为什么我不能在迭代时编辑一组/地图? 例如:
bool flag;
set <int> :: iterator aIterator;
set <int> :: iterator bIterator;
bIterator = B.begin();
for (bIterator=B.begin(); bIterator!=B.end(); ++bIterator)
{
flag = true;
aIterator = A.begin();
for (aIterator=A.begin(); aIterator!=A.end(); ++aIterator)
{
if (*bIterator == *aIterator)// if an elemnet in B is found in A, delete that element from A and check the next element of B
{
A.erase(aIterator);
flag = false;
break;
}
}
if (flag == true)
A.insert(*bIterator); //if not found then add that element to A(which now represents the set of symmetric difference)
}
我该如何处理?我的意思是,如何在迭代时编辑一组?
答案 0 :(得分:1)
这样做:
for (aIterator=A.begin(); aIterator!=A.end(); ++aIterator)
不是这样的:
for (bIterator=A.begin(); bIterator!=A.end(); ++aIterator)
Iterator未初始化,您无法递增它。
其余部分看起来还不错。