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小弟在資訊作業上遇到了一點困難

還請各位大大們協助解惑

謝謝

以下是問題

在費氏數列.c中第18,19,20行可否刪除?不論可否都要詳述為什麼?
if(n==1||n==2)
return 1; //使費式數列的頭兩個數為1
else

以下為費氏數列.c

#include <stdio.h>
#include<stdlib.h>

long long f(int,long long [ ]); //定義一個函數
int main(void)
{
long long cache[50]={0,1,1}; //定義陣列
int n;
scanf("%d",&n); //第幾個費氏數
printf("f(%d) = %I64d\n",n,f(n,cache)); //呼叫函數並印出其值
system("pause");
return 0;
}

long long f(int n,long long cache[ ])
{
if(cache[n]==0)
if(n==1||n==2)
return 1; //使費式數列的頭兩個數為1
else
cache[n] = f(n-1,cache) + f(n-2,cache); //再次呼叫此函數

return cache[n];
}

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