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<queue>
#include<algorithm>
#include<utility>
#include<vector>
#include<climits>
using namespace std;

#define MAX_M 110

struct edge{int to,cost;};
typedef pair<int,int> P;

vector<edge> c[2][MAX_M];

int dijkstra(int s,int e,bool r){
	int d[MAX_M];
	for(int i=0;i<MAX_M;i++){
		d[i]=INT_MAX;
	}
	priority_queue<P,vector<P>,greater< P > > que;
	
	d[s]=0;
	
	que.push(P(0,s));
	
	while(!que.empty()){
		P p=que.top();que.pop();
		int v=p.second;
		if(d[v]<p.first) continue;
		for(int i=0;i<c[r][v].size();i++){
			edge e=c[r][v][i];
			if(d[e.to]>d[v]+e.cost){
				d[e.to]=d[v]+e.cost;
				que.push(P(d[e.to],e.to));
			}
		}
	}
	
	return d[e];
}

int main(){
	int n,m;
	while(cin>>n>>m,n!=0||m!=0){
		for(int r=0;r<2;r++){
			for(int i=0;i<MAX_M;i++){
				c[r][i].resize(0);
			}
		}
		for(int i=0;i<n;i++){
			int a,b,cos,tim;
			cin>>a>>b>>cos>>tim;
			edge co,t;
			co.to=b;co.cost=cos;
			t.to=b;t.cost=tim;
			c[0][a].push_back(co);
			c[1][a].push_back(t);
		}
		cin>>n;
		for(int i=0;i<n;i++){
			int s,e;
			bool r;
			cin>>s>>e>>r;
			int ans=dijkstra(s,e,r);
			cout<<ans<<endl;
		}
	}
}

C++: #include <cstdio>
#include <vector>
#include <queue>
#include <algorithm>
using namespace std;
typedef pair<int,int> P;
#define mp make_pair
#define pb push_back
#define INF 2100000000
struct se1{
	int to,cost;
	se1(int a,int c):to(a),cost(c){}
};
struct se2{
	int to,time;
	se2(int a,int c):to(a),time(c){}
};
int d[105];
int V;
vector<se1>G[105];
vector<se2>GG[105];
void dijkstra1(int s){
	priority_queue<P,vector<P>,greater<P> > pque;
	fill(d,d+(V+1),INF);
	d[s]=0;
	pque.push(mp(0,s));
	while(!pque.empty()){
		P p=pque.top(); pque.pop();
		int v=p.second;
		if(d[v]<p.first) continue;
		for(int i=0;i<G[v].size();i++){
			se1 q=G[v][i];
			if(d[q.to]>d[v]+q.cost){
				d[q.to]=d[v]+q.cost;
				pque.push(mp(d[q.to],q.to));
			}
		}
	}
}
void dijkstra2(int s){
	priority_queue<P,vector<P>,greater<P> > pque;
	fill(d,d+(V+1),INF);
	d[s]=0;
	pque.push(mp(0,s));
	while(!pque.empty()){
		P p=pque.top(); pque.pop();
		int v=p.second;
		if(d[v]<p.first) continue;
		for(int i=0;i<GG[v].size();i++){
			se2 q=GG[v][i];
			if(d[q.to]>d[v]+q.time){
				d[q.to]=d[v]+q.time;
				pque.push(mp(d[q.to],q.to));
			}
		}
	}
}
int n;
int main(){
	while(1){
		for(int i=0;i<105;i++){
			G[i].clear();
			GG[i].clear();
		}
	scanf("%d %d",&n,&V);
	if(!n) break;
	for(int i=0;i<n;i++){
		int ax,ay,bx,by;
		scanf("%d %d %d %d",&ax,&ay,&bx,&by);
		G[ax].pb(se1(ay,bx));
		G[ay].pb(se1(ax,bx));
		GG[ax].pb(se2(ay,by));
		GG[ay].pb(se2(ax,by));
	}
	int Q;
	scanf("%d",&Q);
	for(int i=0;i<Q;i++){
		int rp,er,ep;
		scanf("%d %d %d",&rp,&er,&ep);
		if(ep==0){
			dijkstra1(rp);
			printf("%d\n",d[er]);
		}else{
			dijkstra2(rp);
			printf("%d\n",d[er]);
		}
	}
}
}

C++: #include<iostream>
using namespace std;
#define rep(i,a) for(int i=0;i<a;i++)
int main(void){
  int maze[2][100][100];
  int n,m;
  int a,b,c,t;
  while(cin>>m>>n,n+m){
    rep(i,n)rep(j,n)rep(k,2)maze[k][i][j]=100000;
    rep(i,m){
      cin>>a>>b>>c>>t;
      maze[0][--a][--b]=c;
      maze[1][a][b]=t;
      maze[0][b][a]=c;
      maze[1][b][a]=t;
    }
    rep(k,n)rep(i,n)rep(j,n)rep(l,2)
      maze[l][i][j]=min(maze[l][i][j],maze[l][i][k]+maze[l][k][j]);
    cin>>m;
    //cout<<endl;rep(i,n)rep(j,n)cout<<maze[1][i][j]<<(j==n-1?'\n':' ');
    
    rep(i,m){
      cin>>a>>b>>c;
      cout<<maze[c][--a][--b]<<endl;
    }
  }
}

C++: #include <iostream>
#include <cstdio>
#include <algorithm>
#include <vector>
#include <sstream>
#include <cmath>
#include <queue>

#define INF (1 << 28)

using namespace std;

int cost[200][200], dist[200][200];

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