View Compilation Error

0_0_24230815_499.cpp: In function 'void dijkstra(int, int)':
0_0_24230815_499.cpp:20:5: error: expected initializer before 'memset'
     memset(vis,0,sizeof(vis));
     ^
0_0_24230815_499.cpp:24:5: error: 'vis' was not declared in this scope
     vis[v]=1;
     ^