View Compilation Error

0_0_20449211_10993.cpp: In function 'int bfs(int, int)':
0_0_20449211_10993.cpp:22:9: error: 'i' was not declared in this scope
     vis[i][j] = 1;
         ^
0_0_20449211_10993.cpp:22:12: error: 'j' was not declared in this scope
     vis[i][j] = 1;
            ^