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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. vector<vector<int>> fw_correct(vector<vector<int>> W) {
  5. 	int n = (int)W.size();
  6. 	for (int b = 0; b < n; ++b)
  7. 		for (int a = 0; a < n; ++a)
  8. 			for (int c = 0; c < n; ++c)
  9. 				W[a][c] = min(W[a][c], W[a][b]+W[b][c]);
  10. 	return W;
  11. }
  12.  
  13. vector<vector<int>> fw_wrong(vector<vector<int>> W) {
  14. 	int n = (int)W.size();
  15. 	for (int a = 0; a < n; ++a)
  16. 		for (int c = 0; c < n; ++c)
  17. 			for (int b = 0; b < n; ++b)
  18. 				W[a][c] = min(W[a][c], W[a][b]+W[b][c]);
  19. 	return W;
  20. }
  21.  
  22. void print(const vector<vector<int>> &W) {
  23. 	int n = (int)W.size();
  24. 	for (int r = 0; r < n; ++r) {
  25. 		cout << '\t';
  26. 		for (int c = 0; c < n; ++c)
  27. 			cout << W[r][c] << "\t\n"[c+1==n];
  28. 	}
  29. }
  30.  
  31. int main() {
  32. 	vector<vector<int>> W(4, vector<int>(4, 99));
  33. 	W[0][2] = W[2][0] = 1;
  34. 	W[2][3] = W[3][2] = 1;
  35. 	W[3][1] = W[1][3] = 1;
  36.  
  37. 	cout << "Correct:" << endl;
  38. 	print(fw_correct(W));
  39. 	cout << "Wrong:" << endl;
  40. 	print(fw_wrong(W));
  41. }
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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Correct:
	2	3	1	2
	3	2	2	1
	1	2	2	1
	2	1	1	2
Wrong:
	2	99	1	2
	99	2	2	1
	1	2	2	1
	2	1	1	2
https://ideone.com/rdJue1
language:
C++14 (clang 8.0)
created:
5 years ago
visibility:
public

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