Go: package main

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

var scanner = bufio.NewScanner(os.Stdin)

func main() {
	distance_table := [][]int{
		{0, 6, 13, 18, 23, 43, 58},
		{6, 0, 7, 12, 17, 37, 52},
		{13, 7, 0, 5, 10, 30, 45},
		{18, 12, 5, 0, 5, 25, 40},
		{23, 17, 10, 5, 0, 20, 35},
		{43, 37, 30, 25, 20, 0, 15},
		{58, 52, 45, 40, 35, 15, 0},
	}
	toll_table := [][]int{
		{0, 300, 500, 600, 700, 1350, 1650},
		{300, 0, 350, 450, 600, 1150, 1500},
		{500, 350, 0, 250, 400, 1000, 1350},
		{600, 450, 250, 0, 250, 850, 1300},
		{700, 600, 400, 250, 0, 600, 1150},
		{1350, 1150, 1000, 850, 600, 0, 500},
		{1650, 1500, 1350, 1300, 1150, 500, 0},
	}
	for scanner.Scan() {
		d, _ := strconv.Atoi(scanner.Text())
		if d == 0 {
			break
		}
		d--
		scanner.Scan()
		dbuf := strings.Split(scanner.Text(), " ")
		dh, _ := strconv.Atoi(dbuf[0])
		dm, _ := strconv.Atoi(dbuf[1])
		dtime := 100*dh+dm
		scanner.Scan()
		a, _ := strconv.Atoi(scanner.Text())
		a--
		scanner.Scan()
		abuf := strings.Split(scanner.Text(), " ")
		ah, _ := strconv.Atoi(abuf[0])
		am, _ := strconv.Atoi(abuf[1])
		atime := 100*ah+am
		toll := toll_table[d][a]
		if distance_table[d][a] <= 40 &&
			1730 <= dtime && dtime <= 1930 ||
			1730 <= atime && atime <= 1930 {
				toll = ((toll/2-1)/50+1)*50
		}
		fmt.Println(toll)
	}
}

C++: #include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;

int dis[7][7], cost[7][7];

void init() {
  dis[0][1] = 6; dis[0][2] = 13, dis[0][3] = 18, dis[0][4] = 23, dis[0][5] = 43, dis[0][6] = 58;
  dis[1][2] = 7, dis[1][3] = 12, dis[1][4] = 17, dis[1][5] = 37, dis[1][6] = 52;
  dis[2][3] = 5, dis[2][4] = 10, dis[2][5] = 30, dis[2][6] = 45;
  dis[3][4] = 5, dis[3][5] = 25, dis[3][6] = 40;
  dis[4][5] = 20, dis[4][6] = 35;
  dis[5][6] = 15;
  cost[0][1] = 300, cost[0][2] = 500, cost[0][3] = 600, cost[0][4] = 700, cost[0][5] = 1350, cost[0][6] = 1650;
  cost[1][2] = 350, cost[1][3] = 450, cost[1][4] = 600, cost[1][5] = 1150, cost[1][6] = 1500;
  cost[2][3] = 250, cost[2][4] = 400, cost[2][5] = 1000, cost[2][6] = 1350;
  cost[3][4] = 250, cost[3][5] = 850, cost[3][6] = 1300;
  cost[4][5] = 600, cost[4][6] = 1150;
  cost[5][6] = 500;
}

bool in_range(int h, int m) {
  if (h < 17 || h > 19) return false;
  if (h == 17 && m < 30) return false;
  if (h == 19 && m > 30) return false;
  return true;
}

int main() {
  cin.tie(0);
  ios_base::sync_with_stdio(false);
  cout << fixed << setprecision(10);
  
  init();
  int d, a;
  while (cin >> d, d) {
    int hd, md, ha, ma;
    cin >> hd >> md >> a >> ha >> ma;
    d--, a--;
    if (d > a) swap(d, a);
    bool ok = (dis[d][a] <= 40);
    ok &= (in_range(hd, md) || in_range(ha, ma));
    cout << (ok ? (cost[d][a] / 2 + 50 - 1) / 50 * 50 : cost[d][a]) << endl;
  }

  return 0;
}

C++: #include<iostream>
using namespace std;
int main(){
	
	int d[7][7] = 
	{{ -1,300,500,600,700,1350,1650}
	,{  6, -1,350,450,600,1150,1500}
	,{ 13,  7,  0,250,400,1000,1350}
	,{ 18, 12,  5,  0,250, 850,1300}
	,{ 23, 17, 10,  5, -1, 600,1150}
	,{ 43, 37, 30, 25, 20,  -1, 500}
	,{ 58, 52, 45, 40, 35,  15,  -1}};
	
