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ilpropheta/Counting pairs whose difference is K.cpp Secret

Created July 16, 2016 15:08
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Counting pairs whose difference is K.cpp
int N, K;
cin >> N >> K;
unordered_set<int> input;
copy_n(istream_iterator<int>(cin), N, inserter(input, end(input)));
cout << count_if(begin(input), end(input), [&](int currElem){
return input.count(currElem+K);
});
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