View Compilation Error

0_0_35987682_15268.cpp: In function 'int main()':
0_0_35987682_15268.cpp:65:15: error: 'm' was not declared in this scope
   if(sg[x]^sg[m]^sg[p]){//sg函数性质
               ^
0_0_35987682_15268.cpp:65:21: error: 'p' was not declared in this scope
   if(sg[x]^sg[m]^sg[p]){//sg函数性质
                     ^