救救孩子吧，一直过不了，不知道哪里错了

fufuQAQ @ 2022-03-01 23:40:50

#include<bits/stdc++.h>
#define ll long long 
using namespace std;
const int N=5010;
int f[N];//记录次数 

int fac(int n)
{
    if(n==1||n==2) return f[n]=1;
    if(f[n]!=0)  return f[n]; 
//  return fac(n-1)+fac(n-2);   
    else return f[n]=fac(n-1)+fac(n-2); 
} 

int main()
{
    int n;
    cin>>n;
    cout<<fac(n);
    return 0;
}

by AC_CSP @ 2022-03-02 07:35:04

else return f[n]=fac(n-1)+fac(n-2)

这里后面这个表达式为1啊，应该分两步写

f[n]=fac(n-1)+fac(n-2); return f[n];

by Beyond_Heaven @ 2022-03-02 08:38:42

@AC_CSP 你在说__,学下C++罢

by Beyond_Heaven @ 2022-03-02 08:39:35

@zhejianguniversity 这题需要python

by AC_CSP @ 2022-03-02 09:34:59

@Beyond_Heaven

跟python有啥关系？赋值语句默认返回1

by AC_CSP @ 2022-03-02 09:36:38

主要是高精，我的意思是算法...

by AC_CSP @ 2022-03-02 09:37:23

@Beyond_Heaven

by YuzhenQin @ 2022-03-02 09:47:55

@AC_CSP 可以这么写吧

by YuzhenQin @ 2022-03-02 09:52:36

@AC_CSP Assignment Operators

All built-in assignment operators return this, and most user-defined overloads also return this so that the user-defined operators can be used in the same manner as the built-ins. However, in a user-defined operator overload, any type can be used as return type (including void).

by Beyond_Heaven @ 2022-03-02 09:53:19

@AC_CSP 这边请问一下平时有使用电脑编程的习惯吗

by Retired_lvmao @ 2022-03-02 09:55:30

@AC_CSP

你是不是没见过 printf("%d\n",lastans=ans) 之类的写法。