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]
					t_newlen := t_dist[i][k] + t_dist[k][j]
					if c_newlen < c_dist[i][j] {
						c_dist[i][j] = c_newlen
						c_prev[i][j] = c_prev[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 <stdio.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <limits.h>
#include <cctype>

#include <iostream>
#include <vector>
#include <deque>
#include <queue>
#include <map>
#include <algorithm>


using namespace std;

#define Max INT_MAX
#define Inf INT_MIN


#define rep(i, n) for(int i = 0; i < n; i++)
#define repi(i,l,n) for(int (i)=(int)(l);(i)<(int)(n);(i)++)
// s <= x < g ?
#define IN(x,s,g) ((x) >= (s) && (x) < (g))
// 0 <= x < w && 0 <= y < h ?
#define ISIN(x,y,w,h) (IN((x),0,(w)) && IN((y),0,(h)))



struct edge {
    int to, cost;
    edge(int t, int c){
        to = t;
        cost = c;
    }
};

//first=最短距離 second=頂点の番号
typedef pair<int, int> P;

int d[100];


//sからの最短距離をdに格納する
void dijkstra(int s, vector<edge> *G ){
    //フロンティア頂点集合
    priority_queue<P, vector<P>, greater<P> > que; //小さい順指定
    fill(d, d+100, Max);

    d[s] = 0;
    que.push( P(0,s) ); //s -> sは距離0

    while(!que.empty() ) {
        P p = que.top(); que.pop(); //フロンティアの中から一番小さい辺を取り出す 
        int v = p.second;
        if( d[v] < p.first) continue;

        rep(i, G[v].size() ) {
            edge e = G[v][i];
            //cout << "i = " << i << endl;
            //cout << "G[v][i].to = " << G[v][i].to<< endl;
            //cout << "G[v][i].cost = " << G[v][i].cost << endl;

            //cout << "v = " << v << endl; 
            //cout << "d[v] = " << d[v] << endl;
            //cout << "e.to = " << e.to << endl;
            //cout << "e.cost = " << e.to << endl;
            //cout << "d[e.to] = " << d[e.to] << endl;
            if( d[e.to] > d[v] + e.cost){
                d[e.to] = d[v] + e.cost;
                que.push( P(d[e.to], e.to) );
            }
        }
    }
}

vector<edge> costs[100];
vector<edge> times[100];

int main()
{
    int tmp = 0;

    int n,m;
    cin >> n >> m;
    rep(i,n){
        int a,b, cost_v,time_v;
        cin >> a >> b >> cost_v >> time_v;
        //edge ee = edge(b,cost_v);
        //cout << "ee.to = "  << ee.to << endl; 
        //cout << "ee.cost = " << ee.cost << endl;
        costs[a].push_back( edge(b, cost_v) );
        times[a].push_back( edge(b, time_v) );

        //cout << "_cost = " << cost_v << endl;
        //cout << "_time = " << time_v << endl;
        //cout << "a,b = " << a << " " << b << endl;
        //cout << endl;
    }

    int k;
    cin >> k;

    rep(i,k){
        int p,q,r;
        cin >> p >> q >> r;
        if( r == 0){
            dijkstra(p, costs);
        } else {
            dijkstra(p, times);
        }
        cout << d[q] << endl;
    }
    return 0;


}

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

#define N 101
#define inf 1000000

using namespace std;

int main()
{
  int n, m, a, b, p, q, r, cs, tm;
  int cost[N][N], time[N][N];

  while(cin>>n>>m && n+m){
    fill(&cost[0][0], &cost[m][m], inf);
    fill(&time[0][0], &time[m][m], inf);

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

    while(n--){
      cin >> a >> b >> cs >> tm;
      cost[a][b] = cost[b][a] = cs;
      time[a][b] = time[b][a] = tm;
    }
    
    // warshall-floyd
    for(int k = 1; k <= m; ++k)
      for(int i = 1; i <= m; ++i)
	for(int j = 1; j <= m; ++j){
	  cost[i][j] = min(cost[i][j], cost[i][k]+cost[k][j]);
	  time[i][j] = min(time[i][j], time[i][k]+time[k][j]);
	}

    cin >> n;
    while(n--){
      cin >> p >> q >> r;
      cout << ((r)? time[p][q]: cost[p][q]) << endl;
    }
  }

  return 0;
}

C++: #include <iostream>
#include <vector>
#include <map>
#include <queue>
#include <algorithm>
using namespace std;

struct Edge{
	int to, cost, time;
};

typedef pair<int, int> P;

const int MAX_V = 110;
const int INF = 1 << 30;

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

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

		vector<Edge> vec[MAX_V];
		int d[MAX_V];

		for(int i = 0; i < n; ++i){
			int a, b, c, t;
			cin >> a >> b >> c >> t;
			--a, --b;
			vec[a].push_back(Edge{b, c, t});
			vec[b].push_back(Edge{a, c, t});
		}

		int k;
		cin >> k;

		while(k > 0){
			--k;
			priority_queue<P, vector<P>, greater<P> > que;
			fill(d, d + n, INF);

			int p, q, r;
			cin >> p >> q >> r;
			--p, --q;

			d[p] = 0;
			que.push(P(0, p));

			while(!que.empty()){
				P p0 = que.top();
				que.pop();
				int v = p0.second;
				if(d[v] < p0.first) continue;
				for(int i = 0; i < vec[v].size(); ++i){
					Edge e = vec[v][i];
					if(r == 0 && d[e.to] > d[v] + e.cost){
						d[e.to] = d[v] + e.cost;
						que.push(P(d[e.to], e.to));
					}
					if(r == 1 && d[e.to] > d[v] + e.time){
						d[e.to] = d[v] + e.time;
						que.push(P(d[e.to], e.to));
					}
				}
			}

			cout << d[q] << endl;
		}
	}

	return 0;
}