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<stdio.h>

int dijkstra(short int,short int,short int,short int,short int**);

int main(void)
{
	short int f1, f2, n, m, a, b, ic, ti, k, p, q, r, out, **cost, **time;

	while(scanf("%d %d",&n,&m) && n > 0)
	{

		cost = new short int *[m];
		time = new short int *[n];
		//線路設計
		for(f1 = 0; f1 < n; f1++)
		{
			cost[f1] = new short int [m];
			time[f1] = new short int [m];
			for(f2 = 0; f2 < m; f2++)
			{
				cost[f1][f2] = 0;
				time[f1][f2] = 0;
			}
		}
		//線路情報入力
		for(f1 = 0; f1 < n; f1++)
		{
			scanf("%d %d %d %d",&a, &b, &ic, &ti);
			a--;
			b--;
			cost[a][b] = ic;
			cost[b][a] = ic;
			time[a][b] = ti;
			time[b][a] = ti;
		}
		//問い合わせ入力
		scanf("%d",&k);
		for(f1 = 1; f1 <= k; f1++)
		{
			scanf("%d %d %d",&p, &q, &r);
			p--;
			q--;
			if(r == 0)
				out = dijkstra(n, m, p, q, cost);
			else
				out = dijkstra(n, m, p, q, time);

			printf("%d\n",out);
		}
	}
	return 0;
}

int dijkstra(short int n,short int m,short int p,short int q,short int **temp)
{
	int *C, *sum, f1, po = p, min;
	//Cの中身　0：出発していない　1：出発した
	C = new int [m];
	sum = new int [m];
	//初期化
	for(f1 = 0; f1 < m; f1++)
	{
		C[f1] = 0;
		sum[f1] = 0;
	}
	//ダイクストラ探索
	while(po != q)
	{
		//現在いる地点から次の駅までにかかるコストを計算し次に行く駅の現時点での最小コストを求める
		for(f1 = 0; f1 < m; f1++)
		{
			if(temp[po][f1] > 0)
			{
				if(C[f1] == 0 && (sum[f1] == 0 || temp[po][f1] + sum[po] < sum[f1]))
					sum[f1] = temp[po][f1] + sum[po];
			}
		}
		//出発していない駅の中で最小コストを選択する
		min = 0;
		C[po] = 1;
		for(f1 = 0; f1 < m; f1++)
		{
			if(C[f1] == 0 && sum[f1] != 0 && (min == 0 || sum[f1] < min))
			{
				min = sum[f1];
				po = f1;
			}
		}
	}
	return sum[q];
}

C++: #include <assert.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_N 100
#define MAX_M 3000
#define NUMBER_OF_NODES MAX_N * MAX_M

#define SWAP(type, a, b) do {type _tmp; _tmp = a; a = b; b = _tmp;} while(0)

typedef struct {
	int v;
	int dist;
} state;

bool greater(state a, state b) {
	return a.dist > b.dist;
}

// priority_queue
typedef state value_type;

typedef struct skew_heap{
	struct skew_heap *left, *right;
	value_type value;
} skew_heap;

skew_heap *meld(skew_heap *a, skew_heap *b) {
	if(a == NULL) return b;
	if(b == NULL) return a;
	if(greater(a->value, b->value)) SWAP(skew_heap *, a, b);
	a->right = meld(a->right, b);
	SWAP(skew_heap *, a->left, a->right);
}

int next_index = 0;
skew_heap nodes[NUMBER_OF_NODES];
skew_heap *root = NULL;

bool empty() {
	return root == NULL;
}

void enqueue(value_type value) {
	skew_heap *new_node = (nodes + next_index);
	next_index = (next_index + 1) % NUMBER_OF_NODES;
	new_node->left = NULL;
	new_node->right = NULL;
	new_node->value = value;
	root = meld(root, new_node);
}

value_type dequeue() {
	if(root == NULL) return (value_type){-1, -1};
	value_type res = root->value;
	root = meld(root->left, root->right);
	return res;
}

void clear() {
	root = NULL;
}

// graph
int n, m;
int num;
int head[MAX_N], next[MAX_M * 2], to[MAX_M * 2];
int costs[MAX_M * 2], times[MAX_M * 2];
int dist[MAX_N];

void init() {
	num = 0;
	memset(head, -1, sizeof(head));
}

void add_edge(int u, int v, int c, int t) {
	next[num] = head[u];
	head[u] = num;
	to[num] = v;
	costs[num] = c;
	times[num] = t;
	++num;
}

// calc dist
int dijkstra(int start, int goal, int r) {
	int i, e;
	const int *weight = (r ? times : costs);

	for(i = 0; i < n; ++i) dist[i] = INT_MAX;
	dist[start] = 0;
	clear();
	enqueue((state){start, 0});

	while(!empty()) {
		state current = dequeue();
		if(dist[current.v] < current.dist)
			continue;

		if(current.v == goal)
			return dist[goal];

		for(e = head[current.v]; e != -1; e = next[e]) {
			int next_dist = current.dist + weight[e];
			if(dist[to[e]] > next_dist) {
				dist[to[e]] = next_dist;
				enqueue((state){to[e], next_dist});
			}
		}
	}
	assert(false);
}

int main(void) {
	int i;
	while(scanf("%d%d", &m, &n) == 2 && n) {
		init();
		for(i = 0; i < m; ++i) {
			int u, v, c, t;
			scanf("%d%d%d%d", &u, &v, &c, &t);
			--u; --v;
			add_edge(u, v, c, t);
			add_edge(v, u, c, t);
		}

		int query;
		scanf("%d", &query);

		while(query--) {
			int start, goal, r;
			scanf("%d%d%d", &start, &goal, &r);
			printf("%d\n", dijkstra(start - 1, goal - 1, r));
		}
	}
	return EXIT_SUCCESS;
}