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array-of-doubled-pairs.cpp
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array-of-doubled-pairs.cpp
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class Solution {
public:
bool canReorderDoubled(vector<int>& A) {
int size = A.size();
if (size == 0) return true;
sort(A.begin(), A.end());
map<int,int>mp;
bool hasNegavite = false;
int pos = 0;
for (int i = 0; i < size; i++){
mp[A[i]]++;
if(A[i] < 0){
hasNegavite = true;
pos = i;
}
}
if (hasNegavite){
if (!(pos & 1)) return false;
for (int i = pos; i >= 0; i--){
if (mp[A[i]] != 0) {
if (mp[2 * A[i]] != 0){
mp[A[i]]--;
mp[2 * A[i]]--;
}else return false;
}
}
for (int i = pos + 1; i < size; i++){
if (mp[A[i]] != 0){
if (mp[2 * A[i]] != 0){
mp[A[i]]--;
mp[2 * A[i]]--;
}else return false;
}
}
}else{
for (int i = 0; i < size; i++){
if (mp[A[i]] != 0){
if (mp[2 * A[i]] != 0){
mp[A[i]]--;
mp[2 * A[i]]--;
}else return false;
}
}
}
return true;
}
};