
在这里,我们将看到一个与给定字符串的字母数字缩写相关的有趣问题。字符串长度小于10。我们将打印出所有的字母数字缩写。
字母数字缩写是由字符和数字混合形成的。该数字的值是被省略的字符数。可能有任意数量的被省略的子字符串。没有两个子字符串是相邻的。让我们看一下获取这个概念的算法。
算法
printAbbreviation(s, index, max, str) −
begin if index is same as max, then print str end if add s[index] at the last of str printAbbreviation(s, index + 1, max, str) delete last character from str count := 1 if str is not empty, then if the last character of str is a digit, then add last digit with the count value delete last character from str end if end if add count after the str printAbbreveation(s, index + 1, max, str)end
示例
#include using namespace std;void printAbbreviation(const string& s, int index, int max_index, string str) { if (index == max_index) { //if string has ended cout << str << endl; return; } str.push_back(s[index]); // push the current character to result printAbbreviation(s, index + 1, max_index, str); //print from next index str.pop_back(); //remove last character int count = 1; if (!str.empty()) { if (isdigit(str.back())) { //if the last one is digit, then count += (int)(str.back() - '0'); //count the integer value of that digit str.pop_back(); //remove last character } } char to_char = (char)(count + '0'); //make count to character str.push_back(to_char); printAbbreviation(s, index + 1, max_index, str); //do for next index}void printCombination(string str) { if (!str.length()) //if the string is empty return; string str_res; printAbbreviation(str, 0, str.length(), str_res);}int main() { string str = "HELLO"; printCombination(str);}
输出
HELLOHELL1HEL1OHEL2HE1LOHE1L1HE2OHE3H1LLOH1LL1H1L1OH1L2H2LOH2L1H3OH41ELLO1ELL11EL1O1EL21E1LO1E1L11E2O1E32LLO2LL12L1O2L23LO3L14O5
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