	

	int s,t,hs,ms,ht,mt;
	while(cin>>s,s){
		cin>>hs>>ms>>t>>ht>>mt;
		ms += hs*60;
		mt += ht*60;
		s--,t--;
		bool flg = false;
		if((17*60+30<=ms&&ms<=19*60+30)
		 ||(17*60+30<=mt&&mt<=19*60+30))flg = true;
		int price = d[s][t];
		if(d[t][s] <= 40 && flg){
			price/=2;
		}
		cout<<price<<endl;
	}

	return 0;
}

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

int charge(int in, int out);
int dist(int in, int out);
int checkhalf(int ih, int im, int oh, int om, int dis);
int half(int y);

int main(){
	int inic, inh, inm, outic, outh, outm, yen, kyori;
	while(1){
		cin >>inic;
		if(inic == 0) break;
		cin >>inh >>inm >>outic >>outh >>outm;
		
		yen = charge(inic, outic);
		kyori = dist(inic, outic);
		if(checkhalf(inh, inm, outh, outm, kyori)) yen = half(yen);
		
		cout <<yen <<endl;
	}
	return 0;
}

int charge(int in, int out){
	if(in == 1){
		if(out == 2) return 300;
		if(out == 3) return 500;
		if(out == 4) return 600;
		if(out == 5) return 700;
		if(out == 6) return 1350;
		if(out == 7) return 1650;
	} else if(in == 2){
		if(out == 3) return 350;
		if(out == 4) return 450;
		if(out == 5) return 600;
		if(out == 6) return 1150;
		if(out == 7) return 1500;
	} else if(in == 3){
		if(out == 4) return 250;
		if(out == 5) return 400;
		if(out == 6) return 1000;
		if(out == 7) return 1350;
	} else if(in == 4){
		if(out == 5) return 250;
		if(out == 6) return 850;
		if(out == 7) return 1300;
	} else if(in == 5){
		if(out == 6) return 600;
		if(out == 7) return 1150;
	} else if(in == 6){
		if(out == 7) return 500;
}

int dist(int in, int out){
	if(in == 1){
		if(out == 2) return 6;
		if(out == 3) return 13;
		if(out == 4) return 18;
		if(out == 5) return 23;
		if(out == 6) return 43;
		if(out == 7) return 58;
	} else if(in == 2){
		if(out == 3) return 7;
		if(out == 4) return 12;
		if(out == 5) return 17;
		if(out == 6) return 37;
		if(out == 7) return 52;
	} else if(in == 3){
		if(out == 4) return 5;
		if(out == 5) return 10;
		if(out == 6) return 30;
		if(out == 7) return 45;
	} else if(in == 4){
		if(out == 5) return 5;
		if(out == 6) return 25;
		if(out == 7) return 40;
	} else if(in == 5){
		if(out == 6) return 20;
		if(out == 7) return 35;
	} else if(in == 6){
		if(out == 7) return 15;
	}
}

int checkhalf(int ih, int im, int oh, int om, int dis){
	int flag1 = 0, flag2 = 0;
	if(dis > 40) return 0;
	
	if(ih < 17 || (ih == 17 && im <= 30)){
		if((oh == 19 && om < 30) || oh < 19){
			flag1 = 1;
		}
	}
	
	if(ih > 17 || (ih == 17 && im > 30)){
		if((oh == 19 && om >= 30) || oh > 19){
			flag2 = 1;
		}
	}
	
	if((flag1 && flag2) || (!flag1 && !flag2)) return 0;
	else return 1;
}

int half(int y){
	int temp = y;
	
	temp /= 2;
	if(temp % 50 != 0){
		temp = temp + abs((temp % 50) - 50);
	}
	
	return temp;
}

C++: #include<iostream>
#include<algorithm>
#include<vector>
#include<queue>
#define lol(i,n) for(int i=0;i<n;i++)
#define mod 1000000007
typedef long long ll;
using namespace std;
int d[7][7]={
  {0,300,500,600,700,1350,1650},
  {6,0,350,450,600,1150,1500},
  {13,7,0,250,400,1000,1350},
  {18,12,5,0,250,850,1300},
  {23,17,10,5,0,600,1150},
  {43,37,30,25,20,0,500},
  {58,52,45,40,35,15,0}
};
int main(){
  int a,b,h1,h2,m1,m2;
  while(cin>>a&&a){
    cin>>h1>>m1>>b>>h2>>m2;
    m1+=h1*100,m2+=h2*100;
    a--,b--;
    if(a>b)swap(a,b);
    int tmp=d[a][b];
    if(d[b][a]<=40&&((1730<=m1&&m1<=1930)||(1730<=m2&&m2<=1930)))tmp/=2;
    if(tmp%50>0)tmp+=50-tmp%50;
    cout<<tmp<<endl;
  }
  return 0;
}