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  1. #include<stdio.h>
  2. int main() {
  3.     long long int a, b, c, e;
  4.     int d = 2;
  5.     scanf("%lld %lld", &a, &b);
  6.     if (a % 2 == 0 && b % 2 == 0 ){  
  7.     	c = (b - a)/d + 1;
  8.     	e = (a  + b) / 2 * c;
  9.     	printf("%lld",e);
  10.     }
  11.     else if (a % 2 != 0 && b % 2 == 0 ){
  12.     	a = a + 1 ; 
  13.     	c = (b - a)/d + 1;
  14.     	e = (a  + b) / 2 * c;
  15.     	printf("%lld",e);
  16.     }
  17.     else if (a % 2 != 0 && b % 2 != 0 ){
  18.     	a = a + 1 ; 
  19.     	b = b - 1 ; 
  20.     	c = (b - a)/d + 1;
  21.     	e = (a  + b) / 2 * c;
  22.     	printf("%lld",e);
  23.     }
  24.     return 0;
  25. }
Success #stdin #stdout 0s 4376KB
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stdin
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-7 -3
stdout
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-10
https://ideone.com/GeDqTi
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
public

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