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 <vector>
#include <queue>
#include <algorithm>
#include <numeric>
using namespace std;


class Edge {
public:
    int sid, cost, time;
    Edge(int s, int c, int t) {
        sid = s;
        cost = c;
        time = t;
    }
};


class Node {
public:
    static int mode;
    int sid, cost, time;
    bool visited;
    vector<Edge*> edge;

    bool operator() (Node *a, Node *b) {
        return Node::mode == 0 ? a->cost > b->cost: a->time > b->time;
    }
};
int Node::mode = 0;


int main() {
    Node node, station[101], *s;
    priority_queue<Node*, vector<Node*>, Node> pq(node);
    int n, m, s1, s2, i, cost, time, k, p, q;

    while (cin >> n >> m && n) {
        for (i = 1; i <= m; i++) {
            station[i].sid = i;
            station[i].edge.clear();
        }
        for (i = 0; i < n; i++) {
            cin >> s1 >> s2 >> cost >> time;
            station[s1].edge.push_back(new Edge(s2, cost, time));
            station[s2].edge.push_back(new Edge(s1, cost, time));
        }

        cin >> k;
        while (k--) {
            for (i = 1; i <= m; i++) {
                station[i].cost = 3000000;
                station[i].time = 3000000;
                station[i].visited = false;
            }
            cin >> p >> q >> Node::mode;
            s = &station[p];
            s->cost = 0;
            s->time = 0;
            pq = priority_queue<Node*, vector<Node*>, Node>(node);
            pq.push(s);
            while (!pq.empty()) {
                s = pq.top(); pq.pop();
                if (s->sid == q) break;
                if (s->visited) continue;
                s->visited = true;
                for (vector<Edge*>::iterator e = s->edge.begin(); e != s->edge.end(); e++) {
                    Node *ds = &station[(*e)->sid];
                    if (Node::mode == 0) {
                        cost = s->cost + (*e)->cost;
                        if (cost < ds->cost) {
                            ds->cost = cost;
                            pq.push(ds);
                        }
                    }
                    else {
                        time = s->time + (*e)->time;
                        if (time < ds->time) {
                            ds->time = time;
                            pq.push(ds);
                        }
                    }
                }
            }
            cout << (Node::mode == 0 ? s->cost: s->time) << endl;
        }
    }

    return 0;
}

C++: #include<iostream>
#include<string.h>
using namespace std;
int kingaku(void);
int saitan(void);
#define WHITE 0
#define GLAY 1
#define BLACK 2
#define INF 999999
int n;	//	??????????????±?????°
int m;	//	?§??????°
int p;	//	????????°
int q;	//	??°?????°
int minv;
int cost[100][100];
int time[100][100];
int dd[100],Flag[100];
int main()
{
	int a,b,c,t,k,r;
	while(1){
		memset(cost,INF,sizeof(cost));
		memset(time,INF,sizeof(time));
		memset(Flag,0,sizeof(Flag));

		cin >> n >> m;
		if(n == 0 && m == 0) break;
		for(int i=0;i<n;i++){
			cin >> a >> b >> c >>t;
			cost[a][b] = cost[b][a] = c;
		time[a][b] = time[b][a] = t;
		}
		cin >> k;
		for(int i=0;i<k;i++){
			cin >> p >> q >> r;
			if(r == 0)
				cout << kingaku() << endl;
			else if(r == 1)
				cout << saitan() << endl;
			//for(int i=1;i<=m;i++)
			//	cout << i << " " << dd[i] << endl;
		}
	}
	return 0;
}

int kingaku()
{
	int u;
	int color[100];
	memset(dd,INF,sizeof(dd));
	memset(color,WHITE,sizeof(color));
	dd[p] = 0;
	color[p] = GLAY;
	while(1){
		u = -1;
		minv = INF;
		for(int i=1;i<=m;i++){
			if(minv > dd[i] && color[i] != BLACK){
				minv = dd[i];
				u = i;
			}
		}
		if(u==-1) break;
		color[u] = BLACK;
		for(int i=1;i<=m;i++){
			if(cost[u][i] != INF && color[i] != BLACK){
				if(dd[i] > dd[u] + cost[u][i])	//
					     //1?§?     1?§???¨??\?????????????§?
					dd[i] = dd[u] + cost[u][i];
			}
		}
	}
	return dd[q];
}

int saitan()
{
	int u;
	int color[100];
	memset(dd,INF,sizeof(dd));
	memset(color,WHITE,sizeof(color));
	dd[p] = 0;
	color[p] = GLAY;
	while(1){
		u = -1;
		minv = INF;
		for(int i=1;i<=m;i++){
			if(minv > dd[i] && color[i] != BLACK){
				minv = dd[i];
				u = i;
			}
		}
		if(u==-1) break;
		color[u] = BLACK;
		for(int i=1;i<=m;i++){
			if(time[u][i] != INF && color[i] != BLACK){
				if(dd[i] > dd[u] + time[u][i])
					dd[i] = dd[u] + time[u][i];
			}
		}
	}
	return dd[q];
}