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## Discussion of Problem 1197. Lonesome Knight

Posted by prime 5 Aug 2016 17:46
#include <stdio.h>
#include <iostream>
using namespace std;
int main()
{
int n, m, i;
char l, dt;
cin>>n;
for(i=0;i<n;i++){

cin>>l>>dt;
if(l=='a' && dt=='1' ||l=='a' && dt=='8' ||l=='h' && dt=='1' ||l=='h' && dt=='8')
{
m=2;
cout<<m<<endl;
}
if(l=='a' && dt=='2' ||l=='a' && dt=='7' ||l=='b' && dt=='1' ||l=='b' && dt=='8' ||l=='g' && dt=='1'||l=='g' && dt=='8'||l=='h' && dt=='2'||l=='h' && dt=='7')
{
m=3;
cout<<m<<endl;
}
if(l=='a' && dt=='3' ||l=='a' && dt=='4' ||l=='a' && dt=='5' ||l=='a' && dt=='6' ||l=='b' && dt=='2'||l=='b' && dt=='7'||l=='c' && dt=='1'||l=='d' && dt=='1'||l=='e' && dt=='1'||l=='f' && dt=='1'||l=='c' && dt=='8'||l=='d' && dt=='8'||l=='e' && dt==8||l=='f' && dt=='8'||l=='g' && dt=='7'||l=='g' && dt=='2'||l=='h' && dt=='3'||l=='h' && dt=='4'||l=='h' && dt=='5'||l=='h' && dt=='6')
{
m=4;
cout<<m<<endl;
}
if(l=='b' && dt=='3' ||l=='b' && dt=='4' ||l=='b' && dt=='5' ||l=='b' && dt=='6' ||l=='c' && dt=='2' ||l=='d' && dt=='2' ||l=='e' && dt=='2' ||l=='f' && dt=='2' ||l=='c' && dt=='7' ||l=='d' && dt=='7'||l=='e' && dt=='7'||l=='f' && dt=='7'||l=='g' && dt=='3'||l=='g' && dt=='4'||l=='g' && dt=='5'||l=='g' && dt=='6')
{
m=6;
cout<<m<<endl;
}
if(l=='c' && dt=='3' ||l=='c' && dt=='4' ||l=='c'&& dt=='5' ||l=='c' && dt=='6' ||l=='d' && dt=='3' ||l=='d' && dt=='4' ||l=='d' && dt=='5' ||l=='d' && dt=='6' ||l=='e' && dt=='3' ||l=='e' && dt=='4' ||l=='e' && dt=='5' ||l=='e' && dt=='6' ||l=='f' && dt=='3' ||l=='f' && dt=='4' ||l=='f' && dt=='5' ||l=='f' && dt=='6')
{
m=8;
cout<<m<<endl;
}
}
return 0;
}

I checked all values but something is wrong... That works on my IDE...
Sorry, i am noob but this solution must work fine!
Posted by Oleg Baskakov 5 Aug 2016 22:47
This is bad, you shouldn't code this way. What if chessboard was 1000x1000 instead of 8x8? Check out this link http://acm.timus.ru/forum/thread.aspx?id=32538&upd=635922147004042008
A test_horse function from there is more universal and it can check the amount of moves from any given x and y. You should use something like that instead. Otherwise it's very hard to tell where the error is.
Posted by falicos 5 Aug 2016 23:07
this cod is very hard to check. I make the folowing program
for(l='a'; l<='h';l++){
for(dt='1';dt<='8';dt++){
____________________________
this is your cod
only replace
cout<<m<<endl;
with this one
cout<<m<<' ';
_____________________________
}
cout<<endl;
}
2,3,4,4,4,4,3,2,
3,4,6,6,6,6,4,3,
4,6,8,8,8,8,6,4,
4,6,8,8,8,8,6,4,
4,6,8,8,8,8,6,
4,6,8,8,8,8,6,4
3,4,6,6,6,6,4,3,
2,3,4,4,4,4,3,2
with the write answer
2,3,4,4,4,4,3,2,
3,4,6,6,6,6,4,3,
4,6,8,8,8,8,6,4,
4,6,8,8,8,8,6,4,
4,6,8,8,8,8,6,4,
4,6,8,8,8,8,6,4,
3,4,6,6,6,6,4,3,
2,3,4,4,4,4,3,2
It is evident that you miss one case e8. I add this case in the branch where m=4,and AC. And even if chessboard was 1000x1000 the best solution is precalc. Good luck.

Edited by author 05.08.2016 23:08

Edited by author 05.08.2016 23:11

Edited by author 05.08.2016 23:14

Edited by author 05.08.2016 23:19