diff --git a/ClosestPair/ClosestPair.java b/ClosestPair/ClosestPair.java
new file mode 100644
index 00000000..760ef7fd
--- /dev/null
+++ b/ClosestPair/ClosestPair.java
@@ -0,0 +1,211 @@
+import java.io.*;
+import java.util.*;
+
+public class ClosestPair {
+	static int count = 0;// array length
+	static int secondCount = 0;// array length
+	static Location array[] = new Location[10000];
+	static Location point1 = null; // Minimum point coordinate
+	static Location point2 = null; // Minimum point coordinate
+	static double minNum = Double.MAX_VALUE;// Minimum point length
+
+	private static class Location { // Location class
+		double x = 0, y = 0;
+
+		public Location(double x, double y) { //Save x, y coordinates
+			this.x = x;
+			this.y = y;
+		}
+	}
+
+	public static int xPartition(Location[] a, int first, int last) { // x-axis Quick Sorting
+		Location pivot = a[last]; // pivot
+		int pIndex = last;
+		int i = first - 1;
+		Location temp; // Temporarily store the value for position transformation
+		for (int j = first; j <= last - 1; j++) {
+			if (a[j].x <= pivot.x) { // Less than or less than pivot
+				i++;
+				temp = a[i]; // array[i] <-> array[j]
+				a[i] = a[j];
+				a[j] = temp;
+			}
+		}
+		i++;
+		temp = a[i];// array[pivot] <-> array[i]
+		a[i] = a[pIndex];
+		a[pIndex] = temp;
+		return i;// pivot index
+	}
+	public static int yPartition(Location[] a, int first, int last) { //y-axis Quick Sorting
+		Location pivot = a[last]; // pivot
+		int pIndex = last;
+		int i = first - 1;
+		Location temp; // Temporarily store the value for position transformation
+		for (int j = first; j <= last - 1; j++) {
+			if (a[j].y <= pivot.y) { // Less than or less than pivot
+				i++;
+				temp = a[i]; // array[i] <-> array[j]
+				a[i] = a[j];
+				a[j] = temp;
+			}
+		}
+		i++;
+		temp = a[i];// array[pivot] <-> array[i]
+		a[i] = a[pIndex];
+		a[pIndex] = temp;
+		return i;// pivot index
+	}
+
+	public static void xQuickSort(Location[] a, int first, int last) { //x-axis Quick Sorting
+		if (first < last) {
+			int q = xPartition(a, first, last); // pivot
+			xQuickSort(a, first, q - 1); // Left
+			xQuickSort(a, q + 1, last); // Right
+		}
+	}
+
+	public static void yQuickSort(Location[] a, int first, int last) { //y-axis Quick Sorting
+		if (first < last) {
+			int q = yPartition(a, first, last); // pivot
+			yQuickSort(a, first, q - 1); // Left
+			yQuickSort(a, q + 1, last); // Right
+		}
+	}
+
+	public static double closestPair(Location[] a, int indexNum, int first, int last) {// closestPair
+		Location divideArray[] = new Location[indexNum]; // array stored before divide
+		System.arraycopy(a, 0, divideArray, 0, indexNum); // Copy from previous array
+
+		int totalNum = indexNum; // number of coordinates in the divideArray array
+		int divideX = indexNum / 2; // Intermediate value for divide
+		Location leftArray[] = new Location[divideX]; //divide - left array
+		Location rightArray[] = new Location[totalNum - divideX]; //divide - right array
+
+		if (indexNum <= 3) { // If the number of coordinates is 3 or less
+			return bruteForce(divideArray);
+		}
+		System.arraycopy(divideArray, 0, leftArray, 0, divideX); //divide - left array
+		System.arraycopy(divideArray, divideX, rightArray, 0, totalNum - divideX); //divide - right array
+
+		double minLeftArea = 0; //Minimum length of left array
+		double minRightArea = 0; //Minimum length of right array
+		double minValue = 0; //Minimum lengt
+
+		minLeftArea = closestPair(leftArray, divideX, 0, divideX - 1); // recursive closestPair
+		minRightArea = closestPair(rightArray, totalNum - divideX, divideX, totalNum - divideX - 1);
