diff --git a/introductory.go b/introductory.go
index ab0688e..e8e4f63 100644
--- a/introductory.go
+++ b/introductory.go
@@ -45,3 +45,36 @@ func MissingNumber(n int, numbers []int) int {
 
 	return -3
 }
+
+func Repetitions(dna string) int {
+	curC := ' '
+	maxL := 0
+	curL := 0
+
+	for _, c := range dna {
+		if c == curC {
+			curL += 1
+		} else {
+			curC = c
+			curL = 1
+		}
+
+		if curL > maxL {
+			maxL = curL
+		}
+	}
+
+	return maxL
+}
+
+func IncreasingArray(size int, arr []int) int {
+	moves := 0
+
+	for i := 0; i < len(arr)-1; i++ {
+		if arr[i] > arr[i+1] {
+			moves += arr[i] - arr[i+1]
+		}
+	}
+
+	return moves
+}
diff --git a/introductory_test.go b/introductory_test.go
index a20c4fa..e648f48 100644
--- a/introductory_test.go
+++ b/introductory_test.go
@@ -14,3 +14,15 @@ func TestMissingNumber(t *testing.T) {
 	assert.Equal(t, 4, MissingNumber(5, []int{2, 3, 1, 5}))
 	assert.Equal(t, 7, MissingNumber(9, []int{2, 3, 1, 5, 4, 6, 9, 8}))
 }
+
+func TestRepetitions(t *testing.T) {
+	assert.Equal(t, 0, Repetitions(""))
+	assert.Equal(t, 3, Repetitions("ATTCGGGA"))
+	assert.Equal(t, 4, Repetitions("AGGTTCGGGGA"))
+}
+
+func TestIncreasingArray(t *testing.T) {
+	assert.Equal(t, 0, IncreasingArray(5, []int{}))
+	assert.Equal(t, 0, IncreasingArray(5, []int{3}))
+	assert.Equal(t, 5, IncreasingArray(5, []int{3, 2, 5, 1, 7}))
+}