add

5.leetcode/src/com/fanxb/common/Q401.java

@@ -0,0 +1,39 @@
+package com.fanxb.common;
+
+import com.sun.tools.jconsole.JConsoleContext;
+
+import java.util.*;
+
+/**
+ * 两数相加
+ *
+ * @author fanxb
+ * @date 2021/6/1
+ **/
+public class Q401 {
+    private static Map<Integer, LinkedList<String>> map=new HashMap<>(10);
+    static {
+        for(int i=0;i<=11;i++){
+            for(int j=0;j<=59;j++){
+                LinkedList<String> linkedList = map.computeIfAbsent(count(i)+count(j),k->new LinkedList<>());
+                linkedList.add(i+":"+(j<10?"0"+j:j));
+            }
+        }
+    }
+    private static int count(int x){
+        int count=0;
+        while (x>0){
+           x-=x&(-x);
+           count++;
+        }
+        return count;
+    }
+
+    public List<String> readBinaryWatch(int turnedOn) {
+        return map.getOrDefault(turnedOn,new LinkedList<String>());
+    }
+
+    public static void main(String[] args) {
+        new Q401().readBinaryWatch(1);
+    }
+}

5.leetcode/src/com/fanxb/common/Q877.java

@@ -0,0 +1,38 @@
+package com.fanxb.common;
+
+/**
+ * 两数相加
+ *
+ * @author fanxb
+ * @date 2021/6/1
+ **/
+public class Q877 {
+    public boolean stoneGame(int[] piles) {
+        int l=0,r=piles.length-1;
+        long a=0,b=0;
+        //是否a选择
+        boolean aChange=true;
+        while (l<=r){
+            int res =piles[r]-piles[l];
+            if (res <= 0) {
+                //说明左边的不小于右边的
+                if(aChange){
+                    a+=piles[l++];
+                }else{
+                    b+=piles[l++];
+                }
+            }else{
+                if(aChange){
+                    a+=piles[r--];
+                }else{
+                    b+=piles[r--];
+                }
+            }
+            aChange=!aChange;
+        }
+        return a>b;
+    }
+    public static void main(String[] args) {
+        System.out.println(new Q877().stoneGame(new int[]{5,3,4,5}));
+    }
+}