int i=0; foreach (QString str ,students[i]) { qDebug() << str; i++; const QString studentID = str; for(auto& id : students){ auto studentIt = m_students.find(id); if(studentIt == m_students.end()){ qDebug() << "student is not exist"; return; } auto it = studentIt.value()->m_workMap.find(actName); if(it != studentIt.value()->m_workMap.end()){ qDebug() << "activity repeat"; return; } activity* act = new activity; act->m_name = actName; act->m_startTime = time; act->m_endTime = -1; act->m_type = type; act->m_data.push_back(data); act->m_week.push_back(week); studentIt.value()->m_workMap.insert(act->m_name, act); log(m_currentPeople, "发布了活动[" + actName + "]给[" + studentIt.value()->m_name + "]"); } }

这段代码中似乎有一个问题，即在第2行中声明了 `int i=0;`，但是在 `foreach` 循环中没有对 `i` 进行更新，这会导致 `students[0]` 中的元素被反复处理，而其他 `students` 中的元素则不会被处理。可能需要将 `i` 的更新操作移动到 `foreach` 循环中。另外，代码中涉及到了一些函数和变量，但是缺少上下文，因此无法判断代码的整体逻辑和正确性。

相关问题

assert(students.size() > 1); int i=0; foreach (QString str ,students[++i]) { qDebug() << str; const QString studentID = str; for(auto& id : students){ auto studentIt = m_students.find(id); if(studentIt == m_students.end()){ qDebug() << "student is not exist"; return; } auto it = studentIt.value()->m_workMap.find(actName); if(it != studentIt.value()->m_workMap.end()){ qDebug() << "activity repeat"; return; } activity* act = new activity; act->m_name = actName; act->m_startTime = time; act->m_endTime = -1; act->m_type = type; act->m_data.push_back(data); act->m_week.push_back(week); studentIt.value()->m_workMap.insert(act->m_name, act); log(m_currentPeople, "发布了活动[" + actName + "]给[" + studentIt.value()->m_name + "]"); } }

在这段代码中，对 `i` 进行了自增操作，但是自增操作的位置不正确。如果想要从 `students[1]` 开始遍历，应该将 `i` 的初始值设为 `-1`，并将自增操作放在 `foreach` 循环内部。例如：

assert(students.size() > 1);
int i = -1;
foreach (QString str, students) {
    if (++i == 0) continue;  // 跳过第一个元素
    qDebug() << str;
    const QString studentID = str;
    for (auto& id : students) {
        auto studentIt = m_students.find(id);
        if (studentIt == m_students.end()) {
            qDebug() << "student is not exist";
            return;
        }
        auto it = studentIt.value()->m_workMap.find(actName);
        if (it != studentIt.value()->m_workMap.end()) {
            qDebug() << "activity repeat";
            return;
        }
        activity* act = new activity;
        act->m_name = actName;
        act->m_startTime = time;
        act->m_endTime = -1;
        act->m_type = type;
        act->m_data.push_back(data);
        act->m_week.push_back(week);
        studentIt.value()->m_workMap.insert(act->m_name, act);
        log(m_currentPeople, "发布了活动[" + actName + "]给[" + studentIt.value()->m_name + "]");
    }
}

这样就可以从 `students[1]` 开始遍历了。同时，还需要注意，在 `foreach` 循环中遍历 `students` 时，不再需要使用 `++i`，因为 `foreach` 会自动遍历所有元素。

foreach (QString str, list) { qDebug() << str; const QString studentID = str; for(auto& studentID : students){ auto studentIt = m_students.find(studentID); if(studentIt == m_students.end()){ qDebug() << "student is not exist"; return; } auto it = studentIt.value()->m_workMap.find(actName); if(it != studentIt.value()->m_workMap.end()){ qDebug() << "activity repeat"; return; } activity* act = new activity; act->m_name = actName; act->m_startTime = time; act->m_endTime = -1; act->m_type = type; act->m_data.push_back(data); act->m_week.push_back(week); studentIt.value()->m_workMap.insert(act->m_name, act); log(m_currentPeople, "发布了活动[" + actName + "]给[" + studentIt.value()->m_name + "]"); } }

这段代码中使用了两个名为`studentID`的变量，一个是foreach语句中的迭代变量，另一个是for循环中的auto& studentID。这会导致编译错误，因为在同一作用域中不能有同名变量。如果你想在for循环中使用迭代变量，可以将其更改为不同的名称，例如：

foreach (QString str, list) {                 
    qDebug() << str;                 
    const QString studentID = str;                 
    for(auto& id : students){                     
        auto studentIt = m_students.find(id);                     
        if(studentIt == m_students.end()){                         
            qDebug() << "student is not exist";                         
            return;                     
        }                      
        auto it = studentIt.value()->m_workMap.find(actName);                     
        if(it != studentIt.value()->m_workMap.end()){                         
            qDebug() << "activity repeat";                         
            return;                     
        }                      
        activity* act = new activity;                     
        act->m_name = actName;                     
        act->m_startTime = time;                     
        act->m_endTime = -1;                     
        act->m_type = type;                     
        act->m_data.push_back(data);                     
        act->m_week.push_back(week);                      
        
        studentIt.value()->m_workMap.insert(act->m_name, act);                     
        log(m_currentPeople, "发布了活动[" + actName + "]给[" + studentIt.value()->m_name + "]");             
    }          
}

这样就能避免同名变量的问题了。