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  1. #include <iostream>
  2. #include <bits/stdc++.h>
  3. using namespace std;
  4.  
  5. void shortest_distance(vector<vector<int>>&matrix) {
  6. 	int n = matrix.size();
  7. 	for(int i=0;i<n;i++){
  8. 		matrix[i][i] = 0;
  9. 	}
  10. 	for(int k=0;k<n;k++){
  11. 		for(int i=0;i<n;i++){
  12. 			if(i==k) continue;
  13. 			for(int j=0;j<n;j++){
  14. 				if(i==j or j==k) continue;
  15. 				if(matrix[i][k] == -1 or matrix[k][j] == -1) continue;
  16. 				matrix[i][j] = matrix[i][j] == -1 ? matrix[i][k]+matrix[k][j] : min(matrix[i][k]+matrix[k][j],matrix[i][j]);
  17. 			}
  18. 		}
  19. 	}
  20. }
  21.  
  22. int main() {
  23. 	int V = 4;
  24. 	vector<vector<int>> matrix(V, vector<int>(V, -1));
  25. 	matrix[0][1] = 2;
  26. 	matrix[1][0] = 1;
  27. 	matrix[1][2] = 3;
  28. 	matrix[3][0] = 3;
  29. 	matrix[3][1] = 5;
  30. 	matrix[3][2] = 4;
  31.  
  32. 	shortest_distance(matrix);
  33.  
  34. 	for (auto row : matrix) {
  35. 		for (auto cell : row) {
  36. 			cout << cell << " ";
  37. 		}
  38. 		cout << endl;
  39. 	}
  40.  
  41. 	return 0;
  42. }
Success #stdin #stdout 0s 5312KB
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stdin
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Standard input is empty
stdout
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0 2 5 -1 
1 0 3 -1 
-1 -1 0 -1 
3 5 4 0
https://ideone.com/g2Pd2m
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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