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<vector>
using namespace std;
class NextNodesData
{
public:	
	int nextNodesName;
	int nextNodesMany;
	int nextNodesTime;
};
class Nodes
{
public:
	vector<NextNodesData> nextNodes;
	int name;
	int minValue;
	bool fixed;
};

int main()
{
	int N, M;
	cin >> N >> M;
	vector<Nodes> nodesList;
	for(int i = 0; i < M; i++)
	{
		Nodes nodes;
		nodes.name = i+1;
		nodesList.push_back(nodes);
	}
	for(int i = 0; i < N; i++)
	{
		int Start;
		int End;
		int Many;
		int Time;
		cin >> Start >> End >> Many >> Time;

		NextNodesData nodes;
		nodes.nextNodesName = End;
		nodes.nextNodesMany = Many;
		nodes.nextNodesTime = Time;
		nodesList[Start - 1].nextNodes.push_back(nodes);
	}

	int Query;
	cin >> Query;

	for(int i = 0; i < Query; i++) 
	{
		
		
		for(int j = 0; j < nodesList.size(); j++)
		{
			nodesList[j].fixed = false;
		}
		int Start;
		int End;
		int mode;
		
		cin >> Start >> End;
		cin >> mode;

		if(Start == End)
		{
			cout << 0 << endl;
			continue;
		}

		nodesList[Start - 1].fixed = true;
		nodesList[Start - 1].minValue = 0;
		int nextFixedNodesName = Start;

		

		vector<Nodes> candidate;
		while(1)
		{
			for(int j = 0; j < nodesList[nextFixedNodesName - 1].nextNodes.size(); j++)
			{
				Nodes obj;
				obj.name = nodesList[nextFixedNodesName - 1].nextNodes[j].nextNodesName;
				if(nodesList[obj.name - 1].fixed == true)
				{
					continue;
				}
				if(mode == 0)
				{
					obj.minValue = nodesList[nextFixedNodesName - 1].minValue + nodesList[nextFixedNodesName - 1].nextNodes[j].nextNodesMany;
				}
				else
				{
					obj.minValue = nodesList[nextFixedNodesName - 1].minValue + nodesList[nextFixedNodesName - 1].nextNodes[j].nextNodesTime;
				}
				
				candidate.push_back(obj);				   
			}

			int minValue = 1001;
			int minName  = 1;
			for(int j = 0; j < candidate.size(); j++)
			{
				if(nodesList[candidate[j].name - 1].fixed == true)
				{
					continue;
				}

				if(candidate[j].minValue < minValue)
				{
					minValue = candidate[j].minValue;
					minName = candidate[j].name;
				}  
			}
			if(minName == End)
			{
				cout << minValue << endl;
				break;
			}
			nodesList[minName - 1].minValue = minValue;
			nodesList[minName - 1].fixed = true;
			nextFixedNodesName = minName;

			
			/*for(auto itr = candidate.begin(); itr != candidate.end();)
			{
				if(nodesList[itr->name - 1].fixed == true)
				{
					itr = candidate.erase(itr);
				}
				else
				{
					itr++;
				}
			}*/
		}	
		

	} 

	return 0;

}

C++: #include<iostream>
#include<algorithm>
#include<string>
#include<cstring>
#include<cstdio>
#include<cstdlib>
#include<vector>
#include<queue>
#include<stack>
#include<complex>
#include<utility>
#include<cmath>
#define loop(i,a,b) for(int i=a;i<b;i++)
#define rep(i,a) loop(i,0,a)
#define pi acos(-1)
#define all(v) v.begin(),v.end()
using namespace std;

const double eps = 1e-8;
const double INF = 1e5;

typedef pair<int,int> P;
typedef double Real;
typedef complex<Real> Point;
typedef vector<Point> G;

double cross(const Point& a,const Point& b){//calculate ad-bc(vector product)
	return imag(conj(a)*b);
}

struct L:public vector<Point>{//line data
	L(const Point &a,const Point &b){
		push_back(a);
		push_back(b);
	}
};

int main(){
	int n,m;
	while(1){
		cin>>n>>m;
		if(!n && !m)break;
		long long cost[m+1][m+1],ti[m+1][m+1];
		rep(i,m+1)rep(j,m+1)cost[i][j]=ti[i][j]=INF;
		int a,b,c,t;
		rep(i,n){
			cin>>a>>b;
			cin>>cost[a][b]>>ti[a][b];
			cost[b][a]=cost[a][b];
			ti[b][a]=ti[a][b];
		}
		loop(k,1,m+1){
			loop(i,1,m+1){
				loop(j,1,m+1){
					cost[i][j]=min(cost[i][j],cost[i][k]+cost[k][j]);
					ti[i][j]=min(ti[i][j],ti[i][k]+ti[k][j]);
				}
			}
		}
		int k,p,q,r;
		cin>>k;
		rep(i,k){
			cin>>p>>q>>r;
			if(r==0){
				cout<<cost[p][q]<<endl;
			}else{
				cout<<ti[p][q]<<endl;
			}
		}
	}
	return 0;
}

C++: #include <cstdio>
#include <vector>

using namespace std;

class Edge{
public:
	int from,to,cost,time;
	void Swap(){
		int self = from;
		from = to;
		to = from;
	}
	int GetValue(int r){
		if(r == 0){
			return cost;
		}else{
			return time;
		}
	}
};

vector<Edge> edge;
int n,m;

const int INF = 100000000;

int solve(const int p,const int q,const int r);

int main(){
	scanf("%d %d",&n,&m);
	for(int i=0;i<n;i++){
		Edge ed;
		scanf("%d %d %d %d",&ed.from,&ed.to,&ed.cost,&ed.time);
		edge.push_back(ed);
		ed.Swap();
		edge.push_back(ed);
	}
	int k;
	int p,q,r;
	scanf("%d",&k);
	for(int i=0;scanf("%d %d",&p,&q) && i < k;i++){
		if(p == 0 && q == 0){
			break;
		}
		scanf("%d",&r);
		printf("%d\n",solve(p,q,r));
	}
	return 0;
}

int solve(const int p,const int q,const int r){
	//vector<int> d(m+1);
	int *d = new int[m+1];
	for(int i=0;i<=m;i++){
		d[i] = INF;
	}
	d[p] = 0;
	
	bool flag;
	while(1){
		flag = false;
		vector<Edge>::iterator it;
		for(it = edge.begin();it != edge.end();it++){
			if(d[(*it).from] != INF && d[(*it).to] > d[(*it).from] + (*it).GetValue(r)){
				d[(*it).to] = d[(*it).from] + (*it).GetValue(r);
				flag = true;
			}
		}
		if(!flag){
			break;
		}
	}
	
	int ans = d[q];
	delete [] d;
	return ans;
}