View Compilation Error

0_0_33374853_6932.cpp: In function 'int main()':
0_0_33374853_6932.cpp:58:68: error: 'a' was not declared in this scope
   for ( int i = 1, u, v; i <= m; ++ i ) scanf ( "%d %d", &u, &v ), a
                                                                    ^
0_0_33374853_6932.cpp:58:68: error: expected '}' at end of input
0_0_33374853_6932.cpp:58:68: error: expected '}' at end of input