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<vector>
using namespace std;
class NextNodesData
{
public:
	int nextNodesName;
	int nextNodesMany;
	int nextNodesTime;
};
class Nodes
{
public:
	vector<NextNodesData> nextNodes;
	int name;
	int minValue;
	bool fixed;
};

int main()
{
	int N, M;
	cin >> N >> M;
	vector<Nodes> nodesList;
	for(int i = 0; i < M; i++)
	{
		Nodes nodes;
		nodes.name = i+1;
		nodesList.push_back(nodes);
	}
	for(int i = 0; i < N; i++)
	{
		int Start;
		int End;
		int Many;
		int Time;
		cin >> Start >> End >> Many >> Time;

		NextNodesData nodes;
		nodes.nextNodesName = End;
		nodes.nextNodesMany = Many;
		nodes.nextNodesTime = Time;
		nodesList[Start - 1].nextNodes.push_back(nodes);
	}

	int Query;
	cin >> Query;

	for(int i = 0; i < Query; i++) //200
	{
		for(int j = 0; j < nodesList.size(); j++)
		{
			nodesList[j].fixed = false;
		}
		int Start;
		int End;
		int mode;
		
		cin >> Start >> End;
		cin >> mode;

		nodesList[Start - 1].fixed = true;
		nodesList[Start - 1].minValue = 0;
		int nextFixedNodesName = Start;

		vector<Nodes> candidate;
		while(1)
		{
			for(int j = 0; j < nodesList[nextFixedNodesName - 1].nextNodes.size(); j++)
			{
				Nodes obj;
				obj.name = nodesList[nextFixedNodesName - 1].nextNodes[j].nextNodesName;
				if(nodesList[obj.name - 1].fixed == true)
				{
					continue;
				}
				if(mode == 0)
				{
					obj.minValue = nodesList[nextFixedNodesName - 1].minValue + nodesList[nextFixedNodesName - 1].nextNodes[j].nextNodesMany;
				}
				else
				{
					obj.minValue = nodesList[nextFixedNodesName - 1].minValue + nodesList[nextFixedNodesName - 1].nextNodes[j].nextNodesTime;
				}
				candidate.push_back(obj);				   
			}

			int minValue = 1001;
			int minName  = -1;
			for(int j = 0; j < candidate.size(); j++)
			{
				
				if(candidate[j].minValue < minValue)
				{
					minValue = candidate[j].minValue;
					minName = candidate[j].name;
				}
			}
			if(minName == End)
			{
				cout << minValue << endl;
				break;
			}
			nodesList[minName - 1].minValue = minValue;
			nodesList[minName - 1].fixed = true;
			nextFixedNodesName = minName;

			for(auto itr = candidate.begin(); itr != candidate.end();)
			{
				if(nodesList[itr->name - 1].fixed == true)
				{
					itr = candidate.erase(itr);
				}
				else
				{
					itr++;
				}
			}
		}
		

	} 

	return 0;

}

C++: #include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;
int c[111][111];
int t[111][111];
int main(void){
  while(1){
    int n,m;
    cin >> n >> m;

    if(!n && !m) break;

    for(int i = 1 ; i <= m; i++){ 
      fill(c[i], c[i] + m + 1, 1 << 20);
      fill(t[i], t[i] + m + 1, 1 << 20);
      c[i][i] = 0;
      t[i][i] = 0;
    }
    for(int i = 0 ; i < n; i++){
      int a,b,cost,time;
      cin >> a >> b >> cost >> time;
      c[a][b] = min(c[a][b],cost);
      c[b][a] = min(c[b][a],cost);
      t[a][b] = min(t[a][b],time);
      t[b][a] = min(t[b][a],time);
    }
    for(int k =1; k <= m; k++){
      for(int i = 1; i <= m; i++){
	for(int j = 1; j <= m; j++){
	  c[i][j] = min(c[i][j],c[i][k] + c[k][j]);
	  t[i][j] = min(t[i][j],t[i][k] + t[k][j]);
	}
      }
    }
    int q;
    cin >> q;
    for(int i = 0; i < q; i++){
      int a,b,f;
      cin >> a >> b >> f;
      if(f){
	cout << t[a][b] << endl;
      }else{
	cout << c[a][b] << endl;
      }
    }
  }
}

C++: #include <iostream>
using namespace std;
#define REP(i,n) for (int i=0; i<(n); ++i)

int main() {
    ios::sync_with_stdio(false);
    int n, m;
    while (cin >> n >> m, n || m) {
        int d[2][101][101];
        REP(i,2) REP(j,m+1) REP(k,m+1) {
            d[i][j][k] = (j == k ? 0 : 1e8);
        }
        int a, b, cost, time;
        REP(i,n) {
            cin >> a >> b >> cost >> time;
            d[0][a][b] = min(d[0][a][b], cost);
            d[0][b][a] = min(d[0][b][a], cost);
            d[1][a][b] = min(d[1][a][b], time);
            d[1][b][a] = min(d[1][b][a], time);
        }
        REP(k,m+1) REP(i,m+1) REP(j,m+1) {
            d[0][i][j] = min(d[0][i][j], d[0][i][k] + d[0][k][j]);
            d[0][j][i] = min(d[0][j][i], d[0][j][k] + d[0][k][i]);
            d[1][i][j] = min(d[1][i][j], d[1][i][k] + d[1][k][j]);
            d[1][j][i] = min(d[1][j][i], d[1][j][k] + d[1][k][i]);
        }
        int k, p, q, r;
        cin >> k;
        REP(i,k) {
            cin >> p >> q >> r;
            cout << d[r][p][q] << endl;
        }
    }
    return 0;
}

C++: #include<iostream>
#include<algorithm>
#include<vector>
#include<map>
#include<queue>
#define INF (1<<30)
#define COST 0
#define TIME 1

using namespace std;

typedef pair<int, int> p;

vector<p> costs[105], times[105];
int dist[105];
void dijkstra(vector<p> *edge, int s){
	fill(dist, dist + 105, INF);
	dist[s] = 0;
	priority_queue<p, vector<p>, greater<p> > q;
	q.push(p(0, s));
	while(!q.empty()){
		p tmp = q.top();q.pop();
		int d = tmp.first, from = tmp.second;
		if(dist[from] < d)continue;		
		for(int i = 0; i < edge[from].size(); i++){
			int to = edge[from][i].first, c = edge[from][i].second;
			if(dist[to] < dist[from] + c)continue;
			dist[to] = dist[from] + c;
			q.push(p(dist[to], to));
		}
	}
}

int main(){
	int n, m;
	cin >> n >> m;
	for(int i = 0; i < n; i++){
		int a, b, c, t;
		cin >> a >> b >> c >> t;
		costs[a].push_back(p(b, c));
		costs[b].push_back(p(a, c));
		times[a].push_back(p(b, t));
		times[b].push_back(p(a, t));
	}
	int k;
	cin >> k;
	for(int i = 0; i < k; i++){
		int p, q, r;
		cin >> p >> q >> r;
		if(r == COST){
			dijkstra(costs, p);
		}else{
			dijkstra(times, p);
		}
		cout << dist[q] << endl;
	}
	return 0;
}