Data commit

Task/Greatest-subsequential-sum/Swift/greatest-subsequential-sum.swift

@@ -0,0 +1,22 @@
+func maxSubseq(sequence: [Int]) -> (Int, Int, Int) {
+    var maxSum = 0, thisSum = 0, i = 0
+    var start = 0, end = -1
+    for (j, seq) in sequence.enumerated() {
+        thisSum += seq
+        if thisSum < 0 {
+            i = j + 1
+            thisSum = 0
+        } else if (thisSum > maxSum) {
+            maxSum = thisSum
+            start = i
+            end = j
+        }
+    }
+    return start <= end && start >= 0 && end >= 0
+        ? (start, end + 1, maxSum) : (0, 0, 0)
+}
+
+let a = [-1, -2, 3, 5, 6, -2, -1, 4, -4, 2, -1]
+let (start, end, maxSum) = maxSubseq(sequence: a)
+print("Max sum = \(maxSum)")
+print(a[start..<end])