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  1. #include <bits/stdc++.h>
  2. #define endl "\n"
  3. using namespace std;
  4. typedef long long ll;
  5. const int mod = 1e9 + 7;
  6.  
  7. string solve(string s1, string s2){
  8. 	int len = max(s1.size(), s2.size());
  9. 	while(s1.size() != len) s1 = "0" + s1;
  10. 	while(s2.size() != len) s2 = "0" + s2;
  11. 	if(s2 > s1) swap(s1,s2);
  12. 	int nho = 0;
  13. 	string tmp = "";
  14. 	for(int i = s1.size()-1; i >= 0; i--){
  15. 		int x = (s1[i] - '0') - (s2[i] - '0') - nho;
  16. 		if(x < 0){
  17. 			x += 10;
  18. 			nho = 1;
  19. 		}
  20. 		else{
  21. 			nho = 0;
  22. 		}
  23. 		tmp = to_string(x) + tmp;
  24. 	}
  25. 	return tmp;
  26. }
  27.  
  28. int main(){
  29. 	int t;
  30. 	cin >> t;
  31. 	while(t--){
  32. 		string s1, s2;
  33. 		cin >> s1 >> s2;
  34. 		cout << solve(s1,s2) << endl;
  35. 	}
  36. }
Success #stdin #stdout 0s 5284KB
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https://ideone.com/bPtlni
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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