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 <algorithm>
#include <climits>

#define INF INT_MAX / 2
#define REP(i, m, n) for(int i = m; i < static_cast<int>(n); ++i)
int main()
{
    int line_num, station_num;
    
    while (std::cin >> line_num >> station_num) {
        
        if (line_num == 0 && station_num == 0) break;

        int map[2][101][101];
        
        REP(i, 0, 2) REP(j, 0, 101) REP(k, 0, 101) map[i][j][k] = INF;
        
        REP(i, 0, line_num) {
            int a, b, cost, time;
            std::cin >> a >> b >> cost >> time;
            --a;
            --b;
            map[0][a][b] = map[0][b][a] = cost;
            map[1][a][b] = map[1][b][a] = time;
        }
        
        REP(l, 0, 2) {
            REP(i, 0, station_num) {
                REP(j, 0, station_num) {
                    REP(k, 0, station_num) {
                        map[l][i][j] = std::min(map[l][i][j], map[l][i][k] +
                                                map[l][k][j]);
                    }
                }
            }
        }

        int input_num;

        std::cin >> input_num;

        REP(i, 0, input_num) {
            int p, q, r;

            std::cin >> p >> q >> r;
            --p;
            --q;
            std::cout << map[r][p][q] << std::endl;
        }
    
    }
    return 0;
}

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

#define STAT_MAX 100
#define LINE_MAX 3000

int main(){
	
	int n;
	int p,q,r;

	int i,j;
	bool flg;

	int statNum;
	int stat[STAT_MAX];
	
	int lineNum;
	int lineTo[LINE_MAX][2];
	int lineCost[LINE_MAX][2];

	while(1){
		//???????????±
		cin>>lineNum>>statNum;if(!lineNum && !statNum) break;
		for(i=0;i<lineNum;i++){
			cin>>lineTo[i][0]>>lineTo[i][1]>>lineCost[i][0]>>lineCost[i][1];
			lineTo[i][0]--;lineTo[i][1]--;
		}

		//???????????????
		cin>>n;
		while(n--){
			cin>>p>>q>>r;
			p--;q--;
			for(i=0;i<statNum;i++) stat[i]=1000*STAT_MAX;
			stat[p]=0;

			do{
				flg=false;
				for(i=0;i<lineNum;i++){
					for(j=0;j<2;j++){
						if(stat[lineTo[i][1-j]]+lineCost[i][r]<stat[lineTo[i][j]]){
							stat[lineTo[i][j]]=stat[lineTo[i][1-j]]+lineCost[i][r];
							flg=true;
						}
					}
				}
			}while(flg);

			cout<<stat[q]<<endl;
		}
	}

	return 0;
}

C++: #include <iostream>
#include <iomanip>
#include <sstream>
#include <stdio.h>
#include <vector>
#include <stack>
#include <queue>
#include <algorithm>
#include <math.h>
#include <utility>
#include <string>
#include <ctype.h>
#include <cstring>
#include <cstdio>
#include <sstream>
#include <functional>

using namespace std;

#define FOR(i,k,n) for(int i = (k); i < (n); i++)
#define REP(i,n) FOR(i,0,n)
#define INF 114514810
#define ll long long
//#define scanf scanf_s

int cost[101][101];
int time_[101][101];


int main()
{
	int n, m;
	while (cin >> n >> m) 
	{
		if (!n&&!m) break;
		REP(i, 101)REP(j, 101)
		{
				cost[i][j] = INF;
				time_[i][j] = INF;
		}
		
		REP(i, n)
		{
			int a, b, c, t;
			cin >> a >> b >> c >> t;
			a--; b--;
			cost[a][b] = cost[b][a] = c;
			time_[a][b] = time_[b][a] = t;
		}

		REP(i, m)REP(j, m)REP(k, m)
		{
			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;
		REP(i, k)
		{
			int p, q, r;
			cin >> p >> q >> r;
			p--; q--;
			if (r == 0) cout << cost[p][q] << endl;
			else cout << time_[p][q] << endl;
		}
	}
	return 0;
}

C++: #include <sstream>
#include <string>
#include <vector>
#include <map>
#include <algorithm>
#include <iostream>
#include <utility>
#include <set>
#include <cctype>
#include <queue>
#include <stack>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <climits>
using namespace std;
#define INF 100000000
#define MAXM 128
typedef long long ll;

int dtime[MAXM][MAXM], dcost[MAXM][MAXM];
int n, m;

int main(void) {
    while (cin >> n >> m && n && m) {
        for (int i = 1; i <= m; i++) {
            for (int j = 1; j <= m; j++) {
                dtime[i][j] = INF;
                dcost[i][j] = INF;
            }
        }
        for (int i = 0; i < n; i++) {
            int a, b, cost, time;
            cin >> a >> b >> cost >> time;
            dtime[a][b] = dtime[b][a] = time;
            dcost[a][b] = dcost[b][a] = cost;
        }
        for (int k = 1; k <= m; k++) {
            for (int i = 1; i <= m; i++) {
                for (int j = 1; j <= m; j++) {
                    dtime[i][j] = min(dtime[i][j], dtime[i][k] + dtime[k][j]);
                    dcost[i][j] = min(dcost[i][j], dcost[i][k] + dcost[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 << dcost[p][q] << endl;
            } else {
                cout << dtime[p][q] << endl;
            }
        }
    }
    return 0;
}