问题 H: 乾隆巡江南
时间限制: 2 Sec 内存限制: 128 MB
提交: 13 解决: 3
[提交][状态][讨论版]
题目描述
话说乾隆带着他的宰相刘罗锅和你出巡江南,被杭州城府邀请去听戏,至于什么戏,那就不知了。乾隆很高兴,撒酒与君臣共享。三更欲回住处,可是乾隆这人挺怪,他首先要到西湖边散散步,而且命令不准有人跟着他。 小醉,步于西湖岸,停于断桥前,突闻琴声悠悠,歌儿婉婉。这乐曲不哀伤不愁怅,少了一分怨女的羁绊,多了一分少女的期盼。乾隆走上前去,视其背影,为一女子手抚古琴,悠悠而唱。可是这么晚了,小女怎么还不回家呢,莫非是她起早床?乾隆走上前去,小声问道:“伊为何未宿?”,小女沉默片刻,转身而来。顿时,顿时,顿时!!!!!乾隆惊呆了!!!!哇!!!!噻!!!!!!这人,这伊!!!!原来!!!!!!!不是一个美女(狂汗ing)。小女并未回答她的话,只是与乾隆侃了侃诗。乾隆兴哉,问其曰:“不知偶能助伊否?”,小女曰:“偶无所以助,且有一事相求,愿君能解之。” 乾隆一看,立刻晕到在地,片刻而起,曰:“明日必解之”,且去。 回到家中,乾隆夜召你“入寝”,曰:“如此姑娘,如此情调,如此罗曼蒂克,竟然丢一个如此煞风景之问”,一边发气,一边把这个问题交给你。你一看,顿然发现,原来是用蝌蚪文写的: Problems involving the computation of exact values of very large magnitude and precision are common. For example, the computation of the national debt is a taxing experience for many computer systems. This problem requires that you write a program to compute the exact value of Rn where R is a real number ( 0.0 < R < = 9999.9) and n is an integer such that 0 < n < = 200. 此时的你,已经是皇帝身边的小太监,自然有必要为皇上解决此题。
输入
The input will consist of a set (less than 11) of pairs of values for R and n. The R value will occupy columns 1 through 6, and the n value will be in columns 8 and 9.
输出
The output will consist of one line for each line of input giving the exact value of R^n. Leading zeros should be suppressed in the output. Insignificant trailing zeros must not be printed. Don't print the decimal point if the result is an integer.
样例输入
95.123 2
0.4321 5
5.1234 7
6.7592 3
98.999 5
1.0100 10
样例输出
9048.385129
.01506334182914325601
92663.3181348508776705891407804544
308.806114738688
9509420210.697891990494999
1.10462212541120451001 题目意思就是说,算R的n次方,整数部分全是零的话不要输出0(如例2),小数最后的0也不用输出来,例如0.100只需输出.1即可,若答案是整数,不用输出小数点
#include <iostream>
#include <string>
#include <cstring>
#include <algorithm>
using namespace std;
int main()
{
char a1[];
int a[];
int b[];
int c[];
int n;
while (cin >> a1 >> n)
{
memset(a, , sizeof(a));
memset(b, , sizeof(b));
memset(c, , sizeof(c));
int l = strlen(a1);
int k=-, j, i;//k一开始初始化为-1,为了辨别输进来的是小数还是整数
for (i = ; i < l; i++)
{
if (a1[i] == '.')
{//是小数的话,先把"."去了
k = i;
for (j = i; j < l; j++)
{
a1[j] = a1[j + ];//小数点后的几位都向前移一位
}
k = l - k - ;//k用来标记第几位应该有小数
break;
}
}
if (k != -)
{//输进来是小数的话
for (i = ; i <= l - ; i++)
{
a[l - - i] = a1[i] - '';
b[l - - i] = a1[i] - '';
}
l--;
}
else
{//是整数的话
for (i = ; i <= l - ; i++)
{
a[l - i] = a1[i] - '';//倒的存入a数组
b[l - i] = a1[i] - '';
}
} int lc = l;
int x;
int nn = n - ;
while (nn--)
{
for (i = ; i <= l; i++)//这里是l
{
x = ;
for (j = ; j <= lc; j++)//这里是lc,别弄反了,一开始我就反了
{//乘法运算
c[i + j - ] = a[i] * b[j] + x + c[i + j - ];//当前位=乘机+进的位+当前位
x = c[i + j - ] / ;
c[i + j - ] = c[i + j - ] % ;
}
c[lc + i] = x;
}
lc = l + lc;
for (i = ; i <= lc; i++)
{
b[i] = c[i];
}
memset(c, , sizeof(c));
}
if (k == -)
{//整数的情况
while (b[lc] == && lc>) lc--;//删除前导零
for (i = lc; i >= ; i--) cout << b[i];
cout << endl;
}
else
{//小数的情况 bool f = ;
for (i = lc; i >= n * k + ; i--)//n*k这个位置要放‘.’
{//先输出整数部分
if (b[i] == && f == ) continue;
else if (b[i] != ) { f = ; cout << b[i]; }
else cout << b[i];
}
f = ;
int pp = ;
for (i = ; i <= n * k; i++)
{
if (b[i] == && f == ) continue;
else if (b[i] != && f == ) { f = ; pp = i; break; }
}
if (i != n * k + )//i==n*k+1时,代表小数位全是0,不需要输出‘.’
{
cout << ".";
for (i = n * k; i >= pp; i--) cout << b[i];
}
cout << endl;
}
}
return ;
}