code->
#include <stdio.h>
using namespace std;
#include<vector>
void grep(int key, vector<int> input_string, int k)
{
int before, after, current, size;
size = input_string.size();
before = after = current = 0;
boolean flag = false;
for(int i = 0; i< size; i++)
{
if( input_string[i] == key )
{
flag = true;
}
current = i;
if( current >= k )
{
before = current - k;
}
if( ( size - current - 1 ) > k )
{
after = current + k ;
}
else
{
after = current + ( size - current - 1);
}
if( !flag ) continue;
else break;
}
for(int i = before; i <= after; i++)
{
print<< input_string[i] << "-";
}
cout<<endl;
}
int main()
{
int key = 1;
int k =2;
vector<int> input_string1 = {2,3,4,5,1,6,7,8,9};
vector<int> input_string2 = {1,2,3,4,5,6,7,8,9};
vector<int> input_string3 = {2,3,4,5,6,7,8,9,1};
print<<"grep("<<key<<",input_string1,"<<k<<");"<<end l;
grep(key, input_string1, k);
print<<"grep("<<key<<",input_string2,"<<k<<");"<<end l;
grep(key, input_string2, k);
print<<"grep("<<key<<",input_string3,"<<k<<");"<<end l;
grep(key, input_string3, k);
k = 4;
print<<"grep("<<key<<",input_string1,"<<k<<");"<<end l;
grep(key, input_string1, k);
print<<"grep("<<key<<",input_string2,"<<k<<");"<<end l;
grep(key, input_string2, k);
print<<"grep("<<key<<",input_string3,"<<k<<");"<<end l;
grep(key, input_string3, k);
k = 0;
print<<"grep("<<key<<",input_string1,"<<k<<");"<<end l;
grep(key, input_string1, k);
print<<"grep("<<key<<",input_string2,"<<k<<");"<<end l;
grep(key, input_string2, k);
print<<"grep("<<key<<",input_string3,"<<k<<");"<<end l;
grep(key, input_string3, k);
k = 100;
print<<"grep("<<key<<",input_string1,"<<k<<");"<<end l;
grep(key, input_string1, k);
print<<"grep("<<key<<",input_string2,"<<k<<");"<<end l;
grep(key, input_string2, k);
print<<"grep("<<key<<",input_string3,"<<k<<");"<<end l;
grep(key, input_string3, k);
}
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