func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string c =   ;     string t =   ;     cin >> t >> c;     char lt = t[0];     int nt = int(t[1]) - 48;     char lc = c[0];     int nc = int(c[1]) - 48;     int cnt = 16;     vector<pair<char, int> > torre;     vector<pair<char, int> > caballo;     for (int i = -2; i <= 2; i += 4) {       for (int j = -1; j <= 1; j += 2) {         char x = lt + i;         int y = nt + j;         char xx = lt + j;         int yy = nt + i;         if (int(x) < 105 && int(x) > 96 && y < 9 && y > 0) {           cnt++;           torre.push_back(make_pair(x, y));         }         if (int(xx) < 105 && int(xx) > 96 && yy < 9 && yy > 0) {           cnt++;           torre.push_back(make_pair(xx, yy));         }       }     }     for (int i = -2; i <= 2; i += 4) {       for (int j = -1; j <= 1; j += 2) {         char x = lc + i;         int y = nc + j;         char xx = lc + j;         int yy = nc + i;         if (int(x) < 105 && int(x) > 96 && y < 9 && y > 0 && x != lt && y != nt) {           cnt++;           caballo.push_back(make_pair(x, y));         }         if (int(xx) < 105 && int(xx) > 96 && yy < 9 && yy > 0 && xx != lt &&             yy != nt) {           cnt++;           caballo.push_back(make_pair(xx, yy));         }       }     }     for (int i = 0; i < torre.size(); i++) {       for (int j = 0; j < caballo.size(); j++) {         if (torre[i].first == caballo[j].first &&             torre[i].second == caballo[j].second)           cnt--;       }     }     cout << 64 - cnt <<   n ;     return 0;   }   