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
			c_matrix[b-1][a-1] = c
			t_matrix[a-1][b-1] = t
			t_matrix[b-1][a-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 <algorithm>
#define MAX_M 100
#define INF (1<<21)
using namespace std;

int dp_cost[MAX_M][MAX_M];
int dp_time[MAX_M][MAX_M];
int m;

void warshall_froyd(){
  for(int k=0;k<m;k++){
    for(int i=0;i<m;i++){
      for(int j=0;j<m;j++){
        dp_cost[i][j] = min(dp_cost[i][j], dp_cost[i][k] + dp_cost[k][j]);
        dp_time[i][j] = min(dp_time[i][j], dp_time[i][k] + dp_time[k][j]);
      }
    }
  }
}

int main(){
  int n;
  cin >> n >> m;
  for(int i=0;i<m;i++){
    for(int j=0;j<m;j++){
      dp_time[i][j] = (i==j ? 0 : INF);
      dp_cost[i][j] = (i==j ? 0 : INF);
    }
  }

  for(int i=0;i<n;i++){
    int a,b,cost,time;
    cin >> a >> b >> cost >> time;
    a--;
    b--;
    dp_cost[a][b] = cost; dp_cost[b][a] = cost;
    dp_time[a][b] = time; dp_time[b][a] = time;
  }
  
  warshall_froyd();

  int k,p,q,r;
  cin >> k;
  for(int i=0;i<k;i++){
    cin >> p >> q >> r;
    p--; q--;
    cout << (r == 0 ? dp_cost[p][q] : dp_time[p][q]) << endl;
  }
  cin >> p >> q;
  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]=1001;
			B[i][j]=1001;
		}
	}
	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(k,m){
		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]);
		A[j][i]=A[i][j];
		B[j][i]=B[i][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;
}

C++: #include <iostream>
#include <iomanip>
#include <vector>
#include <string>
#include <stack>
#include <set>
#include <cmath>
#include <algorithm>
using namespace std;

const int mx = 1<<28;

int cost[101][101];
int tIme[101][101];


int main(){
	int n , m;
	while(cin>>n>>m , n||m){
		for(int i=0;i<m;++i){
			for(int j=0;j<m;++j){
				cost[i][j]=mx;
				tIme[i][j]=mx;
			}
		}
		for(int i=0,a,b,c,t; i<n ; ++i){
			cin >> a >> b >> c >> t;
			a--; b--;
			cost[a][b]=c;
			cost[b][a]=c;
			tIme[a][b]=t;
			tIme[b][a]=t;
		}
		for(int i=0 ; i<m ; ++i ){
			for(int j=0 ; j<m ; ++j){
				for(int k=0 ; k<m ; ++k){
					cost[j][k]=min(cost[j][k] , cost[j][i]+cost[i][k]);
					tIme[j][k]=min(tIme[j][k] , tIme[j][i]+tIme[i][k]);
				}
			}
		}
		int k;
		cin >> k;
		for(int i=0 , p , q , r ; i<k ; ++i){
			cin >> p >> q >> r;
			p--; q--;
			cout << (r ? tIme[p][q] : cost[p][q] ) << endl;
		}
	}
	return 0; 
}

C++: #include <cstdio>
#include <algorithm>

using namespace std;

#define chmin(a,b) a=min(a,b)
#define rep(i,x) for(int i=0;i<(x);++i)

const int inf = 1e9;

int N, M;
int mc[100][100], mt[100][100];

int main()
{
	while (scanf("%d %d", &N, &M), N || M) {
		fill(mc[0], mc[M], inf);
		fill(mt[0], mt[M], inf);

		rep(i, M) mc[i][i] = mt[i][i] = 0;

		rep(i, N) {
			int a, b, cost, time; scanf("%d %d %d %d", &a, &b, &cost, &time); a--; b--;
			mc[a][b] = mc[b][a] = cost;
			mt[a][b] = mt[b][a] = time;
		}

		rep(k, M) rep(i, M) rep(j, M) {
			chmin(mc[i][j], mc[i][k] + mc[j][k]);
			chmin(mt[i][j], mt[i][k] + mt[j][k]);
		}

		int K; scanf("%d", &K);
		rep(i, K) {
			int p, q, r; scanf("%d %d %d", &p, &q, &r); p--; q--;
			printf("%d\n", r == 0 ? mc[p][q] : mt[p][q]);
		}
	}
}

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

using namespace std;

const int INF=1e9;

//struct edge{int to,cost,time;};
struct edge{int cost,time;};

int main(){
	int n,m;
	cin >> n >> m;

	//vector<edge> es[n];
	edge es[m][m];
	for(int i=0;i<m;i++){
		for(int j=0;j<m;j++) es[i][j] = (edge){INF,INF};
	}

	int a,b,cost,time;
	for(int i=0;i<n;i++){
		cin >> a >> b >> cost >> time;
	//	es[a].emplace_back((edge){b,cost,time});
		es[a-1][b-1] = (edge){cost,time};
		es[b-1][a-1] = es[a-1][b-1];
	}

	int d_cost[m][m];
	int d_time[m][m];
	for(int i=0;i<m;i++){
		for(int j=0;j<m;j++){
			d_cost[i][j] = es[i][j].cost;
			d_time[i][j] = es[i][j].time;
		}
	}

	for(int k=0;k<m;k++){
		for(int i=0;i<m;i++){
			for(int j=0;j<m;j++){
				d_cost[i][j] = min(d_cost[i][j],d_cost[i][k] + d_cost[k][j]);
				d_time[i][j] = min(d_time[i][j],d_time[i][k] + d_time[k][j]);
			}
		}
	}

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

		if(r==0) cout << d_cost[p-1][q-1] << "\n";
		else	cout << d_time[p-1][q-1] << "\n";
	}
	cin >> k >> k;

	return 0;
}