用c仿照第一题解提交却全错，求解问题所在

P1303 A*B Problem

_Persever_ance @ 2024-02-25 20:51:20

#include<stdio.h>
#include<string.h>
int main()
{
    int a[2100] = { 0 }, b[2100] = { 0 }, c[4200] = { 0 };
    int len1 = 0, len2 = 0, i = 0, j = 0, len = 0;
    char a1[2100], b1[2100];
    gets(a1);
    gets(b1);
    len1 = strlen(a1);
    len2 = strlen(b1);
    for (i = 1; i <= len1; i++)
        a[i] = a1[len1 - i] - '0';

    for (i = 1; i <= len2; i++)
        b[i] = b1[len2 - i] - '0';

    for (i = 1; i <=len1; i++)
        for (j = 1; j <=len2; j++)
            c[i+j-1] += a[i] * b[j];

    for (i = 1; i < len1 + len2; i++)
    {
        if (c[i] > 9)
        {
            c[i + 1] += c[i] / 10;
            c[i] %= 10;
        }
    }
    len = len1 + len2;
    while (c[len] == 0 && len > 1)
        len--;
    for (i = len; i >= 1; i--)
        printf("%d", c[i]);
    return 0;
}

by _Persever_ance @ 2024-02-25 20:52:08

这题识别不了c语言输入方式吗

by _buzhidao_ @ 2024-02-25 20:59:37

@Codelover 多测几组样例

by nlhzh1818 @ 2024-02-25 21:10:46

python(就这么简单):


import sys
sys.set_int_max_str_digits(10000)
num=int(input())
num2=int(input())
print(num*num2)

by zjh114514 @ 2024-02-25 21:15:18

@Codelover 为什么你这代码会输出 -

by zjh114514 @ 2024-02-25 21:22:45

@Codelover int 换成 long 试下？

by Super_Cube @ 2024-02-25 21:35:21

@Codelover 虽然不知道为什么，但是把 gets 换成 scanf 就过了。

before：

gets(a1);
gets(b1);

after：

scanf("%s%s",a1,b1);

by Super_Cube @ 2024-02-25 21:37:57

@Codelover 哦我好像知道了，可能是数据造的不规范，比如说行末有多余空格啥的。

by _Persever_ance @ 2024-02-25 22:14:02

@Super_Cube 确实如此，谢谢佬不然要憋死了

by w_moon @ 2024-04-16 21:07:30

@_Persever_ance gets好像不能用

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