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>
#define INF 100000000
using namespace std;
int min(int a,int b){
  if(a<b) return a;
  else return b;
}
int main(){
  int n,m;
  while(cin>>n>>m){
    if(n==0&&m==0) break;
    int d0[m+1][m+1],d1[m+1][m+1];
    for(int i=1;i<=m;i++){
      for(int j=1;j<=m;j++){
	d0[i][j] = INF;
	d1[i][j] = INF;
      }
    }
    int a,b,cost,time;
    for(int i=0;i<n;i++){
      cin >> a >> b >> cost >> time;
      d0[a][b] = cost;
      d0[b][a] = cost;
      d1[a][b] = time;
      d1[b][a] = time;
    }
    for(int i=1;i<=m;i++){
      for(int j=1;j<=m;j++){
	for(int k=1;k<=m;k++){
	  d0[i][j] = min(d0[i][j],d0[i][k]+d0[k][j]);
	  d1[i][j] = min(d1[i][j],d1[i][k]+d1[k][j]);
	}
      }
    }
    int s,p,q,r; 
    cin >> s;
    for(int i=0;i<s;i++){
      cin >> p >> q >> r;
      if(r==0) cout << d0[p][q] << endl;
      else cout << d1[p][q] << endl;
    }
  }
  return 0;
}

C++: #include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cstring>
using namespace std;

#define REP(i,k,n) for(int i=k;i<n;++i)
#define rep(i,n) REP(i,0,n)

int N,M,K;
const int MAXN=128;
const int INF=1e9;
int G1[MAXN][MAXN];
int G2[MAXN][MAXN];

int main()
{
	while(cin>>M>>N&&(M||N))
	{
		//fill((int*)G1,(int*)&G1[MAXN][MAXN],INF);
		//fill((int*)G2,(int*)&G2[MAXN][MAXN],INF);
		rep(i,N){ rep(j,N){ G1[i][j]=G2[i][j]=(i==j?0:INF); } }

		rep(i,M)
		{ 
			int a,b,c,d;
			cin>>a>>b>>c>>d; --a; --b;
			G1[a][b]=G1[b][a]=c;
			G2[a][b]=G2[b][a]=d;
		}

		rep(from,N) rep(to,N) rep(point,N)
		{
			G1[from][to] = min(G1[from][to],G1[from][point]+G1[point][to]);
			G2[from][to] = min(G2[from][to],G2[from][point]+G2[point][to]);
		}

		cin>>K;
		rep(i,K)
		{
			int a,b,c; cin>>a>>b>>c; --a; --b;
			cout<<(c?G2[a][b]:G1[a][b])<<endl;
		}
	}

	return 0;
}

C++: #include<iostream>
#include<string.h>
using namespace std;
#define WHITE 0
#define GLAY 1
#define BLACK 2
#define INF 9999
int kingaku(void);
int saitan(void);
int n,m,p,q;
int cost[101][101],timev[101][101];
int main()
{
	int a,b,c,t,k,r;
	while(1){
		memset(cost,INF,sizeof(cost));
		memset(timev,INF,sizeof(timev));
		cin >> n >> m;
		if(n==0 && m==0) break;
		for(int i=0;i<n;i++){
			cin >> a >> b >> c >> t;
			cost[a][b] = cost[b][a] = c;
			timev[a][b] = timev[b][a] = t;
		}
		cin >> k;
		for(int i=0;i<k;i++){
			cin >> p >> q >> r;
			if(r==0){
				cout << kingaku() << endl;
			}
			else if(r==1)
				cout << saitan() << endl;
		}
	}
	return 0;
}

int kingaku()
{
	int minv;
	int dd[101],color[101];

	for(int i=0;i<=n;i++){
		dd[i] = INF;
		color[i] = WHITE;
	}
	dd[p] = 0;
	color[p] = GLAY;
	while(1){
		minv = INF;
		int u = -1;
		for(int i=1;i<=m;i++){
			if(minv > dd[i] && color[i] != BLACK ){
				u = i;
				minv = dd[i];
			}
		}
		if(u == -1) break;
		color[u] = BLACK;
		for(int v=1;v<=m ;v++){
			if(color[v] != BLACK && cost[u][v] != INF){
				if(dd[v] > dd[u] + cost[u][v]){	
					dd[v] = dd[u] + cost[u][v];
				}
			}
		}
	}
	//for(int i=0;i<n;i++) cout << dd[i] << endl;
	return dd[q];
}

int saitan()
{
	int minv;
	int dd[101],color[101];

	for(int i=0;i<=n;i++){
		dd[i] = INF;
		color[i] = WHITE;
	}
	dd[p] = 0;
	color[p] = GLAY;
	while(1){
		minv = INF;
		int u = -1;
		for(int i=1;i<=m;i++){
			if(minv > dd[i] && color[i] != BLACK ){
				u = i;
				minv = dd[i];
			}
		}
		if(u == -1) break;
		color[u] = BLACK;
		for(int v=1;v<=m;v++){
			if(color[v] != BLACK && timev[u][v] != INF){
				if(dd[v] > dd[u] + timev[u][v]){	//d[v]:??????
					dd[v] = dd[u] + timev[u][v];
				}
			}
		}
	}
	//for(int i=0;i<n;i++) cout << dd[i] << endl;
	return dd[q];
}

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];
	bool use[MAX_M];
	for(int i=0;i<MAX_M;i++){
		d[i]=INT_MAX;
		use[i]=0;
	}
	priority_queue<P,vector<P>,greater< P > > que;
	
	d[s]=0;
	
	que.push(P(0,s));
	int ans;
	while(!que.empty()){
		P p=que.top();que.pop();
		int v=p.second;
		if(v==e){
			ans=p.first;
			break;
		}
		
		if(use[v]) continue;
		use[v]=1;
		for(int i=0;i<c[r][v].size();i++){
			edge e=c[r][v][i];
			if(!use[e.to]){
				d[e.to]=d[v]+e.cost;
				que.push(P(d[e.to],e.to));
			}
		}
	}
	
	return ans;
}

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].clear();
			}
		}
		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);
			co.to=a;t.to=a;
			c[0][b].push_back(co);
			c[1][b].push_back(t);
		}
		int k;
		cin>>k;
		for(int i=0;i<k;i++){
			int s,e;
			bool r;
			cin>>s>>e>>r;
			int ans=dijkstra(s,e,r);
			cout<<ans<<endl;
		}
	}
}