+		minValue = Math.min(minLeftArea, minRightArea);// window size (= minimum length)
+
+		// Create window
+		for (int i = 0; i < totalNum; i++) { // Set the size for creating a window and creating a new array for the coordinates in the window
+			double xGap = Math.abs(divideArray[divideX].x - divideArray[i].x);
+			if (xGap < minValue) {
+				secondCount++; // size of the array
+			} else {
+				if (divideArray[i].x > divideArray[divideX].x) {
+					break;
+				}
+			}
+		}
+		Location firstWindow[] = new Location[secondCount]; // new array for coordinates in window
+		int k = 0;
+		for (int i = 0; i < totalNum; i++) {
+			double xGap = Math.abs(divideArray[divideX].x - divideArray[i].x);
+			if (xGap < minValue) { // if it's inside a window
+				firstWindow[k] = divideArray[i]; // put in an array
+				k++;
+			} else {
+				if (divideArray[i].x > divideArray[divideX].x) {
+					break;
+				}
+			}
+		}
+		yQuickSort(firstWindow, 0, secondCount - 1);// Sort by y coordinates
+		/ * Coordinates in Window * /
+		double length = 0; 
+		for (int i = 0; i < secondCount - 1; i++) { // size comparison within window
+			for (int j = (i + 1); j < secondCount; j++) {
+				double xGap = Math.abs(firstWindow[i].x - firstWindow[j].x);
+				double yGap = Math.abs(firstWindow[i].y - firstWindow[j].y);
+				if (yGap < minValue) {
+					length = (double) Math.sqrt(Math.pow(xGap, 2) + Math.pow(yGap, 2));
+					if (length < minValue) { // If the measured distance is less than the current minimum distance
+						minValue = length;// Change minimum distance to current distance
+						if (length < minNum) { // Conditional statement for registering final coordinate
+							minNum = length;
+							point1 = firstWindow[i];
+							point2 = firstWindow[j];
+						}
+					}
+				} 
+				else
+					break;
+			}
+		}
+		secondCount = 0;
+		return minValue;
+	}
+
+	public static double bruteForce(Location[] array) { // When the number of coordinates is less than 3
+		double minValue = Double.MAX_VALUE; // minimum distance
+		double length = 0; 
+		double xGap = 0, yGap = 0; // Difference between x, y coordinates
+		if (array.length == 2) { // When there are two coordinates
+			xGap = (array[0].x - array[1].x); // Difference between x coordinates
+			yGap = (array[0].y - array[1].y); // Difference between y coordinates
+			length = (double) Math.sqrt(Math.pow(xGap, 2) + Math.pow(yGap, 2)); // distance between coordinates
+			if (length < minNum) { // Conditional statement for registering final coordinate
+				minNum = length;
+				point1 = array[0];
+				point2 = array[1];
+			}
+			return length;
+		} else if (array.length == 3) { // When there are 3 coordinates
+			for (int i = 0; i < array.length - 1; i++) {
+				for (int j = (i + 1); j < array.length; j++) {
+					xGap = (array[i].x - array[j].x); // Difference between x coordinates
+					yGap = (array[i].y - array[j].y); // Difference between y coordinates
+					length = (double) Math.sqrt(Math.pow(xGap, 2) + Math.pow(yGap, 2));  // distance between coordinates
+					if (length < minValue) { // If the measured distance is less than the current minimum distance
+						minValue = length; // Change minimum distance to current distance
+						if (length < minNum) { // Conditional statement for registering final coordinate
+							minNum = length;
+							point1 = array[i];
+							point2 = array[j];
+						}
+					}
+				}
+			}
+			return minValue;
+		}
+		return minValue;
+	}
+
+	public static void main(String[] args) throws IOException {
+		// TODO Auto-generated method stub
+		StringTokenizer token;
+
