View Compilation Error

0_0_39648017_7287.cpp:55:1: error: 'vector' does not name a type
   55 | vector<blk>vc[2];
      | ^~~~~~
0_0_39648017_7287.cpp: In function 'void solve(int)':
0_0_39648017_7287.cpp:74:9: error: 'vc' was not declared in this scope
   74 |         vc[0].clear(),vc[1].clear();
      |         ^~