From 255999758cc3035e31bbb26212a07fb9aec31476 Mon Sep 17 00:00:00 2001
From: fleyx <fleyx20@outlook.com>
Date: Tue, 19 Dec 2023 17:08:51 +0800
Subject: [PATCH] add

---
 5.leetcode/src/com/fanxb/common/Q134.java | 39 +++++++++++++++++++++++
 5.leetcode/src/com/fanxb/common/Q135.java | 27 ++++++++++++++--
 5.leetcode/src/com/fanxb/common/Q238.java | 33 +++++++++++++++++++
 5.leetcode/src/com/fanxb/common/Q274.java | 28 ++++++++++++++++
 5.leetcode/src/com/fanxb/common/Q42.java  | 22 +++++++++++++
 5.leetcode/src/com/fanxb/common/Q55.java  | 36 +++++++++++++++++++++
 6 files changed, 183 insertions(+), 2 deletions(-)
 create mode 100644 5.leetcode/src/com/fanxb/common/Q134.java
 create mode 100644 5.leetcode/src/com/fanxb/common/Q238.java
 create mode 100644 5.leetcode/src/com/fanxb/common/Q274.java
 create mode 100644 5.leetcode/src/com/fanxb/common/Q55.java

diff --git a/5.leetcode/src/com/fanxb/common/Q134.java b/5.leetcode/src/com/fanxb/common/Q134.java
new file mode 100644
index 0000000..4bb2919
--- /dev/null
+++ b/5.leetcode/src/com/fanxb/common/Q134.java
@@ -0,0 +1,39 @@
+package com.fanxb.common;
+
+/**
+ * 分割回文串
+ *
+ * @author fanxb
+ * @date 2022/3/9 10:10
+ */
+public class Q134 {
+
+    public int canCompleteCircuit(int[] gas, int[] cost) {
+        int length = gas.length;
+        for (int i = 0; i < length; i++) {
+            gas[i] = gas[i] - cost[i];
+        }
+        for (int i = 0; i < length; i++) {
+            //try from i
+            int sum = 0;
+            boolean ok = true;
+            for (int j = 0; j < length; j++) {
+                sum += gas[(i + j) % length];
+                if (sum < 0) {
+                    ok = false;
+                    i += j;
+                    break;
+                }
+            }
+            if (ok) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
+
+    public static void main(String[] args) {
+        System.out.println(new Q134().canCompleteCircuit(new int[]{1, 2, 3, 4, 5}, new int[]{3, 4, 5, 1, 2}));
+    }
+}
diff --git a/5.leetcode/src/com/fanxb/common/Q135.java b/5.leetcode/src/com/fanxb/common/Q135.java
index 387e2ac..3e8834d 100644
--- a/5.leetcode/src/com/fanxb/common/Q135.java
+++ b/5.leetcode/src/com/fanxb/common/Q135.java
@@ -38,9 +38,32 @@ public class Q135 {
         return count;
     }
 