+		BufferedReader in = new BufferedReader(new FileReader("closest_data.txt"));
+		//Input data consists of one x-coordinate and one y-coordinate
+		String ch;
+
+		System.out.println("Input data");
+		while ((ch = in.readLine()) != null) {
+			token = new StringTokenizer(ch, " "); 
+
+			array[count] = new Location(Double.parseDouble(token.nextToken()), Double.parseDouble(token.nextToken())); // put in an array
+			count++; // the number of coordinates actually in the array
+			System.out.println("x: "+array[count - 1].x + ", y: " + array[count - 1].y);
+		}
+
+		xQuickSort(array, 0, count - 1); // Sorting by x value
+
+		double result; // minimum distance
+		result = closestPair(array, count, 0, count - 1); // ClosestPair start
+		System.out.println("Output Data");// minimum distance coordinates and distance output
+		System.out.println("(" + point1.x + ", " + point1.y + ")");
+		System.out.println("(" + point2.x + ", " + point2.y + ")");
+		System.out.println("Minimum Distance : " + result);
+
+	}
+}
diff --git a/ClosestPair/closest_data.txt b/ClosestPair/closest_data.txt
new file mode 100644
index 00000000..8ebef63f
--- /dev/null
+++ b/ClosestPair/closest_data.txt
@@ -0,0 +1,12 @@
+2 3
+2 16
+3 9
+6 3
+7 7
+9 12
+10 11
+15 2
+15 19
+16 11
+17 13
+19 4
diff --git a/MinimizingLateness/MinimizingLateness.java b/MinimizingLateness/MinimizingLateness.java
new file mode 100644
index 00000000..a6613cbc
--- /dev/null
+++ b/MinimizingLateness/MinimizingLateness.java
@@ -0,0 +1,52 @@
+import java.io.*;
+import java.util.*;
+
+public class MinimizingLateness {
+
+	private static class Schedule { // Schedule class
+		int t = 0; // Time required for the operation to be performed
+		int d = 0; // Time the job should be completed
+		int s = 0; // Start time of the task
+		int f = 0; // End time of the operation
+
+		public Schedule(int t, int d) {
+			this.t = t; 
+			this.d = d; 
+		}
+	}
+
+	public static void main(String[] args) throws IOException {
+		// TODO Auto-generated method stub
+		StringTokenizer token;
+
+		String ch;
+		BufferedReader in = new BufferedReader(new FileReader("input.txt"));
+		int indexCount; // size of array index
+		ch = in.readLine();
+		indexCount = Integer.parseInt(ch); // The first line specifies the size of the operation (= the size of the array)
+		System.out.println("Input Data : ");
+		System.out.println(indexCount); // number of operations
+		Schedule array[] = new Schedule[indexCount]; // Create an array to hold the operation
+		int i = 0;
+		while ((ch = in.readLine()) != null) {
+			token = new StringTokenizer(ch, " "); 
+			// Include the time required for the operation to be performed in the array and the time it should be completed.
+			array[i] = new Schedule(Integer.parseInt(token.nextToken()), Integer.parseInt(token.nextToken()));
+			i++; // 다음 인덱스
+			System.out.println(array[i - 1].t + " " + array[i - 1].d); 
+		}
+
+		int tryTime = 0; // Total time worked
+		int lateness = 0; // Lateness
+		for (int j = 0; j < indexCount - 1; j++) {
+			array[j].s = tryTime; // Start time of the task
+			array[j].f = tryTime + array[j].t; // Time finished
+			tryTime = tryTime + array[j].t; // Add total work time
+			// Lateness
+			lateness = lateness + Math.max(0, tryTime - array[j].d);
+		}
+		System.out.println();
+		System.out.println("Output Data : "); 
+		System.out.println(lateness);
+	}
+}
diff --git a/MinimizingLateness/data06_lateness.txt b/MinimizingLateness/data06_lateness.txt
new file mode 100644
index 00000000..e2bac0d1
--- /dev/null
+++ b/MinimizingLateness/data06_lateness.txt
@@ -0,0 +1,7 @@
+6
+3 6
+2 8
+1 9
+4 9
+3 14
+2 15
\ No newline at end of file