View Compilation Error

0_0_21003604_20298.cpp: In function 'void dfs(int, int)':
0_0_21003604_20298.cpp:2:3: error: 'v' was not declared in this scope
   v[x][y] = 1;//
   ^
0_0_21003604_20298.cpp:4:18: error: 'di' was not declared in this scope
     int _x = x + di[i];
                  ^
0_0_21003604_20298.cpp:5:18: error: 'dj' was not declared in this scope
     int _y = y + dj[i];
                  ^