first commit

J03030 - BIẾN ĐỔI A – B.java

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+/*
+ * This Java source file was generated by the Gradle 'init' task.
+ */
+package nxt;
+import java.util.Scanner;
+public class App {
+    public static void main(String[] args) {
+        Scanner sc=new Scanner(System.in);
+        String s = sc.next();
+        int n = s.length();
+        int[] dpA = new int[n+1];
+        int[] dpB = new int[n+1];
+        for(int i=1; i<=n; i++){
+            if(s.charAt(i-1)=='A'){
+                dpA[i]=Math.min(dpA[i-1],dpB[i-1]+1);
+                dpB[i]=Math.min(dpB[i-1]+1, dpA[i-1]+1);
+            }else{
+                dpA[i]=Math.min(dpA[i-1]+1,dpB[i-1]+1);
+                dpB[i]=Math.min(dpB[i-1], dpA[i-1]+1);
+            }
+        }
+        System.out.print(dpA[n]);
+        sc.close();
+    }
+}