View Compilation Error

0_0_24953391_22471.cpp: In function 'void dijk(ll)':
0_0_24953391_22471.cpp:40:13: error: 'vis' was not declared in this scope
          if(vis[xx])
             ^
0_0_24953391_22471.cpp:42:9: error: 'vis' was not declared in this scope
         vis[xx]=1;
         ^