淘宝笔试题及答案

/*淘宝笔试题：给定一个字符串， 比如"我爱alibaba", 写个函数截取字符串， 比如：我截取前5个字节， 为 “我爱a”， 接3个字节， 就是 “我爱", 半个汉字的就必须截取完*/#include <string>#include <iostream>char* subString(const char* str, int nSubLength){if (str == nullptr) return nullptr;int nLength = strlen(str);if (nLength < nSubLength) return nullptr;char ch;bool bMatch = true;for (int nIndex = 0; nIndex < nSubLength; ++nIndex){ch = str[nIndex];if (ch < 0 || ch > 255) //双字节{bMatch = !bMatch;}}char* p = nullptr;if (bMatch == false){p = new char[nSubLength + 2];memcpy(p, str, nSubLength + 1);p[nSubLength + 1] = '/0';}else{p = new char[nSubLength + 1];memcpy(p, str, nSubLength);p[nSubLength] = '/0';}std::cout<<p<<std::endl;return p;}void test(){const char* str = "阿里only巴巴";subString(str, 3);subString(str, 4);subString(str, 5);subString(str, 6);subString(str, 8);subString(str, 9);subString(str, 10);subString(str, 11);subString(str, 12);}