```cpp #include <iostream> #include <string> #include <vector> // 计算字符串 s 字典序最大的子序列 std::string maxSubsequence(const std::string& s) { std::string result; int count[26] = {0}; for (char c : s) { count[c - 'a']++; } for (int i = 25; i >= 0; i--) { for (int j = 0; j < count[i]; j++) { result += 'a' + i; } } return result; } // 分割字符串 s 为 k 段，并返回字典序最小的权值 std::string minWeightSplit(const std::string& s, int k) { std::vector<std::string> segments; int start = 0; for (int i = 0; i < k - 1; i++) { int end = start; std::string bestSeg; for (int j = start; j <= s.size() - (k - i); j++) { std::string seg = s.substr(start, j - start + 1); std::string maxSub = maxSubsequence(seg); if (maxSub < bestSeg || bestSeg.empty()) { bestSeg = maxSub; end = j; } } segments.push_back(s.substr(start, end - start + 1)); start = end + 1; } segments.push_back(s.substr(start)); std::string minWeight = maxSubsequence(segments[0]); for (const auto& seg : segments) { std::string maxSub = maxSubsequence(seg); if (maxSub < minWeight) { minWeight = maxSub; } } return minWeight; } int main() { std::string s = "abcdefg"; int k = 3; std::string minWeight = minWeightSplit(s, k); std::cout << "字典序最小的权值: " << minWeight << std::endl; return 0; } ``` 1. 对于字符串的处理，要注意边界情况，避免越界访问。 2. 在比较子序列的字典序时，要确保比较的逻辑正确。 3. 循环的终止条件要仔细设置，防止出现死循环或遗漏情况。 [2024-12-21 18:31:52 | AI写代码神器 | 571点数解答]