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  1. #include <iostream>
  2. #include <climits>
  3. #include <cmath>
  4. #include <stdexcept>
  5. using namespace std;
  6.  
  7. pair<long long, long long> decompose(long long a, long long b) {        // DONT MAKE a < b
  8. 	int k = 0;                                  // decompose a to a/b = 2^k + d, d < 2^k
  9. 	while (b < a) {
  10. 		b <<= 1;
  11. 		k++;
  12. 	}
  13. 	if (b == a) return make_pair(k, 0);
  14. 	return make_pair(--k, a - (b>>1));
  15. }
  16.  
  17. int divide(int dvd, int dvs) {
  18. 	if (dvs == 0) throw overflow_error("Divide by zero exception");
  19. 	if (dvd == 0) return 0;
  20.  
  21. 	long long ldvd, ldvs;
  22. 	ldvd = abs((long long)dvd); ldvs = abs((long long)dvs);
  23. 	if (ldvd < ldvs) return 0;
  24.  
  25. 	long long ret = 0;
  26. 	pair<long long, long long> kb;
  27. 	do{
  28. 		kb = decompose(ldvd, ldvs);
  29. 		ret += 1 << kb.first;
  30. 		ldvd = kb.second;
  31. 	} while (kb.second >= ldvs);
  32. 	return ((dvd>>31) == (dvs>>31)) ? ret : (~ret + 1);
  33. }
  34.  
  35. int main() {
  36. 	cout << divide(1, -1) << endl;
  37. 	cout << divide(2147483647, 1) << endl;
  38. 	cout << divide(-1010369383, -2147483648 ) << endl;
  39. 	cout << divide(-2147483648, -1) << endl;   // just for fun.
  40. 	// your code goes here
  41. 	return 0;
  42. }
Success #stdin #stdout 0s 3296KB
comments (?)
stdin 
Standard input is empty
stdout 
-1
2147483647
0
-2147483648
https://ideone.com/2NodqR
Divide two integers (for my blog)
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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