constexpr u32 mul(u32 a,u32 b){
    return u64(a)*b%998244353;
}
constexpr u32 qpw(u32 a,u32 b,u32 r=1){
    for(;b;b>>=1,a=mul(a,a)){
        if(b&1){
            r=mul(r,a);
        }
    }
    return r;
}
constexpr u32 inv(u32 x){
    return qpw(a,998244351);
}

implementer.cpp: In function ‘int main()’:
implementer.cpp:22:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   22 |         scanf("%d", &n);
      |         ~~~~~^~~~~~~~~~
answer.code:1:11: error: ‘u32’ does not name a type
    1 | constexpr u32 mul(u32 a,u32 b){
      |           ^~~
answer.code:4:11: error: ‘u32’ does not name a type
    4 | constexpr u32 qpw(u32 a,u32 b,u32 r=1){
      |           ^~~
answer.code:12:11: error: ‘u32’ does not name a type
   12 | constexpr u32 inv(u32 x){
      |           ^~~