链接:https://codeforces.com/contest/525/problem/B
Pasha got a very beautiful string s for his birthday, the string consists of lowercase Latin letters. The letters in the string are numbered from 1 to |s| from left to right, where |s| is the length of the given string.
Pasha didn't like his present very much so he decided to change it. After his birthday Pasha spent m days performing the following transformations on his string — each day he chose integer ai and reversed a piece of string (a segment) from position ai to position |s| - ai + 1. It is guaranteed that 2·ai ≤ |s|.
You face the following task: determine what Pasha's string will look like after m days.
Input
The first line of the input contains Pasha's string s of length from 2 to 2·105 characters, consisting of lowercase Latin letters.
The second line contains a single integer m (1 ≤ m ≤ 105) — the number of days when Pasha changed his string.
The third line contains m space-separated elements ai (1 ≤ ai; 2·ai ≤ |s|) — the position from which Pasha started transforming the string on the i-th day.
Output
In the first line of the output print what Pasha's string s will look like after m days.
Examples
input
Copy
abcdef 1 2
output
Copy
aedcbf
input
Copy
vwxyz 2 2 2
output
Copy
vwxyz
input
Copy
abcdef 3 1 2 3
output
Copy
fbdcea
代码:
#include<bits/stdc++.h>
using namespace std;
long long a[2000000]={0};
long long n,t,b;
string s;
int main()
{
cin>>s;
cin>>t;
while(t--)
{
cin>>b;
if(!a[b])
{
a[b]=1;
}
else
{
a[b]++;
}
}
int sum=0;
for(int i=0;i<s.length()/2;i++)
{
sum+=a[i+1];
if(sum&1)
swap(s[i],s[s.length()-1-i]);
}
cout<<s<<endl;
}