maxsubarray: initial commit

algorithms/dynamic_programming/maxsubarray/README.md

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+<https://www.hackerrank.com/challenges/maxsubarray>

algorithms/dynamic_programming/maxsubarray/solution.cpp

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+#include <iostream>
+#include <algorithm>
+
+
+int main()
+{
+    using namespace std;
+
+    size_t T;
+    cin >> T;
+
+    while (T--) {
+
+        size_t N;
+        cin >> N;
+
+        int v;
+        cin >> v;
+        N--;
+
+        long long max_sum_cont = v;
+        long long max_sum_cont_tmp = v;
+        long long max_sum_noncont = v;
+
+        while (N--) {
+
+            cin >> v;
+
+            max_sum_cont_tmp = max((long long)v, max_sum_cont_tmp + v);
+            max_sum_cont     = max(max_sum_cont, max_sum_cont_tmp);
+
+            max_sum_noncont  = max((long long)v, max_sum_noncont + (v > 0 ? v : 0));
+        }
+
+        cout << max_sum_cont << ' ' << max_sum_noncont << endl;
+    }
+
+    return 0;
+}