Go: // Warshall–Floyd Algorithm

package main

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

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
					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<queue>
#include<vector>
#include<map>
using namespace std;
typedef pair<int,int> P;
typedef struct{
	int next;
	int cost;
	int tim;
}edge;

int n,m;
vector<edge> mapp[111];
int bfs_c(int now,int goal);
int bfs_t(int now,int goal);

int main(){
	while(1){
		cin >> n >> m;
		if(n == 0 && m == 0) break;
		for(int i=0;i<n+1;i++){
			mapp[i].clear();
		}
		for(int i=0;i<n;i++){
			int a,b,cost,tim;
			cin >> a >> b >> cost >> tim;
			edge x;
			x.next = b; x.cost = cost; x.tim = tim;
			mapp[a].push_back(x);
		}
		int k;
		cin >> k;
		int ans;
		for(int i=0;i<k;i++){
			int p,q,r;
			cin >> p >> q >> r;
			if(r == 0) ans = bfs_c(p,q);
			else if(r == 1) ans = bfs_t(p,q);
			cout << ans << endl;
		}
	}
}

int bfs_c(int now,int goal){
	priority_queue<P, vector<P>,greater<P> > que;
	que.push(P(now,0));
	while(!que.empty()){
		P p = que.top(); que.pop();
		int no = p.first;
		int co = p.second;
		if(no == goal) return co;
		int len=mapp[no].size();
		for(int i=0;i<len;i++){
			edge x = mapp[no][i];
			que.push(P(x.next,co+x.cost));
		}
	}
	return 0;
}

int bfs_t(int now,int goal){
	priority_queue<P, vector<P>,greater<P> > que;
	que.push(P(now,0));
	while(!que.empty()){
		P p = que.top(); que.pop();
		int no = p.first;
		int co = p.second;
		if(no == goal) return co;
		int len=mapp[no].size();
		for(int i=0;i<len;i++){
			edge x = mapp[no][i];
			que.push(P(x.next,co+x.tim));
		}
	}
	return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;

typedef long long int ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pair<int, int> > vii;
#define rrep(i, m, n) for(int (i)=(m); (i)<(n);  (i)++)
#define  rep(i, n)    for(int (i)=0; (i)<(n);  (i)++)
#define  rev(i, n)    for(int (i)=(n)-1; (i)>=0; (i)--)
#define vrep(i, c)    for(__typeof((c).begin())i=(c).begin(); i!=(c).end(); i++)
#define  ALL(v)       (v).begin(), (v).end()
#define mp            make_pair
#define pb            push_back
template<class T1, class T2> inline void minup(T1& m, T2 x){ if(m>x) m=static_cast<T2>(x); }
template<class T1, class T2> inline void maxup(T1& m, T2 x){ if(m<x) m=static_cast<T2>(x); }

#define INF 1000000000LL
#define MOD 1000000009
#define EPS 1E-9

const int MAX_V = 1000;
ll dp[2][MAX_V][MAX_V];
int E, V;
int a, b;
ll c, t;
int k;
int p, q, r;

int main()
{
  //  while((cin >> E >> V) && E && V){
  while(scanf(" %d %d", &E, &V) && E && V){
    rep(i, 101) rep(j, 101) dp[0][i][j] = dp[1][i][j] = INF;

    rep(i, E){
      //      cin >> a >> b >> c >> t;
      scanf(" %d %d %d %d", &a, &b, &c, &t);
      a-=1;  b-=1;
      dp[0][a][b] = dp[0][b][a] = c;
      dp[1][a][b] = dp[1][b][a] = t;
    }

    rep(b, 2) rep(k, V) rep(i, V) rep(j, V) minup(dp[b][i][j], dp[b][i][k] + dp[b][k][j]);

    //    cin >> k;
    scanf(" %d", &k);
    while(k--){
      //      cin >> p >> q >> r;
      scanf(" %d %d %d", &p, &q, &r);
      //      cout << dp[r][p-1][q-1] << endl;
      printf("%lld\n", dp[r][p-1][q-1]);
    }
  }

  return 0;
}

C++: #include<iostream>
#include<queue>
#include<algorithm>

using namespace std;

#define inf 1000000000

int n,m;
int C[101][101];
int T[101][101];

class S{
	public:
	int iti,now;
	S(){}
	S(int a,int b){iti=a;now=b;}
	bool operator < (const S &a)const{
		return now>a.now;
	}
};
int dike(int st,int en,int va){
	priority_queue<S> state;
	int sima[101];
	for(int i=0;i<101;i++){
		sima[i]=inf;
	}
	state.push(S(st,0));
	sima[st]=0;
	while(1){
		S u;
		u=state.top();
		state.pop();
		
		if(u.iti==en){
			return u.now;
		}
		
		for(int i=1;i<=m;i++){
			if(C[u.iti][i]==inf){
				continue;
			}
			if(u.now+C[u.iti][i] < sima[i]){
				int cost=C[u.iti][i];
				if(va==1){
					cost=T[u.iti][i];
				}
				sima[i]=sima[u.iti]+cost;
				state.push(S(i,sima[i]));
			}
		}
	}
}

int main(){
	while(1){
		cin>>n>>m;
		if(n==0)break;
		for(int i=0;i<101;i++){
			for(int j=0;j<101;j++){
				C[i][j]=inf;
				T[i][j]=inf;
			}
		}
		for(int i=0;i<n;i++){
			int a,b,c,d;
			cin>>a>>b>>c>>d;
			C[a][b]=C[b][a]=c;
			T[a][b]=T[b][a]=d;
		}
		
		int l;
		cin>>l;
		for(int i=0;i<l;i++){
			int a,b,c;
			cin>>a>>b>>c;
			printf("%d\n",dike(a,b,c));
		}
	}
}

C++: //ワーシャルフロイド
#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
#define INF 1000001

int mincost[100];
struct Edge{
	int from,to;
	int cost;
	Edge(int a,int b,int c):from(a),to(b),cost(c){}
};

int main(){
	int n,m,p,q,r,k;
	int a,b,c,d;
	vector<Edge> cost[2];
	while(cin>>n>>m,n|m){
		cost[0].clear();
		cost[1].clear();
		for(int i=0;i<n;i++){
			cin>>a>>b>>c>>d;
			a--;b--;
			cost[0].push_back(Edge(a,b,c));
			cost[0].push_back(Edge(b,a,c));
			cost[1].push_back(Edge(a,b,d));
			cost[1].push_back(Edge(b,a,d));
		}
		cin>>k;
		while(k--){
			bool updata;
			fill_n((int*)mincost,sizeof(mincost)/sizeof(int),INF);
			cin>>p>>q>>r;
			p--;q--;
			mincost[p]=0;
			do{
				updata=false;
				for(int i=0;i<2*n;i++){
					Edge &e=cost[r][i];
					if(mincost[e.from]+e.cost < mincost[e.to]){
						mincost[e.to] = mincost[e.from]+e.cost;
						updata=true;
					}
				}
			}while(updata);
			cout<<mincost[q]<<endl;
		}
	}
}