convert_1d_array_into_2d_array.cpp

class Solution {
public:
    vector<vector<int>> construct2DArray(vector<int>& original, int m, int n) {
        if(m*n != original.size()){
            return {};
        }
        vector<vector<int>>result(m, vector<int>(n));
        int index = 0;
        for(int i = 0; i<m; i++){
            for(int j=0; j<n; j++){
                result[i][j] = original[index];
                index++;
            }
        }

        return result;
    }
};