Add 1326_Minimum_Number_of_Taps_to_Open_to_Water_a_Garden.java

Author: seanprashad

Greedy/1326_Minimum_Number_of_Taps_to_Open_to_Water_a_Garden.java

@@ -0,0 +1,33 @@
+class Solution {
+    public int minTaps(int n, int[] ranges) {
+        int[] nums = new int[ranges.length];
+
+        for (int i = 0; i < ranges.length; i++) {
+            if (ranges[i] == 0) {
+                continue;
+            }
+
+            int left = Math.max(0, i - ranges[i]);
+            nums[left] = Math.max(nums[left], i + ranges[i]);
+        }
+
+        int i = 0, end = 0, jumps = 0, maxReach = 0;
+
+        while (i < nums.length && end < n) {
+            ++jumps;
+
+            while (i < nums.length && i <= end) {
+                maxReach = Math.max(maxReach, nums[i]);
+                ++i;
+            }
+
+            if (end == maxReach) {
+                return -1;
+            }
+
+            end = maxReach;
+        }
+
+        return jumps;
+    }
+}