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 <iostream>
#include <fstream>
#include <algorithm>
#include <cassert>
#include <cctype>
#include <cmath>
#include <complex>
#include <cstdio>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>
using namespace std;

#define rep(i,n) for(int i=0;i<n;i++)

int s,sh,sm,g,gh,gm,ng[][2]={{0,5},{0,6},{1,6},{2,6}},t[][7]={{0,300,500,600,700,1350,1650},{0,0,350,450,600,1150,1500},{0,0,0,250,400,1000,1350},{0,0,0,0,250,850,1300},{0,0,0,0,0,600,1150},{0,0,0,0,0,0,500}};

int main(){
	while(cin>>s&&s){
		cin>>sh>>sm>>g>>gh>>gm;
		s--;g--;
		if(s>g)swap(s,g);
		int st=sh*60+sm,gt=gh*60+gm;
		int ok=1;
		rep(i,4)if(s==ng[i][0]&&g==ng[i][1])ok=0;
		if(ok&&(st<=1050&&gt>=1050&&gt<=1170||st>=1050&&st<=1170&&gt>=1170))cout<<(t[s][g]/50+1)/2*50<<endl;
		else cout<<t[s][g]<<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 main(){
	while(1){
		int inic, inh, inm, outic, outh, outm, yen, kyori;
		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 flag = 0;
	if(dis > 40){
		return 0;
	}
	
	if(ih > oh || (ih == oh && im > om)){
		if((ih > 17 || (ih == 17 && im >= 30)) && (ih < 19 || (ih == 19 && im <= 30))){
			if(oh < 17 || (oh == 17 && om < 30)){
				return 0;
			}
		}
		if(ih > 19 || (ih == 19 && im > 30)){
			if((oh > 17 || (oh == 17 && om >= 30)) && (oh < 19 || (oh == 19 && om <= 30))){
				return 0;
			}
		}
	}
	
	if((ih < 17 || (ih == 17 && im <= 30)) && (oh < 19 || (oh == 19 && om < 30))){	//17æèO©A1730ªÈOÉüèA19æèO©A1930ªæèOÉo½
		flag = 1;
	}
	if((ih > 17 || (ih == 17 && im > 30)) && (oh > 19 || (oh == 19 && om >= 30))){	//17æèã©A1730ªæèãÉüèA19æèã©A1930ªÈ~Éo½
		flag = 1;
	}
	if(ih == oh && im == om && flag){												//flagª1ÅAüéÔÆoéÔª¯¶¾Á½
		flag = 0;
	}
	return flag;
}

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

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

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

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