题解

第19行都压缩成PY了

#include<cstdio>
inline int read(){
    int x=0,c;
    while((c=getchar_unlocked())<'0');
    do x=x*10+c-'0';
    while((c=getchar_unlocked())>='0');
    return x;
}inline void write(int n) {
    if(n<0) {
        putchar('-');
        n*=-1;
    }if(n>=10){
        write(n/10);
    }putchar(n%10+'0');
}int fib(int x){
    if(x<=2)return 1;
    return fib(x-1)+fib(x-2);
}int main(){
    write(fib(read()));
}