C++常用语法

unordered_map<int, Node*> mp;
if (mp.find(key) == mp.end())
unordered_map<int, Node*>::iterator it = mp.find(deltmp->key);
mp.erase(it);
mp.clear();
map[k]++ // this includes the case when count of k from 0 to 1
for (unordered_map<float, int>::iterator it = mp.begin(); it != mp.end(); it++) {

int result = num_stack.top();
num_stack.pop();

#define pp pair<int, char>
priority_queue<pp, vector<pp>, greater<pp> > que;

set<char> visit;
if (visit.count(node) != 0) continue;
visit.insert(node);

bool comp(const IntervalPair &pa, const IntervalPair &pb) {
    if (pa.start != pb.start) {
        return pa.start < pb.start;
    } else {
        return pb.end < pb.end;
    }
}
sort(vec.begin(), vec.end(), comp);
sort(vec.begin()+5, vec.begin()+10);
que.front();