View Compilation Error

0_0_22258827_1286.cpp:25:1: error: 'queu1' does not name a type
 queu1<int> Q;
 ^
0_0_22258827_1286.cpp: In function 'bool spfa(int)':
0_0_22258827_1286.cpp:75:13: error: 'Q' was not declared in this scope
     while (!Q.empty())
             ^
0_0_22258827_1286.cpp:78:5: error: 'Q' was not declared in this scope
     Q.push(s);
     ^