Go: // Warshall–Floyd Algorithm

package main

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

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
					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>
using namespace std;

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

typedef pair<int,int> pii;
const int INF=1e6, MAXM=128;
int C[2][MAXM][MAXM], dist[MAXM], visited[MAXM], N, M;

int main()
{
        int a,b,c,d;
        cin>>N>>M;
        rep(i,M) rep(j,N) C[0][i][j]=C[1][i][j]=INF;
        rep(i,N){ cin>>a>>b>>c>>d; --a; --b; C[0][a][b]=C[0][b][a]=c; C[1][a][b]=C[1][b][a]=d; }

        cin>>d;
        rep(i,d)
        {
                fill(dist,dist+MAXM,INF);
                fill(visited,visited+MAXM,false);

                cin>>a>>b>>c; --a; --b;
                dist[a]=0;

                while(true)
                {
                        int from=-1;
                        rep(i,M) if(!visited[i]&&(from==-1||dist[i]<dist[from])){ from=i; }
                        if(from==b){ cout<<dist[from]<<endl; break; } else { visited[from]=true; }

                        rep(to,M) dist[to]=min(dist[to],dist[from]+C[c][from][to]);
                }
        }

        return 0;
}

C++: #include <iostream>
using namespace std;
#define INF 1000000
int time[110][110];
int cost[110][110];
int main()
{
    int n,m;
    while(cin>>n>>m,n){
        for(int i=0;i<m;++i){
            for(int j=0;j<m;++j){
                int a;
                i==j?a=0:a=INF;
                time[i][j]=a;
                cost[i][j]=a;
            }
        }
        for(int i=0;i<n;++i){
            int a,b,c,t;
            cin>>a>>b>>c>>t;
            a--;b--;
            cost[a][b]=c;
            cost[b][a]=c;
            time[a][b]=t;
            time[b][a]=t;
        }
        for(int k=0;k<m;++k){
            for(int i=0;i<m;++i){
                for(int j=0;j<m;++j){
                    cost[i][j]=min(cost[i][j],cost[i][k]+cost[k][j]);
                    time[i][j]=min(time[i][j],time[i][k]+time[k][j]);
                }
            }
        }
        int k;
        cin>>k;
        for(int i=0;i<k;++i){
            int p,q,r;
            cin>>p>>q>>r;
            p--;q--;
            if(!r)
                cout<<cost[p][q]<<endl;
            else
                cout<<time[p][q]<<endl;
        }
    }
    return 0;
}

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

struct edge{
	int money;
	int time;
};

int main(){
	int n, m;
	int count;
	edge G[100][100];

	while(cin >> n >> m, n || m){
		for(int i=0; i < 100; i++){
			for(int j=0; j < 100; j++){
				G[i][j].money = 100000;
				G[i][j].time = 100000;
			}
		}

		for(int i=0; i < n; i++){
			int a, b, mo, t;
			cin >> a >> b >> mo >> t;

			G[a][b].time=t;
			G[a][b].money=mo;
			G[b][a].time=t;
			G[b][a].money=mo;
		}

		for(int k=0; k < n; k++){
			for(int i=0; i < n; i++){
				for(int j=0; j < n; j++){
					G[i][j].time = min(G[i][j].time, G[i][k].time+G[k][j].time);
					G[i][j].money = min(G[i][j].money, G[i][k].money+G[k][j].money);
				}
			}
		}

		cin >> count;
		for(int i=0; i < count; i++){
			int p;
			cin >> n >> m >> p;

			if(p==1) cout << G[n][m].time << endl;
			else cout << G[n][m].money << endl;
		}
	}
	return 0;
}

C++: #include<stdio.h>
#include<string.h>
#define MAX 101
#define INT_MAX 1001
#define min(a,b) (a>b?b:a)
int N;
int M[2][MAX][MAX];

void dijkstra( int s, int q,int flag){
    char visited[MAX]; // S É®·ém[hÍ true
	int d[MAX];
	int i;
    for (i = 1; i <= N; i++ ){
        d[i] = INT_MAX;
        visited[i] = 0;
    }
    
    d[s] = 0; // ÅÉ s ª u ÆµÄIÎêé
    
    while( 1 ){
        int u; // ÅKÈm[h u ðIÔ
        int mincost = INT_MAX;
        for ( i = 1; i <= N; i++ ){
            if ( !visited[i] && d[i] < mincost ){
                mincost = d[i]; u = i;
            }
        }
        
        // u ª¶ÝµÈ©Á½Æ«AÂÜè S ª±êÈã¦È¢Æ«AI¹
        if ( mincost == INT_MAX ) break;
        
        visited[u] = 1; // u ð S ÉÇÁ
        int v;
        for (  v = 1; v <= N; v++ ){
            // v ª S ÉÜÜêéê@Ü½Í@GbW(u, v)ªÈ¢êÍ@³
            if ( visited[v] || M[flag][u][v] == INT_MAX ) continue;
            
            d[v] = ( d[v]> d[u] + M[flag][u][v]?d[u]+M[flag][u][v]:d[v] );
        }
    }
	printf("%d\n",d[q]);
}

int main(){
	int m,i,j,a,b,c,t,k,p,q,r;
	
	while(~scanf("%d%d",&m,&N)){
		if(N==0 && m==0)break;
		
		for(i=1;i<=N;i++){
			for(j=0;j<N;j++){
				M[0][i][j]=INT_MAX;
				M[1][i][j]=INT_MAX;
			}
		}
		
		for(i=0;i<m;i++){
			scanf("%d%d%d%d",&a,&b,&c,&t);
			M[0][a][b]=c;
			M[0][b][a]=c;
			M[1][a][b]=t;
			M[1][b][a]=t;
		}
		scanf("%d",&k);
		for(i=0;i<k;i++){
			scanf("%d%d%d",&p,&q,&r);
			dijkstra(q,p,r);
		}
	}
	return 0;
}