View Compilation Error

0_0_24427075_24903.cpp:20:13: error: variable or field 'Matmul' declared void
 void Matmul(LL X[MAXN][MAXN],LL Y[MAXN][MAXN])  
             ^
0_0_24427075_24903.cpp:20:13: error: 'LL' was not declared in this scope
0_0_24427075_24903.cpp:20:30: error: 'LL' was not declared in this scope
 void Matmul(LL X[MAXN][MAXN],LL Y[MAXN][MAXN])  
                              ^