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++: 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;
	
	}
	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;
	} else{
		cout <<"error!";
	}
}

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;
	} else{
		cout <<"error!";
	}
}

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 - 17 > 0 || (oh == 17 && om >= 30)){
			flag1 = 1;
		}
	}
	
	if(ih < 19 || (ih == 19 && im <= 30)){
		if(oh - 19 > 0 || (oh == 19 && om >= 30)){
			flag2 = 1;
		}
	}
	
	if((flag1 && flag2) || (!flag1 && !flag2)) return 0;
	else if((flag1 && !flag2) || (!flag1 && flag2)) 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 <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <cstdio>
#include <functional>
#include <numeric>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <utility>
#include <sstream>
#include <complex>

using namespace std;

#define FOR(i,a,b) for(long long i=(a);i<(b);i++)
#define REP(i,N) for(long long i=0;i<(N);i++)
#define ALL(s) (s).begin(),(s).end()
#define fi first
#define se second

#define PI acos(-1.0)
#define INF 1000000007
#define EPS 1e-10

typedef long long ll;
typedef pair<ll, ll> P;
typedef pair<double, double> PD;
typedef pair<string, ll> PS;
typedef vector<ll> V;

int table[7][7] = { { -1, 300, 500, 600, 700, 1350, 1650 },
{ 6, -1, 350, 450, 600, 1150, 1500 }, { 13, 7, -1, 250, 400, 1000, 1350 },
{ 18, 12, 5, -1, 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, g, h1, m1, h2, m2;
int main(){
	while (cin >> s&&s){
		cin >> h1 >> m1 >> g >> h2 >> m2;
		g--;
		s--;
		int sum; 
		if (table[g][s] <= 40){
			if (h1 < 17 || (h1 == 17 && m1 <= 30)){
				if (h2 < 19 || (h2 == 19 && m2 < 30)){
					if (table[s][g] / 2 % 50 == 0){
						sum = table[s][g] / 2 / 50 * 50;
					}
					else {
						sum = table[s][g] / 2 / 50 * 50 + 50;
					}
				}
				else {
					sum = table[s][g];
				}
			}
			else if (h1 > 17 || (h1 == 17 && m1 > 30)){
				if (h2 > 19 || (h2 == 19 && m2 >= 30)){
					if (table[s][g] / 2 % 50 == 0){
						sum = table[s][g] / 2 / 50 * 50;
					}
					else {
						sum = table[s][g] / 2 / 50 * 50 + 50;
					}
				}
				else{
					sum = table[s][g];
				}
			}
		}
		else sum = table[s][g];
		cout << sum << endl;
	}
}

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

int m(int h, int m) {
  return h*60+m;
}

int main() {
  int base[8][8] = {{0,0,0,0,0,0,0,0},
		    {0,0, 300,500,600,700,1350,1650},
		    {0,6, 0,  350,450,600,1150,1500},
		    {0,13,7,  0,  250,400,1000,1350},
		    {0,18,12, 5,  0,  250,850, 1300},
		    {0,23,17, 10, 5,  0,  600, 1150},
		    {0,43,37, 30, 25, 20, 0,   500},
		    {0,58,52, 45, 40, 35, 15,  0}};
  while(1) {
    int s,g;
    int sh, sm, gh, gm;
    cin >> s;
    if(s == 0) break;
    cin >> sh >> sm;
    cin >> g;
    cin >> gh >> gm;
    int temp;
    if(s > g) {
      temp = s;
      s = g;
      g = temp;
    }

    bool half = false;
    if(m(sh,sm) >= m(17,30) && m(sh,sm) <= m(19,30) && base[g][s] <= 40) {
      half = true;
    }
    else if(m(gh,gm) >= m(17,30) && m(gh,gm) <= m(19,30) && base[g][s] <= 40) {
      half = true;
    }
    if(half) {
      temp = (base[s][g] / 2 + 49) / 50 * 50;
      cout << temp << endl;
    } else {
      cout << base[s][g] << endl;
    }
  }
  return 0;
}