TheAlgorithms-C-Plus-Plus/dynamic_programming/longest_increasing_subsequence.cpp

// Program to calculate length of longest increasing subsequence in an array
#include <bits/stdc++.h>
using namespace std;
int LIS(int a[], int n) {
    int lis[n];
    for (int i = 0; i < n; ++i) {
        lis[i] = 1;
    }
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < i; ++j) {
            if (a[i] > a[j] && lis[i] < lis[j] + 1)
                lis[i] = lis[j] + 1;
        }
    }
    int res = 0;
    for (int i = 0; i < n; ++i) {
        res = max(res, lis[i]);
    }
    return res;
}
int main(int argc, char const *argv[]) {
    int n;
    cout << "Enter size of array: ";
    cin >> n;
    int a[n];
    cout << "Enter array elements: ";
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
    }
    cout << LIS(a, n) << endl;
    return 0;
}