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formatting source-code for d7af6fdc8c
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@@ -1,4 +1,4 @@
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//Program to calculate length of longest increasing subsequence in an array
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// Program to calculate length of longest increasing subsequence in an array
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// in O(n log n)
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// tested on : https://cses.fi/problemset/task/1145/
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@@ -7,30 +7,32 @@
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using namespace std;
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int LIS(int arr[], int n)
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{
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set < int > active; // The current built LIS.
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set<int> active; // The current built LIS.
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active.insert(arr[0]);
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// Loop through every element.
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for (int i = 1; i < n; ++i)
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{
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auto get = active.lower_bound(arr[i]);
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if (get == active.end())
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{
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{
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active.insert(arr[i]);
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} // current element is the greatest so LIS increases by 1.
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} // current element is the greatest so LIS increases by 1.
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else
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{
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int val = * get; // we find the position where arr[i] will be in the LIS. If it is in the LIS already we do nothing
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{
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int val = *get; // we find the position where arr[i] will be in the
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// LIS. If it is in the LIS already we do nothing
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if (val > arr[i])
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{
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// else we remove the bigger element and add a smaller element (which is arr[i]) and continue;
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{
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// else we remove the bigger element and add a smaller element
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// (which is arr[i]) and continue;
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active.erase(get);
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active.insert(arr[i]);
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}
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}
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}
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return active.size(); // size of the LIS.
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return active.size(); // size of the LIS.
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}
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int main(int argc, char const * argv[])
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int main(int argc, char const* argv[])
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{
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int n;
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cout << "Enter size of array: ";
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