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<cstring>
using namespace std;
#define rep(i,n) for(int i=0;i<n;++i)
#define INF 300000

struct E
{
    int a,b,c,t;
    E(){};
    E(int a,int b,int c,int t):a(a),b(b),c(c),t(t){};
};
E cs[700];
unsigned int d[150];

int main()
{
    int n,m,k,p,q,r;
    while(cin >> n >> m)
    {
        if(n==0 && m==0)break;
        
        int ta,tb,tc,tt;
        rep(i,n)
        {
            cin >> ta>>tb>>tc >>tt;
            cs[2*i] = E(ta,tb,tc,tt);
            cs[2*i+1] = E(tb,ta,tc,tt);
        }

        cin >> k;
        rep(i,k)
        {
            memset(d,INF,150*sizeof(int));
            cin >> p >> q >>r;
            d[p] = 0;

            bool update = false;
            if(r==0)while(true)
            {
                update = false;
                rep(j,m*2)
                {
                   if(d[cs[j].a] != INF && d[cs[j].b] > d[cs[j].a] + cs[j].c)
                   {
                       update = true;
                       d[cs[j].b] =  d[cs[j].a] + cs[j].c;
                   }
                }
                if(!update) break;
            }
            if(r==1)while(true)
            {
                update = false;
                rep(j,m*2)
                {
                   if(d[cs[j].a] != INF && d[cs[j].b] > d[cs[j].a] + cs[j].t)
                   {
                       update = true;
                       d[cs[j].b] =  d[cs[j].a] + cs[j].t;
                   }
                }
                if(!update) break;
            }
            cout << d[q] << endl;
        }
        
    }

    return 0;
}

C++: // 0200.cpp : テ」ツδ。テ」ツつ、テ」ツδウ テ」ツδ療」ツδュテ」ツつクテ」ツつァテ」ツつッテ」ツδ?テ」ツδ陛」ツつ。テ」ツつ、テ」ツδォテ」ツ?ァテ」ツ?凖」ツ??

#include <iostream>
#include <cstring>

using namespace std;

const int INF=100000;
int cost[101][101];
int tim[101][101];

int main(void){
	int n,m,a,b,c;
	while(1){
		for(a=0;a<=100;a++){
			for(b=0;b<=100;b++){
				cost[a][b]=INF;
				tim[a][b]=INF;
				if(a==b)cost[a][b]=0,tim[a][b]=0;
			}
		}
		cin >> n >> m;
		if(n==0 && m==0)break;
		for(a=0;a<n;a++){
			int f,t,co,ti;
			scanf("%d%d%d%d",&f,&t,&co,&ti);
			if(cost[f][t]>co)cost[f][t]=co,cost[t][f]=co;
			if(tim[f][t]>ti)tim[f][t]=ti,tim[t][f]=ti;
		}
		for(c=1;c<=m;c++){
			for(b=1;b<=m;b++){
				for(a=1;a<=m;a++){
					cost[a][b]=min(cost[a][b],cost[a][c]+cost[c][b]);
					tim[a][b]=min(tim[a][b],tim[a][c]+tim[c][b]);
				}
			}
		}
		cin >> n;
		for(a=0;a<n;a++){
			int d,f,t;
			scanf("%d%d%d",&f,&t,&d);
			if(d==0)printf("%d\n",cost[f][t]);
			if(d==1)printf("%d\n",tim[f][t]);
		}
	}
    return 0;
}

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

using namespace std;
const int MAX_V = 101;
int d[MAX_V][MAX_V][2];
int V;

void wrshall_floyd(int r){
    for (int k = 0; k < V; ++k) {
        for (int i = 0; i < V; ++i) {
            for (int j = 0; j < V; ++j) {
                d[i][j][r]=min(d[i][j][r],d[i][k][r]+d[k][j][r]);
            }
        }
    }
}

int main(){
    for (int i = 0; i < MAX_V; ++i) {
        for (int j = 0; j < MAX_V; ++j) {
            d[i][j][1]=100000000;
            d[i][j][0]=100000000;
        }
    }
    int n,m;
    cin>>n>>m;
    V=n;
    for (int i = 0; i < n; ++i) {
        int a,b,c,t;
        cin>>a>>b>>c>>t;
        a--;b--;
        d[a][b][0]=d[b][a][0]=c;
        d[a][b][1]=d[b][a][1]=t;
    }
    wrshall_floyd(0);
    wrshall_floyd(1);
    int k;cin>>k;
    for (int i = 0; i < k; ++i) {
        int t,f,r;cin>>t>>f>>r;
        t--;f--;
        cout<<d[t][f][r]<<endl;
    }
}

C++: #include <iostream>
#include <cstring>
using namespace std;

#define FOR(i,k,n) for(int i = (k); i < (n); i++)
#define REP(i,n) FOR(i,0,n)
#define INF 0x3f
#define ll long long


int cost[101][101];
int time_[101][101];

int main()
{
	int n, m;
	while (cin>>n>>m)
	{
		if (n == 0 && m == 0) break;
		REP(i, 101)REP(j, 101)
		{
				cost[i][j] = INF;
				time_[i][j] = INF;
		}

		REP(i, n)
		{
			int a, b, c, t;
			cin >> a >> b >> c >> t;
			a--; b--;
			cost[a][b] = cost[b][a] = c;
			time_[a][b] = time_[b][a] = t;
		}

		REP(i, m)REP(j, m)REP(k, m)
		{
			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]);
		}
		int k;
		cin >> k;
		REP(i, k)
		{
			int p, q, r;
			cin >> p >> q >> r;
			p--; q--;
			if (r == 0) cout << cost[p][q] << endl;
			else cout << time_[p][q] << endl;
		}
	}
}