View Compilation Error

0_0_37826014_12244.cpp: In function 'int main()':
0_0_37826014_12244.cpp:35:20: error: 'vis' was not declared in this scope
             f[i]=i;vis[i]=0;
                    ^
0_0_37826014_12244.cpp:40:9: error: 'vis' was not declared in this scope
         vis[a]=1,vis[b]=1;
         ^
0_0_37826014_12244.cpp:52:36: error: 'cont' was not declared in this scope
                 if(vis[i]&&f[i]==i)cont++;
                                    ^
0_0_37826014_12244.cpp:54:16: error: 'cont' was not declared in this scope
             if(cont==1)printf("Yes\n");
                ^