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  1. #include<iostream>
  2. #include<stdio.h>
  3. #include<stdlib.h>
  4. using namespace std;
  5.  
  6. int n,cols,empty,board[10][10],sum=0,hi;
  7.  
  8. void set(int i,int j,int count){
  9.     if(i<0 || i>=10 || j<0 || j>=10 || board[i][j] == 0)
  10.         return;
  11.     int ans = 0;
  12.     board[i][j] = 0;//unsets the (i,j) cell
  13.     hi = max(hi,count+1);//hi stores the maximum of value of visited squares
  14.     //try all 8 possible moves for knight
  15.     set(i-1,j-2,count+1);
  16.     set(i-2,j-1,count+1);
  17.     set(i+1,j-2,count+1);
  18.     set(i+2,j-1,count+1);
  19.     set(i-1,j+2,count+1);
  20.     set(i-2,j+1,count+1);
  21.     set(i+1,j+2,count+1);
  22.     set(i+2,j+1,count+1);
  23.     board[i][j] = 1;//sets (i,j) cell again(backtracking)
  24. }
  25. int main(){
  26. //    freopen("input.txt","r",stdin);
  27.  
  28.     cin>>n;
  29.     sum = 0;
  30.  
  31.     for(int i=0;i<n;i++){
  32.         for(int j=0;j<n;j++){
  33.             cin>>board[i][j];
  34.             if(board[i][j])
  35.                 sum++; // sum stroes total number of valid cells on chessboard
  36.         }
  37.     }
  38.     hi=0;
  39.     set(0,0,0);
  40.     cout<<sum-hi<<"\n";
  41.     return 0;
  42. }
Success #stdin #stdout 0s 4496KB
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stdin 
Standard input is empty
stdout 
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https://ideone.com/75pYPi
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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