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  1. import java.io.*;
  2. import java.util.*;
  3.  
  4. public class Main {
  5. 	public static void main(String[] args) {
  6. 		Scanner in = new Scanner(System.in);
  7. 		PrintWriter out = new PrintWriter(System.out);
  8.  
  9. 		long a = in.nextLong();
  10. 		long b = in.nextLong();
  11. 		long n, S;
  12. 		n = b - a + 1;
  13. 		S = (a + b) * n / 2;
  14. 		out.print(S);
  15.  
  16. 		out.flush();
  17. 	}
  18. }
Success #stdin #stdout 0.07s 2184192KB
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stdin
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249 318
stdout
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19845
https://ideone.com/plPgCH
[2860] Сумма чисел на промежутке
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
secret

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