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:	
	NextNodesData()
	{

	}
	int nextNodesName;
	int nextNodesMany;
	int nextNodesTime;
};
class Nodes
{
public:
	Nodes()
	{
	}
	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++) 
	{
		for(int j = 0; j < nodesList.size(); j++)
		{
			nodesList[j].fixed = false;
		}
		int Start;
		int End;
		int mode;
		
		cin >> Start >> End;
		if(Start == 0 && End == 0)
		{
			return 0;
		}
		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<bits/stdc++.h>
#define INF 1e9
using namespace std;

int main(){
	int n,m;
	while(cin>>n>>m,n,m){
		int cost[114][514];
		int time[114][514];
		for(int i=0;i<=m;i++)
		for(int j=0;j<=m;j++)cost[i][j]=INF,time[i][j]=INF;
		
		for(int i=0;i<n;i++){
			int a,b,c,d;
			cin>>a>>b>>c>>d;
			cost[a-1][b-1]=c;
			cost[b-1][a-1]=c;
			time[a-1][b-1]=d;
			time[b-1][a-1]=d;
			}
			
		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]);	
		
		int e;
		cin>>e;
		for(int i=0;i<e;i++){
			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;	
			}
		}
		return 0;
	}

C++: #include <iostream>
#include <vector>
#include <queue>

using namespace std;

struct edge {
    int to;
    int cost;
};

struct status {
    int cost;
    int v;

    bool operator<(const status &another) const { return cost < another.cost; };

    bool operator>(const status &another) const { return cost > another.cost; };
};


int n;

vector<int> dijkstra(vector<vector<edge>> &graph, int s) {
    priority_queue<status, vector<status>, greater<>> que;
    vector<int> dis(n, 1145141919);
    dis[s] = 0;
    que.push({0, s});

    while (!que.empty()) {
        status now = que.top();
        que.pop();

        if (dis[now.v] < now.cost)continue;

        for (auto next:graph[now.v]) {
            if (dis[next.to] > dis[now.v] + next.cost) {
                dis[next.to] = dis[now.v] + next.cost;
                que.push({dis[next.to], next.to});
            }
        }
    }
    
    return dis;
}

int main() {
    while (true) {
        int m;
        cin >> m >> n;
        if (m == 0)break;

        vector<vector<edge>> graphc(n);
        vector<vector<edge>> grapht(n);
        for (int i = 0; i < m; i++) {
            int from, to, cost, time;
            cin >> from >> to >> cost >> time;
            from--;
            to--;
            graphc[from].push_back({to, cost});
            graphc[to].push_back({from, cost});
            grapht[from].push_back({to, time});
            grapht[to].push_back({from, time});
        }

        int k;
        cin >> k;
        for (int i = 0; i < k; i++) {
            int start, end, r;
            cin >> start >> end >> r;
            start--;
            end--;
            auto dis = dijkstra((r == 0 ? graphc : grapht), start);
            cout << dis[end] << endl;
        }
    }
    return 0;
}