int LRUCacheMiss(vector<int> input, int maxSize) {
typedef list<int> LI;
typedef list<int>::iterator LII; // key iterator
typedef unordered_map<int, LII> MLII; // key, (key iterator)
LI cache;
MLII check;
int count = 0;
for (int i = 0; i < input.size(); i++) {
if (check.count(input[i]) > 0) {
// found in the LRU cache.
cache.erase(check[input[i]]);
cache.push_front(input[i]);
check[input[i]] = cache.begin();
}
else {
// not found, miss happens.
count++;
cache.push_front(input[i]);
check[input[i]] = cache.begin();
if (cache.size() > maxSize) {
int key = cache.back();
cache.pop_back();
check.erase(key);
}
}
}
return count;
}
/**
* @param numbers: Give an array numbersbers of n integer
* @param target: you need to find four elements that's sum of target
* @return: Find all unique quadruplets in the array which gives the sum of
* zero.
*/
LLI fourSum(LI nums, int target) {
sort(nums.begin(), nums.end());
LLI res;
LI set;
fourSum(res, set, nums, 0, target);
return res;
}
void set(int key, int value) {
auto it = cache.find(key);
if(it!=cache.end()) {
update(it);
} else {
if(used.size()==cap) {
cache.erase(used.back());
used.pop_back();
}
used.push_front(key);
}
cache[key] = {value, used.begin()};
}
void combine(LLI &results, LI &set, LI &candidates, int k, int target) {
int sum = 0;
for (int x : set)
sum += x;
if (sum == target) {
LI sorted = set;
sort(sorted.begin(), sorted.end());
results.push_back(sorted);
return;
}
if (target < sum)
return;
for (int i = k; i < candidates.size(); ++i) {
set.push_back(candidates[i]);
combine(results, set, candidates, i, target);
set.pop_back();
}
}
void update(HPIL::iterator it){
int key = it->first;
lru.erase(it->second.second);
lru.push_front(key);
it->second.second = lru.begin();
}
void update(HIPII::iterator it) {
int key = it->first;
used.erase(it->second.second);
used.push_front(key);
it->second.second = used.begin();
}
LI::iterator DLL::find(int val){
LI::iterator it;
for(it=dt.begin();it!=dt.end();++it)
if((*it) == val) return it;
return it;
}
void DLL::print(){
LI::iterator it;
for(it=dt.begin();it!=dt.end();++it)
cout << (*it) << "->";
cout << "NULL" << endl;
}