zoj1828 Fibonacci Numbers

zoj1828 Fibonacci Numbers

A Fibonacci sequence is calculated by adding the previous two members of the sequence, with the first two members being both 1.

f(1) = 1, f(2) = 1, f(n > 2) = f(n - 1) + f(n - 2)

Your task is to take a number as input, and print that Fibonacci number.

Sample Input

100

Sample Output

354224848179261915075

Note:

No generated Fibonacci number in excess of 1000 digits will be in the test data, i.e. f(20) = 6765 has 4 digits.

结题思路

斐波那契+大数计算
斐波那契采用查表方式
大数计算采用数组进行计算

#include 
#include
#define MAX_NUM 4900  //经测试,第4900个数时,结果位数为1024位
#define MAX_DIGIT 1100  //本题中需保证每一个结果都可以在数组中存储,因此至少为1024
int len_ans;
int table[MAX_NUM][MAX_DIGIT];//菲波那契表
int len_table[MAX_NUM];//菲波那契表中每个数据长度
void ladd(int a[],int len_a,int b[],int len_b,int t){//大数加法,t为表中位置
    int n;
    int i;
    int flag=0;//进位标志
    n=len_afor(i=0;iif(flag=table[t][i]/10) {
            table[t][i] = table[t][i] % 10;
        }
    }
    while(nif(flag=table[t][n]/10){
            table[t][n]=table[t][n]%10;
        }
        n++;
    }
    while(nif(flag=table[t][n]/10){
            table[t][n]=table[t][n]%10;
        }
        n++;
    }
    if(flag){
        table[t][n++]=flag;
    }
    len_ans=n;
}

int main(){
    int n;
    int i,j;
    table[1][0]=1;
    len_table[1]=1;
    table[2][0]=1;
    len_table[2]=1;
    for(i=3;i2],len_table[i-2],table[i-1],len_table[i-1],i);
        len_table[i]=len_ans;
    }
//    for(i=1;i
//        printf("%d--",i);
//        for(j=len_table[i]-1;j>=0;j--){
//            printf("%d",table[i][j]);
//        }
//        printf("\n");
//        printf("%d\n",len_table[i]);
//    }
    while(scanf("%d",&n)!=EOF)
    {
        for(i=len_table[n]-1;i>=0;i--){
            printf("%d",table[n][i]);
        }
        printf("\n");
    }
    return 0;
}

注意:
本题有多个测试用例

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