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 <iomanip>
#include <sstream>
#include <stdio.h>
#include <vector>
#include <stack>
#include <queue>
#include <algorithm>
#include <math.h>
#include <utility>
#include <string>
#include <ctype.h>
#include <cstring>
#include <cstdio>
#include <sstream>
#include <functional>
 
using namespace std;
 
#define FOR(i,k,n) for(int i = (k); i < (n); i++)
#define REP(i,n) FOR(i,0,n)
#define INF 114514810
#define ll long long
//#define scanf scanf_s
 
int cost[101][101];
int time_[101][101];
 
 
int main()
{
    int n, m;
    while (scanf("%d%d",&n,&m))
    {
        if (!n&&!m) break;
        REP(i, 101)REP(j, 101)
        {
                cost[i][j] = INF;
                time_[i][j] = INF;
        }
         
        REP(i, n)
        {
            int a, b, c, t;
			scanf("%d%d%d%d", &a, &b, &c, &t);
            a--; b--;
            cost[a][b] = cost[b][a] = c;
            time_[a][b] = time_[b][a] = t;
        }
 
        REP(i, m)REP(j, m)REP(k, m)
        {
            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 k;
		scanf("%d", &k);
        REP(i, k)
        {
            int p, q, r;
			scanf("%d%d%d", &p, &q, &r);
            p--; q--;
			if (r == 0) printf("%d\n", cost[p][q]);
			else  printf("%d\n", time_[p][q]);
        }
    }
    return 0;
}

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

int t[303][303];
int c[303][303];

int main() {
  for( int N, M; cin >> M >> N, (N || M); ) {
    
    for(int i = 0; i < N; i++)
      for(int j = 0; j < N; j++) {
        t[i][j] = 987654321;
        c[i][j] = 987654321;
      }

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

C++: #include<iostream>
using namespace std;
int MAX=100000;
int main(){
  while(true){
    int n,m;
    cin>>n>>m;
    if(!n&&!m)
      break;
    int a,b,cost,timer;
    int costs[m][m];
    int timers[m][m];
    for(int i=0;i<m;i++){
      for(int j=0;j<m;j++){
        costs[i][j]=MAX;
        timers[i][j]=MAX;
      }
      costs[i][i]=0;
      timers[i][i]=0;
    }

    for(int i=0;i<n;i++){
      cin>>a>>b>>cost>>timer;
      costs[a-1][b-1]=cost;
      timers[a-1][b-1]=timer;
      costs[b-1][a-1]=cost;
      timers[b-1][a-1]=timer;
    }
    for(int i=0;i<m;i++){
      for(int j=0;j<m;j++){
        for(int k=0;k<m;k++){
          if(costs[j][k]>(costs[j][i]+costs[i][k])){
            costs[j][k]=costs[j][i]+costs[i][k];
            costs[k][j]=costs[j][i]+costs[i][k];
          }
          if(timers[j][k]>(timers[j][i]+timers[i][k])){
            timers[j][k]=timers[j][i]+timers[i][k];
            timers[k][j]=timers[j][i]+timers[i][k];
          }
        }
      }
    }
    int k;
    int p;
    int q;
    bool r;
    cin>>k;
    for(int i=0;i<k;i++){
      cin>>p>>q>>r;
      if(r){
        cout<<timers[p-1][q-1]<<endl;
      }else if(!r){
        cout<<costs[p-1][q-1]<<endl;
      }
    }
  }
    return 0;
}

C++: #include<cstdio>
#include<cstring>
#include<algorithm>
#include<functional>
#include<iostream>
#include<queue>
#define rep(i,a,b) for(i=a;i<b;i++)
#define F1 first.first
#define F2 first.second
#define F3 second
#define INF 2100000000
#define long long int int
using namespace std;
typedef pair<pair<int,int>,int> P1;
typedef pair<int,int> P2;
int main(void)
{
	int i,j,k,n,m,x,s,e;
	int a,b,cos,tim,st,en,way;
	int leng[1001],kami[1002];
	P1 glid1[6000],glid2[6000];
	P2 tori;
	while(1) {
		cin>>n>>m;
		if(n==0&&m==0) break;
		rep(i,0,n) {
			cin>>a>>b>>cos>>tim;
			glid1[i*2].F1=a,glid1[i*2].F2=b,glid1[i*2].F3=cos;
			glid2[i*2].F1=a,glid2[i*2].F2=b,glid2[i*2].F3=tim;
			glid1[i*2+1].F1=b,glid1[i*2+1].F2=a,glid1[i*2+1].F3=cos;
			glid2[i*2+1].F1=b,glid2[i*2+1].F2=a,glid2[i*2+1].F3=tim;
		}
		sort(glid1,glid1+m*2);sort(glid2,glid2+m*2);
		kami[1]=0;
		rep(i,1,m*2) {
			if(glid1[i].F1!=glid1[i-1].F1) {
				x=glid1[i].F1;
				kami[x]=i;
			}
		}
		kami[n+1]=m*2;
		priority_queue<P2,vector<P2>,greater<P2> > que;
		cin>>k;
		rep(i,0,k) {
			cin>>st>>en>>way;
			for(j=1;j<=n;j++) leng[j]=INF;
			while(!que.empty()) que.pop();
			que.push(P2(0,st));
			while(!que.empty()) {
				tori=que.top(),que.pop();
				a=tori.first,b=tori.second;
				if(a<leng[b]) {
					leng[b]=a;
					if(b==en) break;
					s=kami[b],e=kami[b+1];
					if(way==0)rep(j,s,e) que.push(P2(a+glid1[j].F3,glid1[j].F2));
					else rep(j,s,e) que.push(P2(a+glid2[j].F3,glid2[j].F2));
				}
			}
			cout<<leng[en]<<endl;
		}
	}
	return 0;
}