View Compilation Error

0_0_30106037_745.cpp:6:9: error: 'N' was not declared in this scope
 int vis[N][N];
         ^
0_0_30106037_745.cpp:6:12: error: 'N' was not declared in this scope
 int vis[N][N];
            ^
0_0_30106037_745.cpp: In function 'int bfs(int, int)':
0_0_30106037_745.cpp:21:12: error: 'vis' was not declared in this scope
     memset(vis,0,sizeof(vis));
            ^
0_0_30106037_745.cpp:36:13: error: return-statement with no value, in function returning 'int' [-fpermissive]
             return;
             ^