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View Compilation Error

0_0_35163971_24788.cpp: In function 'void init()':
0_0_35163971_24788.cpp:29:9: error: 'vis' was not declared in this scope
  memset(vis,false,sizeof(vis));
         ^
0_0_35163971_24788.cpp:30:9: error: 'inz' was not declared in this scope
  memset(inz,false,sizeof(inz));
         ^
0_0_35163971_24788.cpp: In function 'void tarjan(int)':
0_0_35163971_24788.cpp:36:2: error: 'vis' was not declared in this scope
  vis[st]=inz[st]=true;
  ^
0_0_35163971_24788.cpp:36:10: error: 'inz' was not declared in this scope
  vis[st]=inz[st]=true;
          ^
0_0_35163971_24788.cpp:41:31: error: 'min' was not declared in this scope
    low[st]=min(low[st],low[to]);
                               ^
0_0_35163971_24788.cpp:42:48: error: 'min' was not declared in this scope
   }else if(inz[to]) low[st]=min(low[st],dep[to]);
                                                ^
0_0_35163971_24788.cpp:49:4: error: 'f' was not declared in this scope
    f[k]++;
    ^
0_0_35163971_24788.cpp: In function 'int main()':
0_0_35163971_24788.cpp:65:8: error: 'vis' was not declared in this scope
    if(!vis[i]) tarjan(i);
        ^


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