func_code_string: #include <bits/stdc++.h>   using namespace std;   const int mx = 200, my = 200, tim = 50, mo = 1000000007;   const int d[8][2] = {1, 2, -1, 2, 1, -2, -1, -2, 2, 1, -2, 1, -2, -1, 2, -1};   int x, y, n, bfs[mx * my * 4][2], a[mx * 2][my * 2], i, l, r, xx, yy,       cnt[tim + 10];   long long K;   int main() {     scanf( %I64d%d , &K, &n);     for (i = 1; i <= n; ++i) scanf( %d%d , &x, &y), a[x + mx][y + my] = -1;     a[mx][my] = 1;     bfs[l = r = 1][0] = mx;     bfs[1][1] = my;     while (l <= r) {       x = bfs[l][0];       y = bfs[l++][1];       if (a[x][y] == K + 1 || a[x][y] == tim + 1) break;       for (i = 0; i < 8; ++i) {         xx = x + d[i][0];         yy = y + d[i][1];         if (!a[xx][yy]) {           a[xx][yy] = a[x][y] + 1;           cnt[a[xx][yy]]++;           bfs[++r][0] = xx;           bfs[r][1] = yy;         }       }     }     if (K <= tim || cnt[tim + 1] == 0)       printf( %d n , r);     else {       long long p = K - tim, u = p, v = p + 1;       if (u % 2 == 0)         u /= 2;       else         v /= 2;       printf( %d n ,              (u % mo * (v % mo) % mo * 28 % mo + p % mo * cnt[tim + 1] % mo + r) %                  mo);     }   }   