View Compilation Error

0_0_21382251_11057.cpp:44:13: error: redefinition of 'int vis [1050]'
 int vis[maxn];
             ^
0_0_21382251_11057.cpp:41:29: note: 'int vis [1050]' previously declared here
 int dfn[maxn],low[maxn],dex,vis[maxn];
                             ^
0_0_21382251_11057.cpp: In function 'void tarjan(int, int)':
0_0_21382251_11057.cpp:48:9: error: 'i' was not declared in this scope
     vis[i]=1;
         ^