View Compilation Error

0_0_37525472_5005.cpp: In function 'void build()':
0_0_37525472_5005.cpp:36:9: error: invalid operands of types 'int [26]' and 'int' to binary 'operator|'
   tr[u] |= st[fail[u]];
         ^
0_0_37525472_5005.cpp:36:9: error:   in evaluation of 'operator|=(int [26], int)'