View Compilation Error

0_0_33530980_26222.cpp:8:1: error: 'int8_t' does not name a type
 int8_t mu[MAXN + 1];
 ^
0_0_33530980_26222.cpp: In function 'void euler()':
0_0_33530980_26222.cpp:13:5: error: 'mu' was not declared in this scope
     mu[1] = 1;
     ^
0_0_33530980_26222.cpp: In function 'int main()':
0_0_33530980_26222.cpp:52:38: error: 'mu' was not declared in this scope
                 ans = (ans+ 1ll*(mod+mu[i])*(inv[i]-inv[i-1]+mod)%mod*inv[n/i])%mod;
                                      ^