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
			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>
#include <algorithm>
using namespace std;

const int INF = 1 << 25;
int cost[100][100], time[100][100];

int main() {
	int n, m, query;

	while (cin >> n >> m , n) {
		for (int i = 0; i < m; i++) {
			for (int j = 0; j < m; j++) {
				cost[i][j] = (i == j) ? 0 : INF;
				time[i][j] = (i == j) ? 0 : INF;
			}
		}

		while (n--) {
			int a, b, c, t;
			cin >> a >> b >> c >> t;
			cost[a - 1][b - 1] = cost[b - 1][a - 1] = c;
			time[a - 1][b - 1] = time[b - 1][a - 1] = 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]);
				}
			}
		}

		cin >> query;
		while (query--) {
			int p, q, r;
			cin >> p >> q >> r;
			if (r == 0) {
				cout << cost[p - 1][q - 1] << endl;
			}
			else {
				cout << time[p - 1][q - 1] << endl;
			}
		}
	}
}

C++: // http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=0200

/* http://www.deqnotes.net/acmicpc/dijkstra/
9 6
1 2 5 0
1 3 4 0
1 4 2 0
2 3 2 0
3 4 3 0
2 6 6 0
3 5 2 0
5 6 4 0
4 5 6 0
1
1 6 0
0 0

*/

#include <cstdio>
#include <climits>
#include <cstring>

#define STATION_MAX 101

//#define dprintf(arg1, ... ) printf( arg1, __VA_ARGS__)
#define dprintf(arg1, ... ) 

/*
typedef struct {
	
} LINE;
*/


int main(void) {

	while(1) {
		int line_cnt, stat_cnt;
		scanf("%d %d\n", &line_cnt, &stat_cnt);
		if ( line_cnt==0 && stat_cnt== 0 ) { break; }
		
		int line_cost[2][STATION_MAX][STATION_MAX];
		memset( line_cost, -1, sizeof(int)*2*STATION_MAX*STATION_MAX );
		
		int a; int b; int fee; int time;
		for( int i=0; i<line_cnt; i++ ) {
			scanf("%d %d %d %d\n", &a, &b, &fee, &time );
			line_cost[0][a][b] = line_cost[0][b][a] = fee;
			line_cost[1][a][b] = line_cost[1][b][a] = time;
		}
		
		int query_cnt;
		scanf("%d\n", &query_cnt );
		
		for( int i=0; i<query_cnt; i++ ) {
			int start, end, type;
			
			scanf("%d %d %d\n", &start, &end, &type );
			
			int stat_cost[STATION_MAX];
			bool stat_flag[STATION_MAX];
			memset( stat_cost, -1, sizeof(int)*STATION_MAX );
			memset( stat_flag, false, sizeof(bool)*STATION_MAX );
			
			stat_cost[start] = 0;
			
			while(1) {
				int minstat = -1;
				int minval=INT_MAX;
				for ( int i=1; i<stat_cnt+1; i++ ) {
					if ( stat_cost[i] == -1 ) { continue; }
					if ( stat_flag[i] == true ) { continue; }
					if ( stat_cost[i] < minval ) { minstat = i; minval = stat_cost[i]; }
				}
				if ( minstat == -1 ) { break; }
				dprintf("minstat: %d stat_cost=%d\n", minstat, stat_cost[minstat]);
				
				stat_flag[minstat] = true;
				
				//check_tonari
				for ( int i=1; i<stat_cnt+1; i++ ) {
				if ( lcost[nowstat][i] == -1 ) { continue; }
					if ( stat_cost[i] == -1 ||  stat_cost[i] > stat_cost[nowstat] + lcost[nowstat][i] ) {
						dprintf( "Refresh stat_cost[%d]:  %d (old: %d)\n", i, stat_cost[nowstat] + lcost[nowstat][i], stat_cost[i]);
						stat_cost[i] = stat_cost[nowstat] + lcost[nowstat][i];
					}
				}
			}
			
			printf("%d\n", stat_cost[end]);
		}
	}
	
	return 0;
}

C++: #include<iostream>
#include<string.h>
using namespace std;
int kingaku(void);
int saitan(void);
#define WHITE 0
#define GLAY 1
#define BLACK 2
#define INF 9999
int n;	//	??????????????±?????°
int m;	//	?§??????°
int p;	//	????????°
int q;	//	??°?????°
int minv;
int cost[101][101];
int time[101][101];
int dd[101];
int main()
{
	int a,b,c,t,k,r;
	while(1){
		memset(cost,INF,sizeof(cost));
		memset(time,INF,sizeof(time));
		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;
		time[a][b] = time[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;
			//for(int i=1;i<=m;i++)
			//	cout << i << " " << dd[i] << endl;
		}
	}
	return 0;
}

int kingaku()
{
	int u;
	int color[101];
	memset(dd,INF,sizeof(dd));
	memset(color,WHITE,sizeof(color));
	dd[p] = 0;
	color[p] = GLAY;
	while(1){
		u = -1;
		minv = INF;
		for(int i=1;i<=m;i++){
			if(minv > dd[i] && color[i] != BLACK){
				minv = dd[i];
				u = i;
			}
		}
		if(u==-1) break;
		color[u] = BLACK;
		for(int i=1;i<=m;i++){
			if(cost[u][i] != INF && color[i] != BLACK){
				if(dd[i] > dd[u] + cost[u][i])	//
					     //1?§?     1?§???¨??\?????????????§?
					dd[i] = dd[u] + cost[u][i];
			}
		}
	}
	return dd[q];
}

int saitan()
{
	int u;
	int color[101];
	memset(dd,INF,sizeof(dd));
	memset(color,WHITE,sizeof(color));
	dd[p] = 0;
	color[p] = GLAY;
	while(1){
		u = -1;
		minv = INF;
		for(int i=1;i<=m;i++){
			if(minv > dd[i] && color[i] != BLACK){
				minv = dd[i];
				u = i;
			}
		}
		if(u==-1) break;
		color[u] = BLACK;
		for(int i=1;i<=m;i++){
			if(time[u][i] != INF && color[i] != BLACK){
				if(dd[i] > dd[u] + time[u][i])
					dd[i] = dd[u] + time[u][i];
			}
		}
	}
	return dd[q];
}