View Compilation Error

0_0_18192990_10625.cpp: In function 'int main()':
0_0_18192990_10625.cpp:105:30: error: 'dir' was not declared in this scope
                     int xx=i+dir[k][0], yy=j+dir[k][1];
                              ^
0_0_18192990_10625.cpp:106:32: error: 'yy' was not declared in this scope
                     if(xx<0 || yy<0 || xx>=n || yy>=n) continue;
                                ^
0_0_18192990_10625.cpp:107:50: error: 'yy' was not declared in this scope
                     dinic.addEdge(h(i, j), h(xx, yy), 1);
                                                  ^