Update Solution2.java

solution/1200-1299/1208.Get Equal Substrings Within Budget/Solution2.java

@@ -1,16 +1,15 @@
 class Solution {
     public int equalSubstring(String s, String t, int maxCost) {
         int n = s.length();
-        int sum = 0;
-        int ans = 0;
-        for (int i = 0, j = 0; i < n; ++i) {
-            sum += Math.abs(s.charAt(i) - t.charAt(i));
-            while (sum > maxCost) {
-                sum -= Math.abs(s.charAt(j) - t.charAt(j));
-                ++j;
+        int ans = 0, cost = 0;
+        for (int l = 0, r = 0; r < n; ++r) {
+            cost += Math.abs(s.charAt(r) - t.charAt(r));
+            while (cost > maxCost) {
+                cost -= Math.abs(s.charAt(l) - t.charAt(l));
+                ++l;
             }
-            ans = Math.max(ans, i - j + 1);
+            ans = Math.max(ans, r - l + 1);
         }
         return ans;
     }
-}
+}