立志用最少的代碼做最高效的表達

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PAT甲級最優題解——>傳送門

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People in Mars represent the colors in their computers in a similar way as the Earth people. That is, a color is represented by a 6-digit number, where the first 2 digits are for Red, the middle 2 digits for Green, and the last 2 digits for Blue. The only difference is that they use radix 13 (0-9 and A-C) instead of 16. Now given a color in three decimal numbers (each between 0 and 168), you are supposed to output their Mars RGB values.

Input Specification:
Each input file contains one test case which occupies a line containing the three decimal color values.

Output Specification:
For each test case you should output the Mars RGB value in the following format: first output #, then followed by a 6-digit number where all the English characters must be upper-cased. If a single color is only 1-digit long, you must print a 0 to its left.

Sample Input:
15 43 71

Sample Output:
#123456

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簡單進制處理，水題。 因此重心轉化為如何優化代碼結構和效率。 具體見實現代碼。

注意大寫字母和前導0

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#include<bits/stdc++.h> using namespace std;char a[13] = {'0','1','2','3','4','5','6','7','8','9','A','B','C'};string redix(int n) {string s;while(n) {s += a[n%13];n /= 13;}reverse(s.begin(),s.end());return s; } int main() {putchar('#');for(int i = 0; i < 3; i++) {int a; cin >>a; cout << setfill('0') << setw(2) << redix(a);}return 0 ; }

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耗時：

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痛苦難道是白忍受的嗎？他應該使我們偉大！??????——托馬斯·曼

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