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 <bits/stdc++.h>

using namespace std;

const int INF = 1 << 24;

struct Node {
    int dist, time;
    Node(int d, int t) : dist(d), time(t) {}
};

int main() {

    int n, m, a, b, d, t;
    int k, p, q, r;


    while(cin >> n >> m, n | m) {

        vector<vector<Node> > node(100, vector<Node>(100, Node(INF, INF)));

        for(int i = 0; i < m; ++i) {
            node[i][i].dist = 0;
            node[i][i].time = 0;
        }

        for(int i = 0; i < n; ++i) {
            cin >> a >> b >> d >> t;
            --a;
            --b;
            node[a][b].dist = d;
            node[a][b].time = t;
            node[b][a].dist = d;
            node[b][a].time = t;
        }

        for(int i = 0; i < m; ++i) {
            for(int j = 0; j < m; ++j) {
                for(int k = 0; k < m; ++k) {
                    node[j][k].dist = min(node[j][k].dist, node[j][i].dist + node[i][k].dist);
                    node[j][k].time = min(node[j][k].time, node[j][i].time + node[i][k].time);
                }
            }
        }

        cin >> k;

        for(int i = 0; i < k; ++i) {
            cin >> p >> q >> r;
            --p;
            --q;
            if(r == 0) {
                cout << node[p][q].dist << endl;
            } else {
                cout << node[p][q].time << endl;
            }
        }

    }

}

C++: #include<stdio.h>
#define INF 10000000
typedef struct{
	short to,cost,time;
}edge;
int n,m;
int i,j,k;
int p,q,r;
edge e[100][3000];
int ce[100];
bool used[100];
int d[100];

int min(int a,int b){return a<b?a:b;}

int solve(int p,int q,int r){
	int l;
	for(l=0;l<m;l++){
		used[l]=false;
		d[l]=INF;
	}
	d[p]=0;
	int next;
	while(1){
		next=-1;
		for(l=0;l<m;l++){
			if(!used[l]&&(next==-1||d[next]>d[l]))next=l;
		}
		if(next==-1)break;
		used[next]=true;
		for(l=0;l<ce[next];l++){
			if(r==0)d[e[next][l].to]=min(d[e[next][l].to],d[next]+e[next][l].cost);
			if(r==1)d[e[next][l].to]=min(d[e[next][l].to],d[next]+e[next][l].time);
		}
	}
	return d[q];
}

int main(){
	while(1){
		scanf("%d %d",&n,&m);
		if(n==0&&m==0)return 0;
		for(i=0;i<m;i++)ce[i]=0;
		for(i=0;i<n;i++){
			int a,b,cost,time;
			scanf("%d %d %d %d",&a,&b,&cost,&time);
			e[a-1][ce[a-1]].to=b-1;
			e[a-1][ce[a-1]].cost=cost;
			e[a-1][ce[a-1]].time=time;
			e[b-1][ce[b-1]].to=a-1;
			e[b-1][ce[b-1]].cost=cost;
			e[b-1][ce[b-1]].time=time;
			ce[a-1]++;
			ce[b-1]++;
		}
		scanf("%d",&k);
		for(i=0;i<k;i++){
			scanf("%d %d %d",&p,&q,&r);
			printf("%d\n",solve(p-1,q-1,r));
		}
	}
}

C++: #include<iostream>
#include<stack>
#include<queue>
#include<map>
#include<queue>
#include<algorithm>
#include<cstdio>
#include<cstring>
using namespace std;

#define rep(i,n) for(int i=0;i<n;i++)
#define REP(n) for(int i=0;i<n;i++)

const int maxn=301,maxm=101,INF = 310000;
const int COST = 0, TIME = 1;

int n,m;

struct edge
{
    unsigned int to,cost;
    edge(int to,int cost):to(to),cost(cost){};
};

typedef pair<int,int> p;

int main()
{
    while(cin >> n >> m && (n||m))
    {
        vector<edge> cost[2][maxm];
        int a,b,tc,tt;
        REP(n)
        {
            cin >> a >> b >> tc >> tt;
            cost[TIME][a].push_back(edge(b,tt));
            cost[TIME][b].push_back(edge(a,tt));
            cost[COST][a].push_back(edge(b,tc));
            cost[COST][b].push_back(edge(a,tc));
        }

        int k; cin >> k;

        int start,goll,r;
        while(k--)
        {
            cin >> start >> goll >> r;
            int d[maxm] = {};
            memset(d,INF,sizeof(d));
            d[1] = 0;

            priority_queue<p,vector<p>, greater<p> > que;
            que.push(p(0,start) );

            while(!que.empty())
            {
                p tp = que.top(); que.pop();
                int v = tp.second; //確定ノード
                if(d[v] < tp.first) continue;
                REP(cost[r][v].size())
                {
                    edge e = cost[r][v][i];
                    if(d[e.to] > d[v] + e.cost)
                    {
                        d[e.to] = d[v] + e.cost;
                        que.push(p(d[e.to], e.to));
                    }
                }
            }
            cout << d[goll] << endl;
        }
    }

    return 0;
}