0_0_32855534_14515.cpp:1:1: error: 'LL' does not name a type LL exgcd(LL a, LL b, LL &x, LL &y)//拓展欧几里得 ^ 0_0_32855534_14515.cpp:16:1: error: 'LL' does not name a type LL inv(LL a, LL n) ^