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<cstdio>
#include<cstring>
#include<algorithm>
#include<functional>
#define M 2100000
using namespace std;
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 kin[101][101],zi[101][101];
	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>
#include <vector>
using namespace std;

int main(){
  int n, m, kk;
  const int INF = 1 << 28;

  while(cin >> n >> m){
    if((n|m) == 0) break;

    vector<vector<vector<int> > > score(2, vector<vector<int> >(m, vector<int>(m, INF)));
    int a, b, cost, time;

    for(int i=0; i<n; i++){
      cin >> a >> b >> cost >> time;
      a--;
      b--;
      score[0][a][b] = score[0][b][a] = cost;
      score[1][a][b] = score[1][b][a] = time;
    }

    for (int k = 0; k < m; ++k) {
      for (int i = 0; i < m; ++i) {
	for (int j = 0; j < m; ++j) {
	  score[0][i][j] = min(score[0][i][j], score[0][i][k]+score[0][k][j]);
	  score[1][i][j] = min(score[1][i][j], score[1][i][k]+score[1][k][j]);
	}
      }
    }

    int p, q, r;

    cin >> kk;
    while(kk--){
      cin >> p >> q >> r; 
      --q;
      --p;
      cout << score[r][p][q] << endl;
    }
  }
    return 0;
}

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

int INF=1e9;


int main(){
    while(true){
        vector<vector<int>> T(1000,vector<int>(1000,INF)); 
        vector<vector<int>> C(1000,vector<int>(1000,INF));
        int n,m;
        cin>>n>>m;
        if(n==0&&m==0) break;
        
        for(int i=0;i<n;i++){
            int a,b,Cost,Time;
            cin>>a>>b>>Cost>>Time;
            T[a][b]=Time;
            C[a][b]=Cost;
            T[b][a]=Time;
            C[b][a]=Cost;
        }

        
        int k;
        cin>>k;
        for(int i=0;i<k;i++){
            vector<int> d(1000,INF);
            vector<bool>  u(1000,false);
            int p,q,r;
            cin>>p>>q>>r;
            d[p]=0;
            
            if(r){
                while(true){
                    int v=-1;
                    for(int j=1;j<=m;j++){
                        if(u[j]) continue;
                        if(v==-1||d[j]<d[v]) v=j;
                    }

                    if(v==-1) break;
                    u[v]=true;

                    for(int l=1;l<=m;l++){
                        if(d[l]>d[v]+T[v][l]){
                            d[l]=d[v]+T[v][l];
                        }
                    }
                }
                cout<<d[q]<<endl;   
            }else{
                while(true){
                    int v=-1;
                    for(int j=1;j<=m;j++){
                        if(u[j]) continue;
                        if(v==-1||d[j]<d[v]) v=j;
                    }

                    if(v==-1) break;
                    u[v]=true;

                    for(int l=1;l<=m;l++){
                        if(d[l]>d[v]+C[v][l]){
                            d[l]=d[v]+C[v][l];
                        }
                    }
                }
                cout<<d[q]<<endl;      
            }
            
        }
    }

    return 0;
}