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 <iostream>
#include <cstdio>
using namespace std;
#define rep(i,a) for(int i=0;i<a;i++)
int main(){
	int n,m;
	int a,b,c,t,r;
	while(cin >> m >> n && n){
		int time[n][n],cost[n][n];
		rep(i,n)rep(j,n)time[i][j]=cost[i][j]=(1<<21);
		rep(i,n)time[i][i]=cost[i][i]=0;
		rep(i,m){
			cin >> a >> b >> c >> t;
			a--;b--;
			cost[a][b]=cost[b][a]=c;
			time[a][b]=time[b][a]=t;
		}
		rep(k,n)rep(i,n)rep(j,n){
			cost[i][j]=cost[j][i]=min(cost[i][j],cost[i][k]+cost[k][j]);
			time[i][j]=time[j][i]=min(time[i][j],time[i][k]+time[k][j]);
		}
		cin >> m;
		rep(i,m){
			cin >> a >> b >> r;
			a--;b--;
			printf("%d\n",r?time[a][b]:cost[a][b]);
		}
	}
}

C++: #include<cstdio>
#include<cstring>
#include<algorithm>
#include<functional>
#define M 2100000
using namespace std;	
int kin[1001][1001],zi[1001][1001];
int main(void)
{
	int i,j,n,k,m,a[1001],b[1001],cost[1001],time[1001],kk,pp,bre;
	int p,q,r;

	int flg[10001],leng[10001],min;
	int kaku,skin,szi;
	
	while(1) {
		scanf("%d %d",&n,&m);
		if(n==0 && m==0) break;
		for(i=1;i<=n;i++) scanf("%d %d %d %d",&a[i],&b[i],&cost[i],&time[i]);
		
		
		/**/
		//??£??\????????????  ??????
		for(i=1;i<=m;i++) {
			for(j=1;j<=m;j++) {
				kin[i][j]=M;
			}
		}
		for(i=1;i<=m;i++) kin[i][i]=0;
		for(i=1;i<=n;i++) {
			kin[a[i]][b[i]]=cost[i];
		}
		//??£??\???????????????
		for(i=1;i<=m;i++) {
			for(j=1;j<=m;j++) {
				zi[i][j]=M;
			}
		}
		for(i=1;i<=m;i++) zi[i][i]=0;
		for(i=1;i<=n;i++) {
			zi[a[i]][b[i]]=time[i];
		}
		/**/
		scanf("%d",&k);
		for(i=1;i<=k;i++) {
			scanf("%d %d ",&p,&q);
			scanf("%d",&r);
			for(j=1;j<=m;j++) {
				leng[j]=M;
				flg[j]=0;
			}
			pp=p;
			leng[pp]=0;
			if(r==0) {
				for(j=1;j<=m;j++) {
					min=M;
					for(kk=1;kk<=m;kk++) {
						if(flg[kk]==0 && leng[kk]<min) {
							kaku=kk;
							min=leng[kk];
						}
					}
					flg[kaku]=1;
					for(kk=1;kk<=m;kk++) {
						if((leng[kaku]+kin[kaku][kk])<leng[kk]) leng[kk]=leng[kaku]+kin[kaku][kk];
					}
				}
				printf("%d\n",leng[q]);
			}
			else {
				for(j=1;j<=m;j++) {
					min=M;
					for(kk=1;kk<=m;kk++) {
						if(flg[kk]==0 && leng[kk]<min) {
							kaku=kk;
							min=leng[kk];
						}
					}
					flg[kaku]=1;
					for(kk=1;kk<=m;kk++) {
						if((leng[kaku]+zi[kaku][kk])<leng[kk]) leng[kk]=leng[kaku]+zi[kaku][kk];
					}
				}
				printf("%d\n",leng[q]);
			}
		}

	/*	//cost
		printf("??????\n");
		printf("      ");
		for(i=1;i<=m;i++) printf("%7d ",i);
		printf("\n");
		printf("\n");
		for(i=1;i<=m;i++) {
			printf("%7d  ",i);
			for(j=1;j<=m;j++) {
				printf("%7d ",kin[i][j]);
			}
			printf("\n");
		}
		printf("\n");
		printf("\n");
		//time
		printf("??????\n");
		printf("      ");
		for(i=1;i<=m;i++) printf("%7d ",i);
		printf("\n");
		printf("\n");
		for(i=1;i<=m;i++) {
			printf("%7d  ",i);
			for(j=1;j<=m;j++) {
				printf("%7d ",zi[i][j]);
			}
			printf("\n");
		}
		printf("\n");*/
	}
		return 0;
}

C++: #include<iostream>
#include<algorithm>
using namespace std;
#define MAX 1000000
int main(){
	int n, m, a, b, cost, ti, k, p, q, r, point = 0;
	int cost_[101][101], time_[101][101];
	while ( cin >> n >> m && (n != 0 && m != 0)){
		for (int i = 0; i < m; i++)
		for (int j = 0; j < m; j++) { cost_[i][j] = time_[i][j] = MAX; }
		for (int i = 0; i < n; i++){
			cin >> a >> b >> cost >> ti;
			cost_[a-1][b-1] = cost;
			time_[a-1][b-1] = ti;
		}
		for (int i = 0; i < m; i++){
			for (int j = 0; j < m; j++){
				for (int o = 0; o < m; o++){
						cost_[j][o] = min(cost_[j][o], cost_[j][i] + cost_[i][o]);
						time_[j][o] = min(time_[j][o], time_[j][i] + time_[i][o]);
				}
			}
		}cin >> k;
		for (int i = 0; i < k; i++){
			cin >> p >> q >> r;
			if (r != 1) cout << cost_[p-1][q-1] << endl;
			else cout << time_[p-1][q-1] << endl;
		}
	}
	return 0;
}

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

const int INF = 1000000000;

int main(){
    while (true){
        int n,m;
        cin >> n >> m;

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

        int C[100][100];
        int T[100][100];

        for(int i=0; i<m; i++){
            for(int j=0; j<m; j++){
                if(i == j){
                    C[i][j] == T[i][j] == 0;
                }
                else{
                    C[i][j] = T[i][j] = INF;
                }
            }
        }

        for(int i=0; i<n; i++){
            int a,b,c,t;
            cin >> a >> b >> c >> t;

            C[a-1][b-1] = C[b-1][a-1] = c;
            T[a-1][b-1] = T[b-1][a-1] = t;
        }


    for(int k=0; k<m; k++){
        for(int i=0; i<m; i++){
            for(int j=0; j<m; j++){
                if(C[i][j]>C[i][k]+C[k][j]){
                        C[i][j] = C[i][k]+C[k][j];
                }
                if(T[i][j]>T[i][k]+T[k][j]){
                        T[i][j] = T[i][k]+T[k][j];
                }
            }
        }
    }

    
    int k;
    cin >> k;

    for(int i=0; i<k; i++){
        int p,q,r;
        cin >> p >> q >> r;

        if(r == 0){
            cout << C[p-1][q-1] << endl;

        }
        else{
            cout << T[p-1][q-1] << endl;
        }
    }
    
    }
    return 0;
}