+    public static int candy1(int[] ratings) {
+        //every one set one candy
+        int length = ratings.length;
+        int[] res = new int[length];
+        Arrays.fill(res, 1);
+        for (int i = 1; i < length; i++) {
+            //从左到右遍历，如果下一个人分数更高那么多发一颗糖
+            if (ratings[i] > ratings[i - 1]) {
+                res[i] = res[i - 1] + 1;
+            }
+        }
+        for (int i = length - 2; i >= 0; i--) {
+            if (ratings[i] > ratings[i + 1] && res[i] <= res[i + 1]) {
+                res[i] = res[i + 1] + 1;
+            }
+        }
+        int sum = 0;
+        for (int temp : res) {
+            sum += temp;
+        }
+        return sum;
+    }
+
     public static void main(String[] args) {
-        int[] s = {1, 2, 87, 87, 87, 2, 1};
+        int[] s = {1, 3, 4, 5, 2};
         System.out.println(Arrays.toString(s));
-        System.out.println(candy(s));
+        System.out.println(candy1(s));
     }
 }
diff --git a/5.leetcode/src/com/fanxb/common/Q238.java b/5.leetcode/src/com/fanxb/common/Q238.java
new file mode 100644
index 0000000..774a7d4
--- /dev/null
+++ b/5.leetcode/src/com/fanxb/common/Q238.java
@@ -0,0 +1,33 @@
+package com.fanxb.common;
+
+import java.util.Arrays;
+import java.util.LinkedList;
+
+public class Q238 {
+
+    public int[] productExceptSelf(int[] nums) {
+        int length = nums.length;
+        if (length <= 1) return nums;
+        int[] left = new int[length];
+        left[0] = nums[0];
+        for (int i = 1; i < length; i++) {
+            left[i] = left[i - 1] * nums[i];
+        }
+        int[] right = new int[length];
+        right[length - 1] = nums[length - 1];
+        for (int i = length - 2; i >= 0; i--) {
+            right[i] = right[i + 1] * nums[i];
+        }
+        for (int i = 1; i < length - 1; i++) {
+            nums[i] = left[i - 1] * right[i + 1];
+        }
+        nums[0] = right[1];
+        nums[length - 1] = left[length - 2];
+        return nums;
+    }
+
+
+    public static void main(String[] args) {
+        System.out.println(Arrays.toString(new Q238().productExceptSelf(new int[]{1, 0})));
+    }
+}
diff --git a/5.leetcode/src/com/fanxb/common/Q274.java b/5.leetcode/src/com/fanxb/common/Q274.java
new file mode 100644
index 0000000..6f1b02c
--- /dev/null
+++ b/5.leetcode/src/com/fanxb/common/Q274.java
@@ -0,0 +1,28 @@
+package com.fanxb.common;
+
+import java.util.Arrays;
+import java.util.Collections;
+
+/**
+ * Created with IntelliJ IDEA
+ *
+ * @author fanxb
+ * Date: 2020/6/11 9:56
+ */
+public class Q274 {
+    public int hIndex(int[] citations) {
+        Arrays.sort(citations);
+        int length = citations.length, count = 0;
+        for (int i = length - 1; i >= 0; i--) {
+            if (citations[i] < count + 1) {
+                break;
+            }
+            count++;
+        }
+        return count;
+    }
+
+    public static void main(String[] args) {
+        System.out.println(new Q274().hIndex(new int[]{1, 3, 1}));
+    }
+}
diff --git a/5.leetcode/src/com/fanxb/common/Q42.java b/5.leetcode/src/com/fanxb/common/Q42.java
index 4ee4926..5cfba89 100644
--- a/5.leetcode/src/com/fanxb/common/Q42.java
+++ b/5.leetcode/src/com/fanxb/common/Q42.java
@@ -67,9 +67,31 @@ public class Q42 {
         return res;
     }
 
+    public int trap2(int[] height) {
+        int length = height.length;
+        //i左边的最大高度
+        int[] left = new int[length];
+        left[0] = 0;
+        //i右边的最大高度
+        int[] right = new int[length];
+        right[length - 1] = 0;
+        for (int i = 1; i < length; i++) {
+            left[i] = Math.max(left[i - 1], height[i - 1]);
+            right[length - i - 1] = Math.max(right[length - i], height[length - i]);
+        }
+        int res = 0;
+        for (int i = 1; i < length - 1; i++) {
+            int temp = Math.min(left[i], right[i]) - height[i];
+            if (temp > 0) {
+                res += temp;
+            }
+        }
+        return res;
+    }
 
     public static void main(String[] args) {
         System.out.println(new Q42().trap(new int[]{0, 1, 0, 2, 1, 0, 1, 3, 2, 1, 2, 1}));
         System.out.println(new Q42().trap1(new int[]{0, 1, 0, 2, 1, 0, 1, 3, 2, 1, 2, 1}));
+        System.out.println(new Q42().trap2(new int[]{0, 1, 0, 2, 1, 0, 1, 3, 2, 1, 2, 1}));
     }
 }
diff --git a/5.leetcode/src/com/fanxb/common/Q55.java b/5.leetcode/src/com/fanxb/common/Q55.java
new file mode 100644
index 0000000..7d48575
--- /dev/null
+++ b/5.leetcode/src/com/fanxb/common/Q55.java
@@ -0,0 +1,36 @@
+package com.fanxb.common;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Stack;
+
+/**
+ * Created with IntelliJ IDEA
+ *
+ * @author fanxb
+ * Date: 2020/6/9 15:10
+ */
+public class Q55 {
+
+    public boolean canJump(int[] nums) {
+        int n = nums.length;
+        if (n == 1) {
+            return true;
+        }
+        int val = nums[0];
+        for (int i = 1; i < nums.length; i++) {
+            if (val < i) {
+                //说明走不到这一步，不用继续了
+                return false;
+            }
+            val = Math.max(val, i + nums[i]);
+        }
+        return val >= n - 1;
+
+    }
+
+    public static void main(String[] args) {
+        System.out.println(new Q55().canJump(new int[]{1, 0, 1, 0}));
+    }
+}