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

#define STATION_MAX 101

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

/*
typedef struct {
	
} LINE;
*/
int line_cnt, stat_cnt;
int line_cost[2][STATION_MAX][STATION_MAX];
int stat_cost[STATION_MAX];
bool stat_flag[STATION_MAX];

void check_tonari( int lcost[STATION_MAX][STATION_MAX], int nowstat ) {
	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];
		}
	}
}

int main(void) {

	while(1) {
		scanf("%d %d\n", &line_cnt, &stat_cnt);
		if ( line_cnt==0 && stat_cnt== 0 ) { break; }
		
		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 );
			
			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( line_cost[type], minstat );
			}
			
			printf("%d\n", stat_cost[end]);
		}
	}
	
	return 0;
}

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

#define STAT_MAX 100
#define LINE_MAX 3000

int main(){
	int n,m,a,b;
	int start,goal,flg;

	int i,j;

	int lineNum;
	int lineCost[LINE_MAX][2];	//[lineId][flg]?????????????????????????????????

	int statNum;
	int statToNum[STAT_MAX];	//[statId]??\?¶???????????????????????????°
	int statTo[STAT_MAX][STAT_MAX];	//[statId][i]??\?¶??????????????????????????????????????????£????????????
	int statToId[STAT_MAX][STAT_MAX];	//[statId][i]??\?¶?????????????????????????id

	int yetNum;
	int yetId[STAT_MAX];	//?????¢?´¢???statId
	int yetDepth[STAT_MAX];	//?????¢?´¢???stat???????§???????
	int yetCost[STAT_MAX];	//?????¢?´¢???stat?????????????????????????????????
	int nowId,nowDepth,nowCost;

	int searchedNum;
	int searchedId[STAT_MAX];	//??¢?´¢?????????ID?????????
	int searchedTotal[STAT_MAX];	//?????????????´???????
	int result;

	while(1){
		//???????????±
		cin>>n>>m;if(!n && !m) break;
		lineNum=n;statNum=m;
		while(m--) statToNum[m]=0;
		for(i=0;i<n;i++){
			cin>>a>>b>>lineCost[i][0]>>lineCost[i][1];
			a--;b--;
			statTo[a][statToNum[a]]=b;statTo[b][statToNum[b]]=a;
			statToId[a][statToNum[a]]=i;statToId[b][statToNum[b]]=i;
			statToNum[a]++;statToNum[b]++;
		}
		//???????????????
		cin>>n;
		while(n--){
			cin>>start>>goal>>flg;
			start--;goal--;
			result=-1;yetNum=0;searchedNum=0;
			yetId[yetNum]=start;yetDepth[yetNum]=0;yetCost[yetNum]=0;yetNum++;
			while(yetNum--){
				//?????¢?´¢stat???????????????
				nowId=yetId[yetNum];
				nowDepth=yetDepth[yetNum];
				nowCost=yetCost[yetNum];
				//??¢?´¢???????????????
				searchedId[searchedNum]=nowId;
				searchedTotal[searchedNum]=searchedNum?searchedTotal[searchedNum-1]+nowCost:nowCost;
				searchedNum++;

				if(nowId==goal){
					if(result==-1 || searchedTotal[searchedNum-1]<result) result=searchedTotal[searchedNum-1];
					if(yetNum!=0) searchedNum=yetDepth[yetNum-1];
				}else{
					//??\?¶?????????????????§????????´¢????????¢?´¢??????yet?????????
					m=yetNum;	//??????????????????
					for(i=0;i<statToNum[nowId];i++){
						for(j=0;j<searchedNum-1;j++){
							if(statTo[nowId][i]==searchedId[j]) break;
						}
						if(j!=searchedNum-1) continue;
						yetId[yetNum]=statTo[nowId][i];
						yetDepth[yetNum]=nowDepth+1;
						yetCost[yetNum]=lineCost[statToId[nowId][i]][flg];
						yetNum++;
					}
					//??°?????§??????????????????
					if(m==yetNum){
						if(yetNum!=0) searchedNum=yetDepth[yetNum-1];
					}
				}
			}
			cout<<result<<endl;
		}
	}
	return 0;
}