萌新求问，为什么这个代码在我本地有概率运行不完

//#pragma GCC optimize(2,3)
#include<bits/stdc++.h>
#define int long long
#define il inline
#define pii pair<int,int>
#define mk make_pair
#define fir first
#define sec second
#define pb emplace_back
#define put putchar
using namespace std;
il int rd(){
    int jya=0,tl=1;char jyt=getchar();
    while(!isdigit(jyt)){if(jyt=='-')tl=-1;jyt=getchar();}
    while(isdigit(jyt)){jya=(jya<<1)+(jya<<3)+(jyt-'0');jyt=getchar();}
    return jya*tl;
}
il void wr(int jjy){
    if(jjy<0)putchar('-'),jjy=-jjy;
    if(jjy>9)wr(jjy/10);
    putchar(jjy%10+48);
}
const int JYAAKIOI=1e18,N=5e5+10,M=3e6+10;
signed main(){
	put('D');
    return 0;
}