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 <cstdio>
#include <algorithm>
using namespace std;
int main(void){

	int n, m, a, b, cost, time, k, p, q, r;
	int d_cost[101][101], d_time[101][101];

	while (cin >> n >> m && n != 0 && m != 0){

		for (int i = 1; i < m + 1; i++){
			for (int j = 1; j < m + 1; j++){

				d_cost[i][j] = 1001;
				d_time[i][j] = 1001;
			}
		}

		for (int i = 0; i < n; i++){

			cin >> a >> b >> cost >> time;
			d_cost[a][b] = cost;
			d_cost[b][a] = cost;
			d_time[a][b] = time;
			d_time[b][a] = time;
		}

		/*cout << endl;
		for (int i = 1; i < m; i++){
			for (int j = 1; j < m; j++){

				printf("%5d", d_cost[i][j]);
			}
			cout << endl;
		}
		cout << endl;
		for (int i = 1; i < m; i++){
			for (int j = 1; j < m; j++){

				printf("%5d", d_time[i][j]);
			}
			cout << endl;
		}*/

		for (int i = 1; i < m + 1; i++){
			for (int j = 1; j < m + 1; j++){
				for (int k = 1; k < m + 1; k++){

					d_cost[j][k] = min(d_cost[j][k], d_cost[j][i] + d_cost[i][k]);
					d_time[j][k] = min(d_time[j][k], d_time[j][i] + d_time[i][k]);
				}
			}
		}

		cin >> k;

		for (int i = 0; i < k; i++){

			cin >> p >> q >> r;

			if (r == 0)
				cout << d_cost[p][q] << endl;
			else
				cout << d_time[p][q] << endl;
		}
	}
}

C++: #include <iostream>
#include <algorithm>
#define INF 10000000
using namespace std;
int cost[101][101];
int t_cost[101][101];
int main(){
  int n,m;
  while(cin >> n >> m , n+m ){
    m++;
    for(int i = 0  ; i < m ; i++ ){
      for(int j = 0  ; j < m ; j++ ){
	if(i == j)cost[i][j] = 0;
	else cost[i][j] = INF; 
	if(i == j)t_cost[i][j] = 0;
	else t_cost[i][j] = INF; 
      }
    }
    for(int i = 0 ; i < n ; i++ ){
      int a,b,c,d;
      cin >> a >> b >> c >> d;
      cost[a][b] = cost[b][a] = c;
      t_cost[a][b] = t_cost[b][a] = d;  
    }
    for(int i = 0 ; i < m ; i++ ){
      for(int j = 0 ; j < m ; j++ ){
	for(int k = 0 ; k < m ; k++ ){
	  cost[i][j] = min(cost[i][j],cost[i][k] + cost[k][j]);
	  t_cost[i][j] = min(t_cost[i][j],t_cost[i][k] + t_cost[k][j]);
	}
      }
    }
    int k;
    cin >> k;
    for(int i = 0 ; i < k ; i++ ){
      int from,to,r;
      cin >> from >> to >> r; 
      if(r == 0){
	cout << cost[from][to] << endl;
      } else {
	cout << t_cost[from][to] << endl;
      }
    }
  }
  return 0;
}

C++: #include<iostream>
#include<map>
#include<queue>
#include<vector>
using namespace std;
#define fr first
#define sc second
typedef pair<int,int>Pi;
struct edge{
  int to,element/*時間もしくは金額*/;
};
typedef vector< vector< edge > > Graph;

int dijkstr(Graph& info, int s, int g){
  vector<int> min_cost;
  priority_queue<Pi, vector<Pi>, greater<Pi> >que;
  min_cost.resize(info.size(),-1);
  que.push( Pi(0,s) ); //firstが時間(金額) , secondが場所
  min_cost[s]=0;
  while(!que.empty()){
    Pi p = que.top();
    que.pop();
    if(p.sc == g) return p.fr; //ゴールに着いたら
    if(p.fr > min_cost[p.sc]) continue; //現在地が前にきたときの最小より大きかった場合continue
    for(int i=0;i<info[p.sc].size();i++){ //現在地からの道の数だけ回る
      edge& e = info[p.sc][i];
      if(min_cost[e.to] == -1 || p.fr + e.element < min_cost[e.to]){ //次の場所はまだコストを調べていない || 次の場所の最小値よりも移動後のコストが小さい場合。
	min_cost[e.to] = p.fr + e.element;
	que.push( Pi(min_cost[e.to] , e.to));
      }
    }
  }
  return min_cost[g];
}

int main(){
  int n,m;
  while(1){
    cin >> n >> m;
    if(n==0 && m==0) break;
    Graph info[2];
    info[0].resize(n);
    info[1].resize(n);
    
    int a,b,COST,TIME;
    for(int i=0;i<n;i++){
      cin >> a >> b >> COST >> TIME;
      info[0][a].push_back( (edge){b, COST} );
      info[0][b].push_back( (edge){a, COST} );
      info[1][a].push_back( (edge){b, TIME} );
      info[1][b].push_back( (edge){a, TIME} );
    }
    
    int k,p,q,r;
    cin >> k;
    for(int i=0;i<k;i++){
     cin >> p >> q >> r;
     cout << dijkstr(info[r],p,q) << endl;
    }
  }
}

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]=10002;
			B[i][j]=10002;
		}
		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;
}