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<algorithm>
#include<queue>
#include<cstring>
using namespace std;

int cost[101][101];
int gtime[101][101];

struct tSta{
	int val, sta, psta;
	tSta( int s ){
		val = 0;
		sta = s;
		psta = 0;
	}
};

bool operator<( const tSta& l, const tSta& r ){
	return l.val > r.val;
}

int main(){
	priority_queue<tSta> que;
	int n, m, k;
	while( cin >> n >> m, n||m ){
		memset( cost, 0, sizeof(cost) );
		memset( gtime, 0, sizeof(gtime) );
		for( int i=0; i<n; i++ ){
			int a, b, c, t;
			cin >> a >> b >> c >> t;
			cost[a][b] = cost[b][a] = c;
			gtime[a][b] = gtime[b][a] = t;
		}
		cin >> k;
		for( int i=0; i<k; i++ ){
			int p, q, r;
			cin >> p >> q >> r;
			while( !que.empty() )	que.pop();
			que.push( tSta(p) );
			while( !que.empty() ){
				tSta ts = que.top();
				if( ts.sta == q )	break;
				que.pop();
				if( r==0 ){	// cost
					for( int j=1; j<=m; j++ ){
						if( cost[ts.sta][j] > 0 && ts.psta != j ){
							tSta next(j);
							next.val = ts.val + cost[ts.sta][j];
							next.psta = ts.sta;
							que.push( next );
						}
					}
				}else if( r==1 ){	// time
					for( int j=1; j<=m; j++ ){
						if( gtime[ts.sta][j] > 0 && ts.psta != j ){
							tSta next(j);
							next.sta = j;
							next.val = ts.val + gtime[ts.sta][j];
							next.psta = ts.sta;
							que.push( next );
						}
					}
				}
			}
			cout << que.top().val << endl;
		}
	}
	return 0;
}

C++: #include <iostream>

#define INFINITY (1001)

using namespace std;

int main(void)
{
	int time[300][300];
	int cost[300][300];
	int n, m;
	
	while (1){
	cin >> n >> m;
	if (n == 0 && m == 0) break;
	for (int i = 0; i < m; i++){
		for (int j = 0; j < m; j++){
			time[i][j] = cost[i][j] = INFINITY;
		}
	}
	for (int i = 0; i < n; i++){
		int a, b, t, c;
		cin >> a >> b >> c >> t;
		time[a - 1][b - 1] = time[b - 1][a - 1] = t;
		cost[a - 1][b - 1] = cost[b - 1][a - 1] = c;
	}
	
	for (int i = 0; i < m; i++){
		for (int j = 0; j < m; j++){
			cout << cost[i][j] << ' ';
		}
		cout << endl;
	}
	
	for (int k = 0; k < m; k++){
		for (int i = 0; i < m; i++){
			for (int j = 0; j < m; j++){
				time[i][j] = min(time[i][j], time[i][k] + time[k][j]);
				cost[i][j] = min(cost[i][j], cost[i][k] + cost[k][j]);
			}
		}
	}
	
	for (int i = 0; i < m; i++){
		for (int j = 0; j < m; j++){
			cout << cost[i][j] << ' ';
		}
		cout << endl;
	}
	
	int req_count;
	cin >> req_count;
	for (int i = 0; i < req_count; i++){
		int a, b, f;
		cin >> a >> b >> f;
		if (f == 0){
			cout << cost[a - 1][b - 1] << endl;
		}
		else {
			cout << time[a - 1][b - 1] << endl;
		}
	}
	}
	return (0);
}

C++: #include <iostream>
#include <string>
#include <sstream>
#include <vector>
#include <iterator>
#include <cstdlib>
using namespace std;

typedef vector<int> vint;

vint input(int sz){
	string s;
	getline(cin, s);
	stringstream ss1(s), ss2;
	istream_iterator<int> b(ss1), e;
	vint v(b, e);
	if(cin.eof() || v.size() != sz){ throw ""; }
	for(int i = 0; i < sz; ++i){
		if(i){ ss2 << ' '; }
		ss2 << v[i];
	}
	string t = ss2.str();
	if(s != t){ throw 0; }
	return v;
}

int main(){
	while(1){
		vint v = input(2);
		if(!v[0] && !v[1]){ break; }
		int n = v[0];
		for(int i = 0; i < n; ++i){
			input(4);
		}
		int k = input(1)[0];
		for(int i = 0; i < k; ++i){
			input(3);
		}
	}
	cin.peek();
	if(!cin.eof()){
		exit(EXIT_FAILURE);
	}
}

C++: #include<iostream>
using namespace std;
#define INFTY (1<<21)
#define MAX 100
void floyd(int m, int C[MAX][MAX], int T[MAX][MAX]){
for(int k = 0;k<m;k++)
for(int i = 0;i<m;i++)
for(int j = 0;j<m;j++){
C[i][j] = min( C[i][j], C[i][k] + C[k][j] );
T[i][j] = min( T[i][j], T[i][k] + T[k][j] );
}
}
main(){
int n, m, a, b, c, t, k, q, C[MAX][MAX], T[MAX][MAX];
while( cin >> n >> m && !(n == 0 && m == 0) ){
for(int i = 0;i<m;i++)
for(int j = 0;j<m;j++) { C[i][j] = T[i][j] = INFTY; }
for(int i = 0;i<n;i++){
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;
}
floyd(m, C, T);
cin >> k;
for(int i = 0;i<k;i++){
cin >> a >> b >> q;
if ( q ) cout << T[a-1][b-1] << endl;
else cout << C[a-1][b-1] << endl;
}
}
}

C++: 6 5
1 2 200 10
1 4 400 15
1 3 250 25
2 4 100 10
4 5 150 20
3 5 300 20
2
1 5 0
1 5 1
0 0

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

const int INF = 2000;

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;
}