Go: // Warshall–Floyd Algorithm

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

var scanner = bufio.NewScanner(os.Stdin)

const INF = 0x7FFFFFFF

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<cstdio>
#include<iostream>
#include<vector>
#include<algorithm>
#include<map>
#include<set>
#include<queue>
#include<string>

using namespace std;

#define rep(i,n) for(int i=0;i<int(n);i++)
#define reps(i,n) for(int i=1;i<=int(n);i++)
#define sint(i) scanf("%d",&i);
#define sintt(i,j) scanf("%d%d",&i,&j);
#define sinttt(i,j,k) scanf("%d%d%d",&i,&j,&k);
#define sintttt(i,j,k,m) scanf("%d%d%d%d",&i,&j,&k,&m);

#define INF 1010000000
int dx[]={1,0,-1,0};
int dy[]={0,1,0,-1};

int main(){
	while(1){
		int n,m;
		int time[101][101];
		int cost[101][101];
		
		rep(i,101)rep(j,101)time[i][j]=cost[i][j]=INF;
		
		sintt(n,m);
		if(n==0)break;
		rep(i,n){
			int a,b,c,d;
			sintttt(a,b,c,d);
			
			time[a][b]=d;
			time[b][a]=d;
			
			cost[a][b]=c;
			cost[b][a]=c;
		}
		
		reps(k,n){
			reps(i,n){
				reps(j,n){
					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 q;
		sint(q);
		rep(i,q){
			int a,b,c;
			sinttt(a,b,c);
			if(c==1){
				printf("%d\n",time[a][b]);
			}else{
				printf("%d\n",cost[a][b]);
			}
		}
	}
}

C++: #include <bits/stdc++.h>
using namespace std ;

#define pb(n) push_back(n)
#define fi first
#define se second
#define all(r) (r).begin(),(r).end()
#define gsort(st,en) sort((st),(en),greater<int>())
#define vmax(ary) *max_element(all(ary))
#define vmin(ary) *min_element(all(ary))
#define debug(x) cout<<#x<<": "<<x<<endl
#define fcout(n) cout<<fixed<<setprecision((n))
#define scout(n) cout<<setw(n)
#define vary(type,name,size,init) vector< type> name(size,init)

#define rep(i,n) for(int i = 0; i < (int)(n);++i)
#define REP(i,a,b) for(int i = (a);i < (int)(b);++i)
#define repi(it,array) for(auto it = array.begin(),end = array.end(); it != end;++it)
#define repa(n,array) for(auto &n :(array))

using ll = long long;
using vi = vector<int>;
using vl = vector<ll>;
using dict = map<string,int>;
using pii = pair<int,int> ;

const int mod = 1000000007;
constexpr int imax = ((1<<30)-1)*2+1 ;
constexpr int inf = 100000000;
constexpr double PI = acos(-1.0) ;
double eps = 1e-10 ;
const int dy[] = {-1,0,1,0};
const int dx[] = {0,-1,0,1};

inline bool value(int x,int y,int w,int h){
  return (x >= 0 && x < w && y >= 0 && y < h);
}

template<typename T>
void Unique(vector<T> &v){
  sort(all(v));
  v.erase(unique(all(v)),v.end());
}

template<typename T>
T ston(string& str, T n){
  istringstream sin(str) ;
  T num ;
  sin >> num ;
  return num ;
}

void Ans(bool f){
  if(f) cout << "YES"<<endl;
  else cout << "NO"<<endl;
}

struct Edge{
  int to;
  long long cost;
};

struct NODE{
  int pos;
  long long cost;
};
bool operator < (const NODE &a,const NODE &b){
  return a.cost > b.cost;
}

int N;
const ll INF = 1e15;
vector<ll> dijkstra(vector<Edge> g[100000], int s){
  priority_queue<NODE> Q;
  Q.push({s,0});
  vector<ll> res(N+2,INF);
  while(Q.size()){
    NODE q= Q.top();Q.pop();
    if(res[q.pos] == INF){
      res[q.pos] = q.cost;
    }
    else{
      continue;
    }
    for(auto n : g[q.pos]){
      Q.push({n.to,q.cost+n.cost});
    }
  }
  return res;
}
int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  int n,m;
  while(cin>>N>>m&&N&&m){
    int a,b,c,d;
    vector<Edge> g[100000],rg[100000];
    rep(i,N){
      cin >> a >> b >> c >> d;
      g[a].push_back({b,c});
      rg[a].push_back({b,d});
      g[b].push_back({a,c});
      rg[b].push_back({a,d});
    }
    int k,p,q,r ;
    cin >> k;
    vector<ll> ansd[N+1],anst[N+1];
    rep(i,N){
      ansd[i+1] = dijkstra(g,i+1);
      anst[i+1] = dijkstra(rg,i+1);
    }
    rep(i,k){
      cin >> p >> q >> r;
      if(r){
        cout << anst[p][q]<<endl;
      }
      else
      {
        cout << ansd[p][q]<<endl;
      }
    }
  }
  return 0;
}

C++: #include<iostream>
#include<string.h>
using namespace std;
#define WHITE 0
#define GLAY 1
#define BLACK 2
#define INF 9999
int kingaku(void);
int saitan(void);
int n,m,p,q;
int cost[101][101],timev[101][101];
int main()
{
	int a,b,c,t,k,r;
	while(1){
		memset(cost,INF,sizeof(cost));
		memset(timev,INF,sizeof(timev));
		cin >> n >> m;
		if(n==0 && m==0) break;
		for(int i=0;i<n;i++){
			cin >> a >> b >> c >> t;
			cost[a][b] = cost[b][a] = c;
			timev[a][b] = timev[b][a] = t;
		}
		cin >> k;
		for(int i=0;i<k;i++){
			cin >> p >> q >> r;
			if(r==0){
				cout << kingaku() << endl;
			}
			else if(r==1)
				cout << saitan() << endl;
		}
	}
	return 0;
}

int kingaku()
{
	int minv;
	int dd[100],color[100];

	for(int i=0;i<n;i++){
		dd[i] = INF;
		color[i] = WHITE;
	}
	dd[p] = 0;
	color[p] = GLAY;
	while(1){
		minv = INF;
		int u = -1;
		for(int i=1;i<=m;i++){
			if(minv > dd[i] && color[i] != BLACK ){
				u = i;
				minv = dd[i];
			}
		}
		if(u == -1) break;
		color[u] = BLACK;
		//cout << "C=" << u;
		for(int v=1;v<=m ;v++){
			if(color[v] != BLACK && cost[u][v] != INF){
				if(dd[v] > dd[u] + cost[u][v]){	
					dd[v] = dd[u] + cost[u][v];
				}
			}
		}
	}
	//for(int i=0;i<n;i++) cout << dd[i] << endl;
	return dd[q];
}

int saitan()
{
	int minv;
	int dd[100],color[100];

	for(int i=0;i<n;i++){
		dd[i] = INF;
		color[i] = WHITE;
	}
	dd[p] = 0;
	color[p] = GLAY;
	while(1){
		minv = INF;
		int u = -1;
		for(int i=0;i<n;i++){
			if(minv > dd[i] && color[i] != BLACK ){
				u = i;
				minv = dd[i];
			}
		}
		if(u == -1) break;
		color[u] = BLACK;
		for(int v=1;v<=m;v++){
			if(color[v] != BLACK && timev[u][v] != INF){
				if(dd[v] > dd[u] + timev[u][v]){	//d[v]:??????
					dd[v] = dd[u] + timev[u][v];
				}
			}
		}
	}
	//for(int i=0;i<n;i++) cout << dd[i] << endl;
	return dd[q];
}