first commit

J02009 - XẾP HÀNG.java

@@ -0,0 +1,28 @@
+import java.util.*;
+import java.io.*;
+
+public class Main {
+    static class pair{
+        public int first, second;
+        public pair(int a, int b){
+            first = a;
+            second = b;
+        }
+    }
+    public static void main(String[] args) throws IOException, ClassNotFoundException {
+        // Scanner sc = new Scanner(new File("ONLINE.in"));
+        Scanner sc = new Scanner(System.in);
+        int n = sc.nextInt();
+        ArrayList<pair> a = new ArrayList<>(); 
+        for(int i=0;i<n;i++) a.add(new pair(sc.nextInt(), sc.nextInt()));
+        a.sort((pair x, pair b) -> {
+            return x.first - b.first;
+        });
+        int now = 0;
+        for(int i=0;i<n;i++){
+            if(a.get(i).first>=now) now=a.get(i).first+a.get(i).second;
+            else now+=a.get(i).second;
+        }
+        System.out.println(now);
+    }
+}