Go: // Warshall–Floyd Algorithm

package main

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

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
				} else {
					c_dist[i][j] = c_matrix[i][j]
				}
				if c_matrix[i][j] == 0{
					c_prev[i][j] = -1
				} else {
					c_prev[i][j] = i
				}
				if t_matrix[i][j] == 0{
					t_dist[i][j] = INF
				} else {
					t_dist[i][j] = t_matrix[i][j]
				}
				if t_matrix[i][j] == 0{
					t_prev[i][j] = -1
				} else {
					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<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,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);

            }
        }
    }
    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<stdio.h>
#include<algorithm>
#include <map>
#include<stdio.h>
#include<algorithm>
#include <map>
#include <list>
#include <stack>
#include <queue>
#include <map>
#include <vector>
#include <iostream>
#include <functional>
#include <time.h>
using namespace std;
clock_t fi, endtime;

const int INF = 100 * 1000 + 2;
const int r_c = 0;
const int r_t = 1;
const int MAX_V = 100;
const int MAX_E = 6000;

int n, m, a, b, c, t;
int k, p, q, r;
int wf[MAX_V][2] = { 0 };

struct edge { int from, to, ct[2]; };
edge edg[MAX_E];

int main()
{
	scanf("%d %d", &n, &m);
	for (int i = 0; i <= m * 2; ++i) {
		scanf("%d %d %d %d", &a, &b, &c, &t);
		edg[i].from = a - 1; edg[i].to = b - 1; edg[i].ct[r_c] = c; edg[i].ct[r_t] = t;
		++i;
		edg[i].from = b - 1; edg[i].to = a - 1; edg[i].ct[r_c] = c; edg[i].ct[r_t] = t;
	}
	scanf("%d", &k);
	for (int i = 0; i < k; ++i) {
		scanf("%d %d %d", &p, &q, &r);
		for (int i = 0; i < n; ++i) {
			wf[i][r] = INF;
		}
		wf[p - 1][r] = 0;
		while (1) {
			bool bo = false;
			for (int i = 0; i < m * 2; ++i) {
				edge e = edg[i];
				if (wf[e.from][r] != INF && wf[e.to][r] > wf[e.from][r] + e.ct[r]) {
					wf[e.to][r] = wf[e.from][r] + e.ct[r];
					bo = true;
				}
			}
			if (!bo) break;
		}
		if (wf[q - 1][r] == INF) printf("INF\n");
		else printf("%d\n", wf[q - 1][r]);
	}
}

C++: #include<iostream>
#include<queue>
#include<algorithm>
#include<vector>
using namespace std;
typedef pair<int,int> P;
int D[440];
int n,m,x,y,cost,Time,p,q,r;
vector<P> matrix1[440],matrix2[440];
void djkstra1(int s){ 
    priority_queue<P,vector<P>,greater<P> > que;
    for(int i=0;i<n+2;i++)D[i] = 10000000;
    D[s] = 0;
    que.push(P(s,0));

    while(!que.empty() ){
      P p = que.top();que.pop();
      int v = p.first;
      if(D[v] < p.second)continue;
      for(int i=0;i<matrix1[v].size();i++){
	P pp = matrix1[v][i];
	if(D[pp.first] > D[v] + pp.second){
	  D[pp.first] = D[v] + pp.second;
	  que.push(P(pp.first,D[pp.first]));
	}
      }
    }
}

void djkstra2(int s){ 
    priority_queue<P,vector<P>,greater<P> > que;
    for(int i=0;i<n+2;i++)D[i] = 10000000;
    D[s] = 0;
    que.push(P(s,0));

    while(!que.empty() ){
      P p = que.top();que.pop();
      int v = p.first;
      if(D[v] < p.second)continue;
      for(int i=0;i<matrix2[v].size();i++){
	P pp = matrix2[v][i];
	if(D[pp.first] > D[v] + pp.second){
	  D[pp.first] = D[v] + pp.second;
	  que.push(P(pp.first,D[pp.first]));
	}
      }
    }
}



int main(){

  while(true){
    cin >> n >> m;
    if(n+m == 0)break;
   
    for(int i=0;i<n+2;i++){
      matrix1[i].clear();
      matrix2[i].clear();
    }
    for(int i=0;i<n;i++){
      cin >> x >> y >> cost >> Time;
      matrix1[x].push_back(P(y,cost));
      matrix2[x].push_back(P(y,Time));
      matrix1[y].push_back(P(x,cost));
      matrix2[y].push_back(P(x,Time));
    }


   
   

    int k;
    cin >> k;
    for(int i=0;i<k;i++){
      cin >> p >> q >> r;
      if(r == 0){
	djkstra1(p);
	cout << D[q] << endl;
      }
      else{
	djkstra2(p);
	cout << D[q] << endl;
      }

    }

  }
  return 0;
}