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++: # define _CRT_SECURE_NO_WARNINGS 1
# define _USE_MATH_DEFINES
# include <iostream>
# include <numeric>
# include <string>
# include <bitset>
# include <vector>
# include <algorithm>
# include <cstdlib>
# include <cstdio>
# include <cstring>
# include <cstdlib>
# include <iomanip>
# include <queue>
# include <sstream>
# include <climits>
# include <cmath>
# include <list>
# include <functional>
# include <string>
# include <ctime>
# include <set>
# include <forward_list>
# include <map>
# include <stack>
using namespace std;
# define INF ((int)(1<<25))
# define REP(i,n) for(int i=0;i<(int)n;i++)
# define FOR(i,n) REP(i,n)
# define TORAD 2.0*M_PI/360.0
# define INT(x) int x;cin>>x;
# define ALL(x) (x).begin(),(x).end()
# define RALL(x) (x).rbegin(),(x).rend()
# define DEBUG(x) cout<<#x<<" :"<<x<<endl;
# define EPS 1e-12
template<class T> void debug(T a) { for (auto i : a)cout << i << endl; }
typedef vector<int> vi;
typedef vector<string> vs;
typedef pair<int, int> pii;
typedef pair<int, pii> piii;
int dx[4] = { 0,1,0,-1 }, dy[4] = { -1,0,1,0 };

int main()
{
	int n[2];
	while (cin >> n[0]&&n[0])
	{
		int t[2];
		int h, m;
		cin >> h >> m;
		t[0] = h * 60 + m;

		cin >> n[1];
		cin >> h >> m;
		t[1] = h * 60 + m;
		int x[][8] = { {0,0,0,0,0,0,0,0},{0,0,300,500,600,700,1350,1650},{0,0,0,350,450,600,1150,1500},{0,0,0,0,250,400,1000,1350},{0,0,0,0,0,250,850,1300},{0,0,0,0,0,0,600,1150},{0,0,0,0,0,0,0,500} };
		int ans = x[min(n[0], n[1])][max(n[0], n[1])];
		int p = 0;
		if (t[0] <= 17 * 60 + 30 && 17 * 60 + 30 <= t[1])p++;
		if (t[0] <= 19 * 60 + 30 && 19 * 60 + 30 <= t[1])p++;

		int d[] = { 6,7,5,5,20,15 };
		int D = 0;
		if (n[0] > n[1])swap(n[0], n[1]);
		while (n[0] < n[1])
		{
			D += d[n[0]-1];
			n[0]++;
		}
		DEBUG(D);
		if (p == 1 && D <= 40)
		{
			ans /= 2;
			while (ans % 50)ans++;
		}
		cout << ans << endl;


	}

}

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 check(int ih, int im, int oh, int om);

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 == 1) return 300;
		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 == 1) return 500;
		if(out == 2) return 350;
		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 == 1) return 600;
		if(out == 2) return 450;
		if(out == 3) return 250;
		if(out == 5) return 250;
		if(out == 6) return 850;
		if(out == 7) return 1300;
	} else if(in == 5){
		if(out == 1) return 700;
		if(out == 2) return 600;
		if(out == 3) return 400;
		if(out == 4) return 250;
		if(out == 6) return 600;
		if(out == 7) return 1150;
	} else if(in == 6){
		if(out == 1) return 1350;
		if(out == 2) return 1150;
		if(out == 3) return 1000;
		if(out == 4) return 850;
		if(out == 5) return 600;
		if(out == 7) return 500;
	} else if(in == 7){
		if(out == 1) return 1650;
		if(out == 2) return 1500;
		if(out == 3) return 1350;
		if(out == 4) return 1300;
		if(out == 5) return 1150;
		if(out == 6) 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 == 1) return 6;
		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 == 1) return 13;
		if(out == 2) return 7;
		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 == 1) return 18;
		if(out == 2) return 12;
		if(out == 3) return 5;
		if(out == 5) return 5;
		if(out == 6) return 25;
		if(out == 7) return 40;
	} else if(in == 5){
		if(out == 1) return 23;
		if(out == 2) return 17;
		if(out == 3) return 10;
		if(out == 4) return 5;
		if(out == 6) return 20;
		if(out == 7) return 35;
	} else if(in == 6){
		if(out == 1) return 43;
		if(out == 2) return 37;
		if(out == 3) return 30;
		if(out == 4) return 25;
		if(out == 5) return 20;
		if(out == 7) return 15;
	} else if(in == 7){
		if(out == 1) return 58;
		if(out == 2) return 52;
		if(out == 3) return 45;
		if(out == 4) return 40;
		if(out == 5) return 35;
		if(out == 6) 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) || check(ih, im, oh, om)) 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;
}

int check(int ih, int im, int oh, int om){
	if((ih > 17 || (ih == 17 && im >= 30)) && (ih < 19 || (ih == 19 && im <= 30))){
		if((oh > 17 || (oh == 17 && om >= 30)) && (oh < 19 || (oh == 19 && om <= 30))){
			return 1;
		}
	}
	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;
			if(price%50!=0){
				price += 50 - (price%50);
			}
		}
		cout<<price<<endl;
	}

	return 0;
}