CODEWITHSUNDEEP
c++stdvector
TARIK
TARIK

Reputation: 5

Unintended Reallocation of Multi Dimensional Vector

I have a function two sum up, in a different way, values of a Matrix.

The different way; with transposing the matrix.

int matrixElementsSum(vector<vector<int>> matrix) {
    int sum = 0;
    vector<vector<int>> tmatrix;
    
    for(int i = 0; i < matrix[i].size(); i++)
    {
        vector<int> row;
        
        for(int j = 0; j < matrix.size(); j++)
        {
            row.push_back(matrix[j][i]);
        }
        cout << "Controlling the size" ;
        cout << "   " << matrix[i].size() << endl;
        tmatrix.push_back(row);
    } 

    for(int i = 0; i < tmatrix.size(); i++)
    {
        for(int j = 0; j < tmatrix[i].size(); j++)
        {
            if(tmatrix[i][j] == 0) break;
            sum += tmatrix[i][j];
        }
            
    }
    return sum;
}

input:

[[5, 10, 15] ,[20, 25, 30]]

output:

Controlling the size 3
Controlling the size 3
Controlling the size 8
105

And my question is: when the size of my vector is changed from 3 to 8? And also how?

Upvotes: 0

Views: 38

Answers (1)

m88
m88

Reputation: 1988

Shouldn't it be

for(int i = 0; i < matrix.size(); i++)

and

for(int j = 0; j < matrix[i].size(); j++)

?

Upvotes: 1

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