diff --git a/src/main/java/com/dota/Main.java b/src/main/java/com/dota/Main.java
index e159df9..77c117d 100644
--- a/src/main/java/com/dota/Main.java
+++ b/src/main/java/com/dota/Main.java
@@ -10,15 +10,10 @@ public class Main {
     public static void main(String[] args) {
         // 当文本光标位于高亮显示的文本处时按 Alt+Enter，
         // 可查看 IntelliJ IDEA 对于如何修正该问题的建议。
-        System.out.print("Hello and welcome!");
-
-        // 按 Shift+F10 或点击装订区域中的绿色箭头按钮以运行脚本。
-        for (int i = 1; i <= 5; i++) {
-
-            // 按 Shift+F9 开始调试代码。我们已为您设置了一个断点，
-            // 但您始终可以通过按 Ctrl+F8 添加更多断点。
-            System.out.println("i = " + i);
-        }
+        double sum = 0;
+        int i = 225462;
+        sum += (double)i*i;
+        System.out.print(sum);
     }
 }
 
diff --git a/src/main/java/com/dota/binarySearch/_1870/Solution.java b/src/main/java/com/dota/binarySearch/_1870/Solution.java
new file mode 100644
index 0000000..1f087af
--- /dev/null
+++ b/src/main/java/com/dota/binarySearch/_1870/Solution.java
@@ -0,0 +1,28 @@
+package com.dota.binarySearch._1870;
+
+class Solution {
+	public static void main(String[] args) {
+		new Solution().minSpeedOnTime(new int[]{1,1,100000}, 2.01);
+	}
+	public int minSpeedOnTime(int[] dist, double hour) {
+    long l = 1; long r =  (1000 * 100000);
+		while (l < r) {
+			long mid = l + (r - l) / 2;
+			if (df(dist,mid) <= hour) {
+				r = mid;
+			} else {
+				l = mid + 1;
+			}
+		}
+		return df(dist, r) <= hour ? (int)r: -1 ;
+	}
+
+	double df(int[] dist, long speed) {
+		double sum = 0;
+		for (int i = 0; i < dist.length - 1; i++) {
+			sum += ((dist[i] + speed - 1) / speed);
+		}
+		sum += ((dist[dist.length - 1]) / (double) speed);
+		return sum;
+	}
+}
\ No newline at end of file
diff --git a/src/main/java/com/dota/binarySearch/_3296/Solution.java b/src/main/java/com/dota/binarySearch/_3296/Solution.java
new file mode 100644
index 0000000..a5bfb4c
--- /dev/null
+++ b/src/main/java/com/dota/binarySearch/_3296/Solution.java
@@ -0,0 +1,25 @@
+package com.dota.binarySearch._3296;
+
+class Solution {
+	public long minNumberOfSeconds(int mountainHeight, int[] workerTimes) {
+		long l = 1, r = (long) mountainHeight *(mountainHeight+1) * workerTimes[0] / 2;
+		while (l < r) {
+			long mid = l + (r - l) / 2;
+			long t = df(mid, workerTimes);
+			if (t >= mountainHeight) {
+				r = mid;
+			} else {
+				l = mid + 1;
+			}
+		}
+		return r;
+	}
+
+	long df(long t, int[] workerTimes) {
+		long sum = 0;
+		for (int workerTime : workerTimes) {
+			sum += (long) (Math.sqrt(1 + (double) (8 * t) / workerTime) - 1) / 2;
+		}
+		return sum;
+	}
+}
\ No newline at end of file
diff --git a/src/main/java/com/dota/binarySearch/_3453/Solution.java b/src/main/java/com/dota/binarySearch/_3453/Solution.java
new file mode 100644
index 0000000..5649815
--- /dev/null
+++ b/src/main/java/com/dota/binarySearch/_3453/Solution.java
@@ -0,0 +1,38 @@
+package com.dota.binarySearch._3453;
+
+class Solution {
+	public double separateSquares(int[][] squares) {
+		double l = squares[0][1], r = squares[0][1] + squares[0][2];
+		double area = 0;
+		for (int[] square : squares) {
+			l = Math.min(l, square[1]);
+			r = Math.max(r, square[1] + square[2]);
+			area += (double) square[2] * square[2];
+		}
+		area = area / 2.0;
+		for(int i=0;i<55;i++) {
+			double mid = l + (r - l) / 2;
+			var t = check(squares, mid, area);
+			if (t) {
+				r = mid;
+			} else {
+				l = mid + 0.000001;
+			}
+		}
+
+		return r;
+	}
+
+	boolean check(int[][] squares, double y, double area) {
+		// 1是上面积
+		double sum = 0;
+		for (int[] square : squares) {
+			if (square[1] > y) {
+				sum += (double) square[2] * square[2];
+			} else if (square[1] + square[2] > y) {
+				sum += (square[1] + square[2] - y) * square[2];
+			}
+		}
+		return sum <= area;
+	}
+}
\ No newline at end of file