Problem: Example

Input

0 3 1 7 5 9 8 6 4 2
7 0 9 2 1 5 4 8 6 3
4 2 0 6 8 7 1 3 5 9
1 7 5 0 9 8 3 4 2 6
6 1 2 3 0 4 5 9 7 8
3 6 7 4 2 0 9 5 8 1
5 8 6 9 7 2 0 1 3 4
8 9 4 5 3 6 2 0 1 7
9 4 3 8 6 1 7 2 0 5
2 5 8 1 4 3 6 7 9 0


Output

0

Solution (in CPP):

Solution:
#include <bits/stdc++.h>

using namespace std;

int board[10][10];

char getE(string s)
{
  int now = s[0] - '0';
  for(int i = 1; i < s.size(); i++) {
    now = board[now][s[i] - '0'];
  }
  return (now + '0');
}

int main()
{

  for(int i = 0; i < 10; i++) {
    for(int j = 0; j < 10; j++) {
      cin >> board[i][j];
    }
  }

  int ret = 0;

  for(int i = 0; i < 10000; i++) {
    stringstream sss;
    sss << i;
    string s = "0" + sss.str();
    while(s.size() <= 4) s = "0" + s;
    s += getE(s);

    vector< string > kk;
    for(int j = 1; j < 6; j++) {
      for(char c = '0'; c <= '9'; ++c) {
        swap(c, s[j]);
        kk.push_back(s);
        swap(c, s[j]);
      }
      if(j > 1) {
        swap(s[j - 1], s[j]);
        kk.push_back(s);
        swap(s[j - 1], s[j]);
      }
    }
    sort(begin(kk), end(kk));
    kk.erase(unique(begin(kk), end(kk)), end(kk));
    bool f = false;
    for(string& t : kk) {
      if(t == s) continue;
      if(getE(t) == '0') f = true;
    }
    ret += f;
  }
  cout << ret << endl;
}