Codeforces Round #384 (Div. 2) A. Vladik and flights【思维】水题

A. Vladik and flights

time limit per test
2 seconds

memory limit per test
256 megabytes

input
standard input

output
standard output

Vladik is a competitive programmer. This year he is going to win the International Olympiad in Informatics. But it is not as easy as it sounds: the question Vladik face now is to find the cheapest way to get to the olympiad.

Vladik knows n airports. All the airports are located on a straight line. Each airport has unique id from1 to
n, Vladik's house is situated next to the airport with ida, and the place of the olympiad is situated next to the airport with idb. It is possible
that Vladik's house and the place of the olympiad are located near the same airport.

To get to the olympiad, Vladik can fly between any pair of airports any number of times, but he has to start his route at the airporta and finish it at the airport
b.

Each airport belongs to one of two companies. The cost of flight from the airporti to the airport
j is zero if both airports belong to the same company, and|i - j| if they belong to different companies.

Print the minimum cost Vladik has to pay to get to the olympiad.

Input
The first line contains three integers n,a, and
b (1 ≤ n ≤ 105,1 ≤ a, b ≤ n) — the number of airports, the id of the airport from which Vladik
starts his route and the id of the airport which he has to reach.

The second line contains a string with length n, which consists only of characters0 and
1. If the i-th character in this string is
0, theni-th airport belongs to first company, otherwise it belongs to the second.

Output
Print single integer — the minimum cost Vladik has to pay to get to the olympiad.

Examples

Input

4 1 4
1010

Output

1

Input

5 5 2
10110

Output

0

Note
In the first example Vladik can fly to the airport 2 at first and pay|1 - 2| = 1 (because the airports belong to different companies), and then fly from the airport2
to the airport 4 for free (because the airports belong to the same company). So the cost of the whole flight is equal to1. It's impossible to get to the olympiad for free, so the answer is equal to1.

In the second example Vladik can fly directly from the airport
5 to the airport 2, because they belong to the same company.

题目大意：

一共有两种飞机场，不同种类的飞机场之间飞行花费为1，相同种类的飞机场之间飞行花费为0.

问从点a到点b的最小花费。

思路：

如果两个飞机场相同，那么花费可定为0.如果两个飞机场不同，那么肯定花费为1，因为不难想到，一定存在相邻的01的情况。那么我们只要找到这个位子，将飞机飞过去即可。

Ac代码：

#include<stdio.h>
#include<string.h>
#include<algorithm>
using namespace std;
char s[100500];
int main()
{
int n,a,b;
while(~scanf("%d%d%d",&n,&a,&b))
{
a--;
b--;
scanf("%s",s);
if(a>b)
{
swap(a,b);
}
if(s[a]==s[b])
{
printf("0\n");
}
else printf("1\n");
}
}