View Compilation Error

0_0_30129749_18749.cpp:13:1: error: invalid use of template-name 'std::vector' without an argument list
 vector unio[maxn];
 ^
0_0_30129749_18749.cpp: In function 'void init()':
0_0_30129749_18749.cpp:22:3: error: 'unio' was not declared in this scope
   unio[i].clear();
   ^
0_0_30129749_18749.cpp: In function 'void tarjan(int)':
0_0_30129749_18749.cpp:47:13: error: 'unio' was not declared in this scope
             unio[cnt].push_back(top);
             ^