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 <fstream>
#include <typeinfo>
#include <vector>
#include <cmath>
#include <set>
#include <string>
#include <algorithm>
#include <cstdio>
#include <queue>
#include <iomanip>
#include <cctype>
#define syosu(x) fixed<<setprecision(x)
using namespace std;
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
typedef pair<double,double> pdd;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<char> vc;
typedef vector<vc> vvc;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef pair<int,P> pip;
typedef vector<pip> vip;
const int inf=1<<30;
const double pi=acos(-1);
const double eps=1e-8;
const vi emp;

class Graph{
	private:
	int GV;
	vvp List;
	public:
	Graph(int v){
		GV=v;
		List=vvp(v);
	}
	void add_edge(int x,int y,int c){
		List[x].push_back(P(y,c));
		List[y].push_back(P(x,c));
	}
	int DIJ(int s,int t){
		priority_queue<P> que;
		vi d(GV,inf);
		d[s]=0;
		que.push(P(0,s));
		while(!que.empty()){
			P p=que.top();
			que.pop();
			int v=p.second;
			if(d[v]<p.first) continue;
			for(int i=0;i<List[v].size();i++){
				P e=List[v][i];
				if(d[e.first]>d[v]+e.second){
					d[e.first]=d[v]+e.second;
					que.push(P(d[e.first],e.first));
				}
			}
		}
		return d[t];
	}
};

int V,E,N;

int main(){
	while(1){
		cin>>E>>V;
		if(!V&&!E) break;
		Graph cost(V),time(V);
		int s,t,c,l;
		for(int i=0;i<E;i++){
			cin>>s>>t>>c>>l;
			s--;
			t--;
			cost.add_edge(s,t,c);
			time.add_edge(s,t,l);
		}
		cin>>N;
		bool r;
		for(int i=0;i<N;i++){
			cin>>s>>t>>r;
			s--;
			t--;
			if(r) cout<<time.DIJ(s,t)<<endl;
			else cout<<cost.DIJ(s,t)<<endl;
		}
	}
}

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

	return 0;
}

C++: #include <iostream>
#include <algorithm>
using namespace std;
const int INF=(1<<21);
int main(){
  int road1[111][111];
  int road2[111][111];
  int n,m;
  int a,b,cost,time;
  int p,q,r;
  int x;
  while(1){
    for(int i=0;i<111;i++){
      for(int j=0;j<111;j++){
	road1[i][j]=road2[i][j]=INF;
      }
    }
    cin >> n >> m;
    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;
      cout << (r==0 ? road1[p-1][q-1] : road2[p-1][q-1]) << endl;
    }
  }
}

C++: 6 5
1 2 200 10
1 4 400 15
1 3 250 25
2 4 100 10
4 5 150 20
3 5 300 20
2
1 5 0
1 5 1

C++: #include <list>
#include <queue>
#include <vector>
#include <iostream>
#include <algorithm>
#include <functional>
#define INF (1LL << 60)
using namespace std;
bool used[100]; long long dist[100];
void dijkstra(int V, int E, int s, vector<pair<int, long long> > X[]) {
	priority_queue<pair<long long, int>, vector<pair<long long, int> >, greater<pair<long long, int> > > Q;
	for (int i = 0; i < V; i++) dist[i] = INF, used[i] = false;
	dist[s] = 0; Q.push(make_pair(0, s));
	int cnt = 0;
	while (!Q.empty()) {
		if (cnt > E) return; // NEGATIVE_CYCLE
		pair<long long, int> p = Q.top(); used[p.second] = true; Q.pop();
		for (int i = 0; i < X[p.second].size(); i++) {
			int to = X[p.second][i].first; long long leng = X[p.second][i].second;
			if (dist[to] > dist[p.second] + leng && !used[to]) {
				dist[to] = dist[p.second] + leng;
				Q.push(make_pair(dist[to], to));
			}
		}
	}
}
int n, m, q, a, b, c, u, v, w1, w2; vector<pair<int, long long> > G1[100], G2[100];
int main() {
	while(cin >> n >> m, n) {
		for(int i = 0; i < m; i++) G1[i].clear(), G2[i].clear();
		for(int i = 0; i < n; i++) {
			cin >> u >> v >> w1 >> w2;
			G1[u].push_back(make_pair(v, w1));
			G1[v].push_back(make_pair(u, w1));
			G2[u].push_back(make_pair(v, w2));
			G2[v].push_back(make_pair(u, w2));
		}
		cin >> q;
		for(int i = 0; i < q; i++) {
			cin >> a >> b >> c;
			if(c == 0) {
				dijkstra(m, n, a, G1);
				cout << dist[b] << endl;
			}
			else {
				dijkstra(m, n, a, G2);
				cout << dist[b] << endl;
			}
		}
	}
}