < m; i++) {
    f[p] = 1;
    for(j = 1; j <= m; j++) {
      if(f[j]) continue;
      if(cost[j] > cost[p] + d[p][j]) cost[j]  = cost[p] + d[p][j];
    }
    min = 200000000;
    for(j = 1; j <= m; j++ ) {
      if(f[j]) continue;
      if(min > cost[j]) min = cost[p = j];
    }
  }
  return cost[q];
}


int main() {
  for(i = 0; i < 3000; i++)
    for(j = 0; j < 3000; j++) {
      dc[i][j] = 100000000;
      dt[i][j] = 100000000;
    }
  
  cin >> n >> m;
  
  while(n--) {
    cin >> a >> b >> c >> t;
    dc[a][b] = dc[b][a] = c;
    dt[a][b] = dt[b][a] = t;
  }
  
  cin >> k;
  
  while(cin >> p  >> q, p != 0 || q != 0 ) {
    cin >> r;
    for(i = 0; i <= 3000; i++) cost[i] = 100000000;
    if(r) cout << dic(dt) << endl;
    else cout << dic(dc) << endl;
  }
  
  return 0;
}