uva 10494 - If We Were a Child Again

这道题给的数据非常重要 ? 只要注意到了不用大数的除法都可以做 ??

因为除数是有限大的 ?用整形就能保存下来 ? ?然后就简单了 模拟四则运算 ? 很容易就能做出来了 ? ?取模也是一样的

字符串的比较函数用着老错 ?自己写了一个

下面看代码

#include<cstdio>
#include<cstring>
#define MAX 1000000
#define LL long long
char str[MAX],result[MAX];

void Mod(char *s)
{
    int  str_len = strlen(str);
    int  s_len = strlen(s);
    LL c = 0;
    for(int  i = 0; i < s_len; i++)
        c =c*10+(s[i]-'0');
    LL sum = 0;
    for(int i = 0; i < str_len; i++)
    {
        sum = sum*10 + (str[i] - '0');
        if(sum >= c) sum %= c;
    }
    printf("%lldn",sum);
}

int cmp(char *p,char *q)
{
    if(strlen(p)<strlen(q))return 1;
    if(strlen(p)>strlen(q))return 0;
    for(int i = 0; i < strlen(q); i++)
        if(p[i] > q[i])return 0;
        else if(p[i] < q[i])return 1;
    return 0;
}

void Division(char *s)
{
    int  str_len = strlen(str);
    int  s_len = strlen(s);
    LL c = 0;
    for(int  i = 0; i < s_len; i++)
        c =c*10+(s[i]-'0');
    LL sum = 0;
    int flag = 0;
    for(int i = 0; i < str_len; i++)
    {
        sum = sum*10 + (str[i] - '0');
        if(sum >= c)
        {
            flag = 1;
            printf("%lld",sum/c);
            sum %=c;
        }
        else if(flag) printf("0");
    }
    printf("n");
}

int main()
{
    #ifdef LOCAL
    freopen("in.txt","r",stdin);
    #endif // LOCAL
    char sign,c[15];
    while(scanf("%s %c %s",str,&sign,c)!=EOF)
    {
        if(sign == '%')
        {
            if(cmp(str,c)){puts(str);continue;}
            if(strcmp(str,c)==0){printf("0n");continue;}
            Mod(c);
        }
        else
        {
            if(cmp(str,c)){printf("0n");continue;}
            if(strcmp(str,c) == 0){printf("1n");continue;}
            Division(c);
        }
    }
    return 0;
}