Windows系统对拍程序

Windows系统对拍程序，其中包含c++11用法，请使用c++11标准编译。此对拍程序会在发现错误时显示错误行号以及对应内容，方便比对。

此对拍程序自动使用g++对源代码进行编译。如果出现找不到g++的错误，请将g++所在目录添加至系统的环境变量列表中；

也可直接注释掉主函数前几行不用自动编译，并将编译好的pai_data.exe（生成数据）、pai_user.exe（用户程序）、pai_std.exe（标准解答程序）放至与本程序所在同目录下。

准备就绪后编译并运行本程序即可。

UPD 2019-04-10：添加了对标程的计时。

UPD 2019-04-18：修复当文件尾没有换行时会导致错误判断的问题。

 #include <cerrno>
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
 #include <ctime>
 
 // 设置区
 namespace Settings {
 const int MAX_LEN = ;  // 发现错误时,显示错误行数据的最大长度
 const int CASE_CNT = ;                 // 对拍测试次数
 const int BUFFER_SIZE =  << ;          // 每行的缓冲区大小
 const char *const dataFile = "data.cpp";  // 随机生成数据的源代码文件名
 const char *const userFile = "user.cpp";  // 需要测试的源代码文件名
 const char *const stdFile = "std.cpp";    // 标准答案的源代码文件名
 const char *const dataExeName = "pai_data.exe";
 const char *const userExeName = "pai_user.exe";
 const char *const stdExeName = "pai_std.exe";
 const char *const dataOutputName = "pai_data.txt";
 const char *const userOutputName = "pai_user.txt";
 const char *const stdOutputName = "pai_std.txt";
 }  // namespace Settings
 
 using namespace Settings;
 using namespace std;
 
 char cmd[BUFFER_SIZE], info[BUFFER_SIZE * ];
 char buf1[BUFFER_SIZE], buf2[BUFFER_SIZE];
 
 template <typename... T>
 int run(const char *str, T... args) {
     sprintf(cmd, str, args...);
     return system(cmd);
 }
 
 bool fileCompare(const char *stdOutput, const char *userOutput) {
     FILE *fp_std = fopen(stdOutput, "r"), *fp_user = fopen(userOutput, "r");
     if (fp_std == nullptr || fp_user == nullptr) {
         sprintf(info, "Open file failed: %s\n", strerror(errno));
         return false;
     }
     bool flag = true;
     for (int i = ; !feof(fp_std) && !feof(fp_user); ++i) {
         char *p1 = fgets(buf1, BUFFER_SIZE, fp_std);
         char *p2 = fgets(buf2, BUFFER_SIZE, fp_user);
         if (p1 == nullptr && p2 == nullptr) {
             flag = true;
             break;
         } else {
             int len1 = p1 ? strlen(p1) : -, len2 = p2 ? strlen(p2) : -;
             if (p1 && p1[len1 - ] == '\n') p1[len1 - ] = , --len1;
             if (p2 && p2[len2 - ] == '\n') p2[len2 - ] = , --len2;
             if (p1 == nullptr || p2 == nullptr || len1 != len2 ||
                 strcmp(p1, p2)) {
                 if (len1 > MAX_LEN)
                     sprintf(p1 + MAX_LEN, "... (%d characters omitted)",
                             len1 - MAX_LEN);
                 if (len2 > MAX_LEN)
                     sprintf(p2 + MAX_LEN, "... (%d characters omitted)",
                             len2 - MAX_LEN);
                 sprintf(info,
                         "Difference found in line %d:\n  std: %s\n user: %s\n",
                         i, p1 ? p1 : "(EOF Detected)",
                         p2 ? p2 : "(EOF Detected)");
                 flag = false;
                 break;
             }
         }
     }
     fclose(fp_std), fclose(fp_user);
     return flag;
 }
 
 int main() {
     int totaltimeCnt = ;
     printf("Compiling... ");
     if (run("g++ %s -o %s", userFile, userExeName) ||
         run("g++ %s -o %s", stdFile, stdExeName) ||
         run("g++ %s -o %s", dataFile, dataExeName)) {
         puts("Compile failed.");
         printf("Press ENTER to exit.\n");
         getchar();
         return ;
     }
 
     puts("Finished.");
     clock_t stUser, edUser, stStd, edStd;
     bool Accepted = true;
     for (int i = , ret; i <= CASE_CNT; ++i) {
         printf("Case %03d: ", i);
         run("%s >%s", dataExeName, dataOutputName);
 
         // run std solution
         stStd = clock();
         ret = run("%s <%s >%s", stdExeName, dataOutputName, stdOutputName);
         edStd = clock();
         if (ret) {
             printf("Non Zero Exit Code: Std solution returned value %d\n", ret);
             Accepted = false;
             break;
         }
 
         // run user's solution
         stUser = clock();
         ret = run("%s <%s >%s", userExeName, dataOutputName, userOutputName);
         edUser = clock();
         if (ret) {
             printf("Non Zero Exit Code: User's solution returned value %d\n",
                    ret);
             Accepted = false;
             break;
         }
 
         if (!fileCompare(stdOutputName, userOutputName)) {
             printf("Wrong answer.\n------------------------------\n");
             printf("%s", info);
             printf("------------------------------\n");
             Accepted = false;
             break;
         }
 
         printf("Accepted. StdTime:%4d ms, UserTime:%4d ms\n",
                int(edStd - stStd), int(edUser - stUser));
         totaltimeCnt += int(edUser - stUser);
     }
     if (Accepted) {
         printf("\nUser's solution got accepted after %d tests.\n", CASE_CNT);
         printf("Average time spent: %.2f ms.\n",
                double(totaltimeCnt) / CASE_CNT);
     }
     printf("Press ENTER to exit.\n");
     getchar();
     return ;
 }