View Compilation Error

0_0_24977674_21167.cpp: In function 'int main()':
0_0_24977674_21167.cpp:14:9: error: 'ss' was not declared in this scope
         ss vis[strlen(a)+2];
         ^
0_0_24977674_21167.cpp:15:16: error: 'vis' was not declared in this scope
         memset(vis,0,sizeof(vis));
                ^