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  1.  
  2. #include <iostream>
  3. using namespace std;
  4. int main()
  5. {
  6. 	int n;
  7. 	cin>>n;
  8. 	long long x;
  9. 	cin >>x;
  10. 	long long result = 0;
  11.  
  12. 	long long l;
  13.  
  14. 	long long r;
  15.  
  16.  
  17.  
  18.  
  19.     long long pointer= 0;
  20.     for(int i= 0; i < n; i++){
  21.     cin >>l;
  22. 	cin >>r;
  23.  
  24. 	if((l-pointer)%x==0){
  25. 		 result+=x;
  26. 	}
  27. 	else{
  28. 	result += (l-pointer)%x;
  29. 	result += r-l;
  30. 	}
  31. 	pointer = r;
  32.  
  33.  
  34.     }
  35.     if (x == 1)
  36.     result+=1;
  37.     cout<<result;
  38.     return 0;
  39. }
Success #stdin #stdout 0s 4524KB
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https://ideone.com/ZU6s5f
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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