Go: // Warshall–Floyd Algorithm

package main

import (
	"bufio"
	"os"
	"strings"
	"strconv"
	"fmt"
)

var scanner = bufio.NewScanner(os.Stdin)

const INF = 0x7FFFFFFF

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
				} else {
					c_dist[i][j] = c_matrix[i][j]
				}
				if c_matrix[i][j] == 0{
					c_prev[i][j] = -1
				} else {
					c_prev[i][j] = i
				}
				if t_matrix[i][j] == 0{
					t_dist[i][j] = INF
				} else {
					t_dist[i][j] = t_matrix[i][j]
				}
				if t_matrix[i][j] == 0{
					t_prev[i][j] = -1
				} else {
					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>
#include <vector>
#include <algorithm>
#include <set>
#include <climits> 
#include <map>
using namespace std;

const int MAX_V = 1000; 
const int INF = 100000; 
int v; 
int g[MAX_V][MAX_V]; 
int g2[MAX_V][MAX_V];
int d[MAX_V]; 
bool used[MAX_V]; 

void dijkstra(int s)
{
  fill(d, d + v, INF);
  fill(used, used + v, false);

  

  d[s] = 0;
  for(;;){
    
    int i = -1;
    for(int j = 0; j < v; ++j)
      if(!used[j] && (i == -1 || d[i] > d[j]))
	i = j;
    if(i == -1)break; 
    used[i] = true;
    for(int j = 0; j < v; ++j)
      d[j] = min(d[j], d[i] + g[i][j]);
  }
}

void dijkstra2(int s)
{
  fill(d, d + v, INF);
  fill(used, used + v, false);
  d[s] = 0;
  for(;;){
    int i = -1;
    for(int j = 0; j < v; ++j)
      if(!used[j] && (i == -1 || d[i] > d[j]))
	i = j;
    if(i == -1)break; 
    used[i] = true;
    for(int j = 0; j < v; ++j)
      d[j] = min(d[j], d[i] + g2[i][j]);
  }
}


int main()
{
  for(;;){
    int gv, ge;
    cin >> ge >> gv;
    if(ge==0){return 0;}

    fill(&g[0][0], &g[MAX_V][0], 100000);
    fill(&g2[0][0], &g2[MAX_V][0], 100000);


    for(int i = 0; i < ge; ++i){
      int gs, gt, gd,gd2;
      cin >> gs >> gt >> gd >> gd2;
      g[gs-1][gt-1]=gd;
      g[gt-1][gs-1]=gd;
      g2[gs-1][gt-1]=gd2;
      g2[gs-1][gt-1]=gd2;
    }
    v = gv;

    //for(int i=0;i<v;i++){for(int j=0;j<v;j++){cout << g[i][j] << " ";}cout << endl;}
    
    int k;
    cin >> k;
    for(int i=0;i<k;i++){
      int p,q,r;
      cin >> p >> q >> r;
      if(r==0){
	dijkstra(p-1);
	//for(int j=1;j<=gv;j++)
	  cout << d[q-1] << endl;
      }else{
	dijkstra2(p-1);
	//for(int j=0;j<=gv;j++)
	  cout << d[q-1] << endl;
      }
    }
  }
  return 0;
}

C++: #include<iostream>
#include<algorithm>
using namespace std;
int main(){
  int n,m;
  while(cin >>n>>m,n||m){
    int c_t[100][100][2],ans[100][100][2];
    for(int i=0; i<100; i++){
      for(int j=0; j<100; j++){
	for(int k=0; k<2; k++){
	  ans[i][j][k] = 100000000;
	  if(i==j) ans[i][j][k] = 0;
	}
      }
    }
    for(int i=0,a,b,c,d; i<n; i++){
      cin >>a>>b>>c>>d;
      a--;b--;
      ans[a][b][0] = ans[b][a][0] = c;
      ans[a][b][1] = ans[a][b][1] = d;
    }
    for(int k=0; k<2; k++){
      for(int i=0; i<m; i++){
	for(int j=0; j<m; j++){
	  for(int l=0; l<m; l++){
	    ans[i][j][k] = min(ans[i][j][k],ans[i][l][k]+ans[l][j][k]);
	  }
	}
      }
    }
    int t=0;
    cin >>t;
    while(t--){
      int p,q,r;
      cin >>p>>q>>r;
      cout <<ans[p-1][q-1][r]<<endl;
    }
  }
  return 0;
}

C++: #define _CRT_SECURE_NO_WARNINGS

#include<fstream>
#include<iostream>
#include<string>
#include<iomanip>
#include<list>
#include<math.h>
#include<stack>
#include<queue>
#include<vector>
#include<algorithm>
#include<utility>

using namespace std;

short cost[110][110];
short time_data[110][110];


int main(){
	short n, m;


	while (cin >> n >> m && (n != 0 && m != 0)) {
		short min_ = 2000; // 答えの最小値
		short min_num = 1; // 答えの町

		short from, to, time_, cost_;
		short k;
		short k_from, k_to, info;

		for (short i = 0; i < 110; i++) {
			for (short j = 0; j < 110; j++) {
				cost[i][j] = 2000;
				time_data[i][j] = 2000;
			}
		}
		for (short i = 0; i < 3000; i++) {
			cost[i][i] = 0;
		}
		for (short i = 0; i < n; i++) {
			cin >> from >> to >> cost_ >> time_;
			cost[from][to] = cost_;
			cost[to][from] = cost_;
			time_data[from][to] = time_;
			time_data[to][from] = time_;
		}
		for (short k = 1; k <= m; k++) {
			for (short i = 1; i <= m; i++) {
				for (short j = 1; j <= m; j++) {
					cost[i][j] = min((int)cost[i][j], cost[i][k] + cost[k][j]);

					time_data[i][j] = min((int)time_data[i][j], time_data[i][k] + time_data[k][j]);
				}
			}
		}
		// 答えを求める
		cin >> k;
		for (short i = 0; i < k; i++) {
			cin >> k_from >> k_to >> info;
			if (info == 0) {
				cout << cost[k_from][k_to] << endl;
			} else {
				cout << time_data[k_from][k_to] << endl;
			}
		}
		
  }
	return 0;
}

C++: #include <iostream>
const int MAX_E = 300, MAX_V = 100, INF = 1000000;
struct edge{int from, to, time, cost;};

edge es[MAX_E+1];
int d[MAX_V+1];
int n, m, k;

//0: time 1: cost
int minimum_value(int type, int start, int end){
	for(int i=1;i<=m;i++)d[i] = INF;
	d[start] = 0;

	int res = 0;
	while(true){
		bool update = false;
		for(int i=0;i<n;i++){
			edge e = es[i];
			int cost = type?e.cost:e.time;
			if(d[e.from] != INF && d[e.to] > d[e.from] + cost){
				d[e.to] = d[e.from] + cost;
				res = d[e.to];
				update = true;
			}		
		}
		if(!update)break;
	}

	return res;
}

int main(){
	while(std::cin >> n >> m, n){
		for(int i=0;i<n;i++){
			int from, to, time, cost;
			std::cin >> from >> to >> time >> cost;
			edge e;
			e.from = from, e.to = to, e.time = time, e.cost = cost;
			es[i] = e;
		}

		std::cin >> k;
		for(int j=0;j<k;j++){
			int start, end, type;
			std::cin >> start >> end >> type;
			std::cout << minimum_value(type, start, end) << std::endl;
		}
	}

	return 0;
}