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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4. typedef vector<vector<double>> Matrix;
  5. typedef vector<double>::size_type mat_size;
  6.  
  7.  
  8. void printMat(Matrix &mat){
  9. 	for (auto &a: mat){
  10. 		for (auto &val: a){
  11. 			cout << " "<< val << " ";
  12. 		}
  13. 		cout << endl;
  14. 	}
  15. }
  16.  
  17. void changeMat(Matrix &mat, mat_size i, mat_size j, double val){
  18. 	if(i<mat.size() && j<mat[i].size()){
  19. 		mat[i][j] = val;
  20. 	}
  21. }
  22. void border(){
  23. 	cout << "-------------------\n";
  24. }
  25. int main() {
  26. 	Matrix mat {{1,2,3}, {4,5,6}, {7,8,9}};
  27. 	printMat(mat);
  28. 	border();
  29. 	changeMat(mat, 1,1, 0);
  30. 	printMat(mat);
  31. 	border();
  32. 	changeMat(mat, 1,2, 0);
  33. 	printMat(mat);
  34. 	border();
  35. 	changeMat(mat, 4,1, 0);
  36. 	changeMat(mat, 2,5, 0);
  37. 	printMat(mat);
  38. 	// your code goes here
  39. 	return 0;
  40. }
Success #stdin #stdout 0s 3432KB
comments (?)
stdin 
Standard input is empty
stdout 
 1  2  3 
 4  5  6 
 7  8  9 
-------------------
 1  2  3 
 4  0  6 
 7  8  9 
-------------------
 1  2  3 
 4  0  0 
 7  8  9 
-------------------
 1  2  3 
 4  0  0 
 7  8  9
https://ideone.com/G72haT
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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