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Zigzag_Iterator.cpp

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class ZigzagIterator {

public:

#define VECTOR_NUM 2

int curr;

vector<int> v1, v2;

vector<int>::iterator it1, it2;

ZigzagIterator(vector<int>& v1, vector<int>& v2) {

this->v1 = v1;

this->v2 = v2;

it1 = this->v1.begin();

it2 = this->v2.begin();

curr = 0;

}

int next() {

int ret;

if(curr == 0) {

if(it1 != v1.end()) {

ret = *it1;

++it1;

} else if(it2 != v2.end()) {

ret = *it2;

++it2;

}

} else if(curr == 1) {

if(it2 != v2.end()) {

ret = *it2;

++it2;

} else if(it1!= v1.end()) {

ret = *it1;

++it1;

}

}

++curr;

curr %= VECTOR_NUM;

return ret;

}

bool hasNext() {

return it1 != v1.end() or it2 != v2.end();

}

};

/**

* Your ZigzagIterator object will be instantiated and called as such:

* ZigzagIterator i(v1, v2);

* while (i.hasNext()) cout << i.next();

*/