View Compilation Error

0_0_35956525_22737.cpp: In function 'int main()':
0_0_35956525_22737.cpp:311:8: error: 'ui' was not declared in this scope
    if (ui == vj)
        ^
0_0_35956525_22737.cpp:311:14: error: 'vj' was not declared in this scope
    if (ui == vj)
              ^
0_0_35956525_22737.cpp:313:13: error: 'vi' was not declared in this scope
    else if (vi == uj)
             ^
0_0_35956525_22737.cpp:313:19: error: 'uj' was not declared in this scope
    else if (vi == uj)
                   ^