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<vector>
using namespace std;

struct Node{
  int num;

  vector<int> edge_to;
  vector<int> edge_cost;
  vector<int> edge_time;

  bool done;
  int cost;
  int time;
};

int main(){
  for(;;){
    int n,m,a,b,c,t,p,q,r;
    cin>>n>>m;
    if(n==0&&m==0)break;
    vector<Node> node;

    for(int i=1;i<=m;i++){
      Node no;
      no.num=i;
      no.done=false;
      no.cost=-1;
      no.time=-1;
      node.push_back(no);
    }


    while(n--){
      cin>>a>>b>>c>>t;
      node[a-1].edge_to.push_back(b);
      node[b-1].edge_to.push_back(a);
      node[a-1].edge_cost.push_back(c);
      node[b-1].edge_cost.push_back(c);
      node[a-1].edge_time.push_back(t);
      node[b-1].edge_time.push_back(t);
    }

    cin>>n;
    while(n--){
      cin>>p>>q>>r;
      vector<Node> n(node.size());
      copy(node.begin(),node.end(),n.begin());
      p--;
      q--;
      if(r){

	n[p].time = 0;
	while(1){

	  Node doneNode;
	  int d=-1;
	  doneNode.time = -1;

	  for(int i=0;i<n.size();++i){
	    if( n[i].done || n[i].time < 0) {
	    } else if(doneNode.time==-1 || n[i].time < doneNode.time) {
	      doneNode = n[i];
	      d=i;
	    }
	  }

	  if ( doneNode.time == -1 ) {
	    break;
	  }

	  n[d].done = true;

	  for(int i=0;i<doneNode.edge_to.size();++i) {
	    int ttime= doneNode.time + doneNode.edge_time[i];
	    if(n[doneNode.edge_to[i]-1].time < 0 || ttime < n[doneNode.edge_to[i]-1].time){
	      n[doneNode.edge_to[i]-1].time = ttime;
	    }
	  }

	}
	cout<<n[q].time<<endl;

      }else{

	n[p].cost = 0;

	while(1){

	  Node doneNode;
	  int d=-1;
	  doneNode.cost = -1;

	  for(int i=0;i<n.size();++i){
	    if( n[i].done || n[i].cost < 0) {
	    } else if(doneNode.cost==-1 || n[i].cost < doneNode.cost) {
	      doneNode = n[i];
	      d=i;
	    }
	  }

	  if ( doneNode.cost == -1 ) {
	    break;
	  }

	  n[d].done = 1;

	  for(int i=0;i<doneNode.edge_to.size();++i) {
	    int tcost= doneNode.cost + doneNode.edge_cost[i];
	    if(n[doneNode.edge_to[i]-1].cost < 0 || tcost < n[doneNode.edge_to[i]-1].cost){
	      n[doneNode.edge_to[i]-1].cost = tcost;
	    }
	  }

	}
	cout<<n[q].cost<<endl;
      }

    }
  }
}

C++: #include<iostream>
#include<algorithm>
const int INF = 1<<20;
const int N = 101;
int cost[N][N];
int tim[N][N];
using namespace std;
int main()
{
	cout << INF << endl;
	int n, m, a, b, co, ti,r;
	while (1){
		cin >> n >> m;
		if (n == 0 && m == 0)return 0;
		for (int i = 0; i < N; i++){
			for (int i2 = 0; i2 < N; i2++){
				cost[i][i2] = INF;
				tim[i][i2] = INF;
			}
		}
		for (int i = 0; i < n; i++){
			cin >> a >> b >> co >> ti;
			cost[a][b] = co;
			cost[b][a] = co;
			tim[a][b] = ti;
			tim[b][a] = ti;
		}
		for (int k = 0; k < N; ++k)
			for (int i = 0; i < N; ++i)
				for (int j = 0; j < N; ++j)
				{
					cost[i][j] = min(cost[i][j], cost[i][k] + cost[k][j]);
					tim[i][j] = min(tim[i][j], tim[i][k] + tim[k][j]);
				}
		cin >> m;
		for (int i = 0; i < m; i++){
			cin >> a >> b >> r;
			if (r == 0){
				cout << cost[a][b] << endl;
			}
			else
				cout << tim[a][b] << endl;
		}
	}
}

C++: #include <iostream>
#include <climits>
#include <vector>

using namespace std;

typedef vector< int > VI;
typedef vector< VI > VVI;
typedef vector< VVI > VVVI;

const int INF = INT_MAX / 2;

int main()
{
	cin.tie( 0 );
	ios::sync_with_stdio( false );

	while ( true )
	{
		int n, m;
		cin >> n >> m;

		if ( !( n | m ) )
		{
			break;
		}

		VVVI G( m, VVI( m, VI( 2, INF ) ) );

		for ( int i = 0; i < m; i++ )
		{
			G[i][i][0] = G[i][i][1] = 0;
		}

		// 入力処理とグラフの構築
		for ( int i = 0; i < n; i++ )
		{
			int a, b, cost, time;
			cin >> a >> b >> cost >> time;

			a--;
			b--;

			G[a][b][0] = G[b][a][0] = cost;
			G[a][b][1] = G[b][a][1] = time;
		}

		// Warshall-Froyd
		for ( int k = 0; k < m; k++ )
		{
			for ( int i = 0; i < m; i++ )
			{
				for ( int j = 0; j < m; j++ )
				{
					G[i][j][0] = min( G[i][j][0], G[i][k][0] + G[k][j][0] );
					G[i][j][1] = min( G[i][j][1], G[i][k][1] + G[k][j][1] );
				}
			}
		}

		int k;
		cin >> k;

		for ( int i = 0; i < k; i++ )
		{
			int p, q, r;
			cin >> p >> q >> r;

			p--;
			q--;

			cout << G[p][q][r] << endl;
		}
	}

	return 0;
}

C++: #include<iostream>
using namespace std;
#include<algorithm>
#include<string>
#define REP(i,a) for(int  i=0;i<a;i++)
int A[101][101];
int B[101][101];
int main(){
	int a,b=0,c=0,d,n,m;	
	cin>>n>>m;
	while(n!=0||m!=0){
	REP(i,m){
		REP(j,m){
			A[i][j]=10001;
			B[i][j]=10001;
		}
		A[i][i]=0;
		B[i][i]=0;
	}
	REP(i,n){
	cin>>a>>b>>c>>d;
	A[a-1][b-1]=c;
	B[a-1][b-1]=d;	
	A[b-1][a-1]=c;
	B[b-1][a-1]=d;
	}
	REP(k,m){
		REP(i,m){
		if(i==k) continue;
	 		REP(j,m){
		if(i==j)continue;
		A[i][j]=min(A[i][j],A[i][k]+A[k][j]);
		B[i][j]=min(B[i][j],B[i][k]+B[k][j]);
			}
		}	
	}
	cin>>n;
	REP(i,n){
	cin>>a>>b>>c;
	if(c==0) cout<<A[a-1][b-1]<<endl;
	else cout<<B[a-1][b-1]<<endl;
	}
	cin>>n>>m;
	}
	return 0;
}