立志用最少的代碼做最高效的表達

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PAT甲級最優(yōu)題解——>傳送門

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A number that will be the same when it is written forwards or backwards is known as a Palindromic Number. For example, 1234321 is a palindromic number. All single digit numbers are palindromic numbers.

Although palindromic numbers are most often considered in the decimal system, the concept of palindromicity can be applied to the natural numbers in any numeral system. Consider a number N>0 in base b≥2, where it is written in standard notation with k+1 digits a?i?? as ∑?i=0?k?? (a?i?? b?i?? ). Here, as usual, 0≤a?i?? <b for all i and a?k?? is non-zero. Then N is palindromic if and only if a?i?? =a?k?i?? for all i. Zero is written 0 in any base and is also palindromic by definition.
Given any positive decimal integer N and a base b, you are supposed to tell if N is a palindromic number in base b.

Input Specification:
Each input file contains one test case. Each case consists of two positive numbers N and b, where 0<N≤10 ^?9?? is the decimal number and 2≤b≤10 ^?9?? is the base. The numbers are separated by a space.

Output Specification:
For each test case, first print in one line Yes if N is a palindromic number in base b, or No if not. Then in the next line, print N as the number in base b in the form "a?k?? a?k?1?? … a?0?? ". Notice that there must be no extra space at the end of output.

Sample Input 1:
27 2
Sample Output 1:
Yes
1 1 0 1 1

Sample Input 2:
121 5
Sample Output 2:
No
4 4 1

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題意： 給一個十進制數(shù)a，進制b。 要求將a轉(zhuǎn)化為b進制，判斷轉(zhuǎn)化后的數(shù)是否為回文數(shù)。

while+除法+取余求進制數(shù)。存入vector后翻轉(zhuǎn)，比較翻轉(zhuǎn)前后是否相等。

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#include<bits/stdc++.h> using namespace std; int main() {int a, b; cin >> a >> b;vector<int>v1, v2; //存儲翻轉(zhuǎn)前和翻轉(zhuǎn)后的最終結(jié)果while(a) {v1.push_back(a%b);a /= b;}v2 = v1; reverse(v1.begin(), v1.end());cout << (v1==v2 ? "Yes" : "No") << '\n';for(int i = 0; i < v1.size(); i++) {if(i != 0) putchar(' ');cout << v1[i];} return 0; }

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