View Compilation Error

0_0_33904169_8165.cpp:19:9: error: '_int64' does not name a type
 typedef _int64 LL;
         ^
0_0_33904169_8165.cpp:34:1: error: 'LL' does not name a type
 LL mod =998244353;
 ^
0_0_33904169_8165.cpp:35:1: error: 'LL' does not name a type
 LL QPow(LL a, LL b) { LL ans = 1; while (b) { if (b & 1)ans = ans * a; a = a * a; b >>= 1; }return ans; }
 ^
0_0_33904169_8165.cpp:61:1: error: 'LL' does not name a type
 LL gcd(LL x, LL y)
 ^
0_0_33904169_8165.cpp:95:17: error: 'LL' was not declared in this scope
 string toString(LL a)
                 ^
0_0_33904169_8165.cpp:96:1: error: expected ',' or ';' before '{' token
 {
 ^