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>
using namespace std;
const int INF = 1 << 22;
int main(){
  int n, m;
  while(true){
    cin >> n >> m;
    if(n == 0 && m == 0){
      break;
    }
    int cost[m+1][m+1], time[m+1][m+1];
    for(int i = 0; i < m+1; ++i){
      for(int j = 0; j < m+1; ++j){
        cost[i][j] = time[i][j] = INF;
      }
    }
    for(int i = 0; i < n; ++i){
      int a, b, c, t;
      cin >> a >> b >> c >> t;
      cost[a][b] = cost[b][a] = c;
      time[a][b] = time[b][a] = t;
    }
    // Warshall-Floyd
    for(int k = 0; k < m+1; ++k){
      for(int i = 1; i < m+1; ++i){
        for(int j = 1; j < m+1; ++j){
          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 q_num;
    cin >> q_num;
    for(int i = 0; i < q_num; ++i){
      int p, q, r;
      cin >> p >> q >> r;
      if(r == 0){
        cout << cost[p][q] << endl;
      }
      else{
        cout << time[p][q] << endl;
      }
    }
  }    
  return 0;
}

C++: #include<stdio.h>
#include<algorithm>
#include <map>
#include <list>
#include <stack>
#include <queue>
#include <vector>
#include <iostream>
#include <functional>
#include <time.h>
using namespace std;
clock_t fi, endtime;

const int INF = 100 * 1000 + 2;
const int r_c = 0;
const int r_t = 1;
const int MAX_V = 100;
const int MAX_E = 6000;

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

int wft[MAX_V][MAX_V] = { 0 };
int wfc[MAX_V][MAX_V] = { 0 };

int main()
{
	scanf("%d %d", &m, &n);
	for (int i = 0; i < n; ++i) {
		for (int j = 0; j < n; ++j) {
			wfc[i][j] = INF; wft[i][j] = INF;
		}
	}

	for (int i = 0; i < m; ++i) {
		scanf("%d %d %d %d", &a, &b, &c, &t);
		wft[a - 1][b - 1] = t;  wft[b - 1][a - 1] = t;
		wfc[a - 1][b - 1] = c;  wfc[b - 1][a - 1] = c;
	}
	for (int k = 0; k < n; ++k) {
		for (int i = 0; i < n; ++i) {
			for (int j = 0; j < n; ++j) {
				if (wft[i][j] > wft[i][k] + wft[k][j]) { wft[i][j] = wft[i][k] + wft[k][j]; }
				if (wfc[i][j] > wfc[i][k] + wfc[k][j]) { wfc[i][j] = wfc[i][k] + wfc[k][j]; }
			}
		}
	}
	scanf("%d", &k);
	int ans = 0;
	for (int i = 0; i < k; ++i){
		scanf("%d %d %d", &p, &q, &r);
		if (p == 0 && q == 0) break;
		if (r == 0) { ans = wfc[p - 1][q - 1]; }
		else { ans = wft[p - 1][q - 1]; }
		printf("%d\n", ans);
	}

}

C++: #include <iostream>
#include <cstdio>
#include <limits.h>
using namespace std;


				
int main()
{
	int n,m,a,b,co,ti,p,r;
	int money[300][300];
	int time[300][300];

	while(cin >> n >> m && n && m)
	{
		/*[m-1][m-1]ツづ慊づづ個配ツ療アツづーツ渉可甘コツ可サ*/
		for(int i=0;i<m;i++)
			for(int j=0;j<m;j++)
				time[i][j]=money[i][j]= (i-j) ? 0xFFFFFFF : 0;

		for(int i=0;i<n;i++)
		{
			cin >> a >> b >> co >> ti;
			money[a-1][b-1]=money[b-1][a-1]=co;
			time[a-1][b-1]=time[b-1][a-1]=ti;
		}
		/*ツδ渉ーツシツδδδ仰フツδ債イツドツ法 for time*/
		for(int k=1;k<m;k++)
			for(int i=0;i+k<m;i++)
				for(int j=0;j<m;j++)
					time[i][j]=time[j][i]=min(time[i][j],time[i][i+k]+time[i+k][j]);
					
		/*ツδ渉ーツシツδδδ仰フツδ債イツドツ法 for cost*/	
		for(int k=1;k<m;k++)
			for(int i=0;i+k<m;i++)
				for(int j=0;j<m;j++)
					money[i][j]=money[j][i]=min(money[i][j],money[i][i+k]+money[i+k][j]);
		cin >> p;
		
		for(int i=0;i<p;i++)
		{
			cin >> a >> b >> r;
			cout <<(r?time[a-1][b-1]:money[a-1][b-1])<< endl;
		}
	}
}

C++: #include<bits/stdc++.h>
using namespace std;

typedef long long int ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pair<int, int> > vii;
#define rrep(i, m, n) for(int (i)=(m); (i)<(n);  (i)++)
#define  rep(i, n)    for(int (i)=0; (i)<(n);  (i)++)
#define  rev(i, n)    for(int (i)=(n)-1; (i)>=0; (i)--)
#define vrep(i, c)    for(__typeof((c).begin())i=(c).begin(); i!=(c).end(); i++)
#define  ALL(v)       (v).begin(), (v).end()
#define mp            make_pair
#define pb            push_back
template<class T1, class T2> inline void minup(T1& m, T2 x){ if(m>x) m=static_cast<T2>(x); }
template<class T1, class T2> inline void maxup(T1& m, T2 x){ if(m<x) m=static_cast<T2>(x); }

#define INF 1000000000LL
#define MOD 1000000009
#define EPS 1E-9

const int MAX_V = 1000;
ll dp[2][MAX_V][MAX_V];
int E, V;
int a, b;
ll c, t;
int k;
int p, q, r;

int main()
{
  while((cin >> E >> V) && E && V){
    rep(i, V) rep(j, V) dp[0][i][j] = dp[1][i][j] = INF;

    rep(i, E){
      cin >> a >> b >> c >> t;
      a-=1;  b-=1;
      dp[0][a][b] = dp[0][b][a] = c;
      dp[1][a][b] = dp[0][b][a] = t;
    }

    rep(i, V) dp[0][i][i] = dp[1][i][i] = 0LL;
    rep(b, 2) rep(k, V) rep(i, V) rep(j, V) minup(dp[b][i][j], dp[b][i][k] + dp[b][k][j]);

    cin >> k;
    while(k--){
      cin >> p >> q >> r;
      cout << dp[r][p-1][q-1] << endl;
    }
  }

  return 0;
}