Go: // Warshall–Floyd Algorithm

package main

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

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
				} else {
					c_dist[i][j] = c_matrix[i][j]
				}
				if c_matrix[i][j] == 0{
					c_prev[i][j] = -1
				} else {
					c_prev[i][j] = i
				}
				if t_matrix[i][j] == 0{
					t_dist[i][j] = INF
				} else {
					t_dist[i][j] = t_matrix[i][j]
				}
				if t_matrix[i][j] == 0{
					t_prev[i][j] = -1
				} else {
					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<bits/stdc++.h>
using namespace std;
typedef struct E{
  int to,cost,tim;
}edge;
vector<vector<edge> >root(310);
int d[2][301];
void dijkstraco(int s){
  priority_queue<pair<int,int>,vector<pair<int,int> >,greater<pair<int,int> > >que;
  d[0][s] = 0;
  que.push(pair<int,int>(0,s));
  while(!que.empty()){
    pair<int,int> p=que.top();que.pop();
    int v = p.second;
    if(d[0][v]<p.first)continue;
    for(int j=0;j<root[v].size();j++){
      edge t = root[v][j];
      if(d[0][t.to]>d[0][v]+t.cost){
	d[0][t.to]=d[0][v]+t.cost;
	que.push(pair<int,int>(d[0][t.to],t.to));
      }
    }
  }
}
void dijkstrati(int s){
  priority_queue<pair<int,int>,vector<pair<int,int> >,greater<pair<int,int> > >que;
  d[1][s] = 0;
  que.push(pair<int,int>(0,s));
  while(!que.empty()){
    pair<int,int> p=que.top();que.pop();
    int v = p.second;
    if(d[1][v]<p.first)continue;
    for(int j=0;j<root[v].size();j++){
      edge t = root[v][j];
      if(d[1][t.to]>d[1][v]+t.tim){
	d[1][t.to]=d[1][v]+t.tim;
	que.push(pair<int,int>(d[1][t.to],t.to));
      }
    }
  }
}
int main(){
  int n,m;
  while(cin>>n>>m,n+m!=0){
      for(int j=0;j<2;j++){
	for(int a=0;a<301;a++)
	  d[j][a]=1000000000;
      }
    for(int i=0;i<n;i++){
      int f;cin>>f;
      edge e;cin>>e.to>>e.cost>>e.tim;
      root[f].push_back(e);
      int tmp=f;
      f=e.to;
      e.to=tmp;
      root[f].push_back(e);
    }
    int k;cin>>k;
    for(int i=0;i<k;i++){

      int p,q,r;cin>>p>>q>>r;
      if(r==0)
	dijkstraco(p);
      else
	dijkstrati(p);
      cout<<d[r][q]<<endl;
    }
  }
  return 0;
}

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[101];
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 <iostream>
#include <algorithm>

using namespace std;

int main() {
	int n, m, k;

	while(cin >> n >> m ) {

	if (n == 0 && m == 0) return 0;

	int **costs = new int*[n];
	int **times = new int*[n];
	for(int i = 0; i < n; i++) {
		costs[i] = new int[n];
		times[i] = new int[n];
		for(int j = 0; j < n; j++) {
			costs[i][j] = 1e5;
			times[i][j] = 1e5;
		}
	}

	for(int i = 0; i < n; i++) {
		int a, b, cost, time;
		cin >> a >> b >> cost >> time;
		a -= 1;
		b -= 1;
		costs[a][b] = costs[b][a] = cost;
		times[a][b] = times[b][a] = time;
	}

	for(int i = 0; i < n; i++) {
		for(int j = 0; j < n; j++) {
			for(int k = 0; k < n; k++) {
				costs[j][k] = min(costs[j][k], costs[j][i] + costs[i][k]);
				times[j][k] = min(times[j][k], times[j][i] + times[i][k]);
			}
		}
	}

	cin >> k;
	for(int i = 0; i < k; i++) {
		int p, q, r;
		cin >> p >> q >> r;
		p -= 1;
		q -= 1;
		if(r) cout << times[p][q];
		else cout << costs[p][q];
		cout << endl;
	}
	}
	return 0;
}