SLB二面

Q1

有一个文件有如下内容

using System.Reflection;

#if DEBUG
[assembly: AssemblyConfiguration("Debug")]
#else
[assembly: AssemblyConfiguration("Release")]
#endif

[assembly: AssemblyVersion("1.1")]
[assembly: AssemblyFileVersion("1.4.10.0")]
[assembly: AssemblyInformationalVersion("1.0.5.0")]

希望写一个C++函数，每次调用将该文件的AssemblyFileVersion和AssemblyInformationalVersion的倒数第二位加一。

void IncrementVersion(const std::string& filepath) {
    std::ifstream inFile(filepath);
    if (!inFile.is_open()) {
        std::cerr << "Failed to open the file." << std::endl;
        return;
    }

    std::ostringstream contents;
    std::string line;

    while (std::getline(inFile, line)) {
        if (line.find("AssemblyFileVersion") != std::string::npos || line.find("AssemblyInformationalVersion") != std::string::npos) {
            size_t lastDot = line.find_last_of('.');
            size_t secondLastDot = line.find_last_of('.', lastDot - 1);
            int number = std::stoi(line.substr(secondLastDot + 1, lastDot - secondLastDot - 1));
            number += 1;

            line = line.substr(0, secondLastDot + 1) + std::to_string(number) + line.substr(lastDot);
        }
        contents << line << "\n";
    }
    inFile.close();

    std::ofstream outFile(filepath, std::ios::trunc);
    if (!outFile.is_open()) {
        std::cerr << "Failed to open the file for writing." << std::endl;
        return;
    }
    outFile << contents.str();
    outFile.close();
}

或者用正则：

void IncrementVersionWithRegex(const std::string& filepath) {
    std::ifstream inFile(filepath);
    if (!inFile.is_open()) {
        std::cerr << "Failed to open the file." << std::endl;
        return;
    }

    std::ostringstream contents;
    std::string line;

    // Modified pattern to target the second to last number section of the version
    std::regex versionPattern(
	  R"delimiter((AssemblyFileVersion|AssemblyInformationalVersion)\("([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)"\))delimiter"
	);


    while (std::getline(inFile, line)) {
        std::smatch match;
        if (std::regex_search(line, match, versionPattern)) {
            int number = std::stoi(match[3].str());
            number += 1;

            // Construct the new version string
            std::string newVersion = match[1].str() + "(\"" + match[2].str() + "." + match[3].str() + "." + std::to_string(number) + "." + match[4].str() + "\")";
            
            line.replace(match.position(), match.length(), newVersion);
        }
        contents << line << "\n";
    }
    inFile.close();

    std::ofstream outFile(filepath, std::ios::trunc);
    if (!outFile.is_open()) {
        std::cerr << "Failed to open the file for writing." << std::endl;
        return;
    }
    outFile << contents.str();
    outFile.close();
}

int main() {
    IncrementVersionWithRegex("your_file_path_here.cs");
    return 0;
}

Q2

2. 两数相加

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode(int x) : val(x), next(NULL) {}
 * };
 */
class Solution {
    int carryOn = 0;
public:
    ListNode* addTwoNumbers(ListNode *l1, ListNode *l2) {
        if (l1 == nullptr && l2 == nullptr && carryOn == 0) {
            return nullptr;
        }

        int n1 = l1 == nullptr ? 0 : l1->val;
        int n2 = l2 == nullptr ? 0 : l2->val;
        int val = n1 + n2 + carryOn;
        carryOn = val / 10;
        val = val % 10;
        ListNode *cur = new ListNode();
        cur->val = val;
        cur->next = addTwoNumbers(
            l1 == nullptr? nullptr : l1->next,
            l2 == nullptr? nullptr : l2->next
        );

        return cur;
    }
};