View Compilation Error

0_0_32959418_15305.cpp: In function 'void build2(int, int)':
0_0_32959418_15305.cpp:94:30: error: 'par' was not declared in this scope
     a[parent].l = a[son].l,a[par
                              ^
0_0_32959418_15305.cpp:94:30: error: expected ']' at end of input
0_0_32959418_15305.cpp:94:30: error: expected '}' at end of input