c++ - Adding arrays to vector in for loop with random_shuffle -

i'm trying add int-array permutations vector in loop, when leave loop, every vector element same.

task_number = 6; vector<int*> p_0; int* order = new int[task_number]; (int k = 0; k < task_number; k++)             order[k] = k;  (int = 0; < 3; i++) {     random_shuffle(order, order+task_number);     cout << endl;     p_0.push_back(order);     (int j = 0; j < task_number; j++)         cout << p_0[i][j] << " "; } ////////////////////////////////////// cout << endl<<endl;  std::vector<int*>::iterator it; (it = p_0.begin(); != p_0.end(); ++it) {     (int j = 0; j < task_number; j++)         cout << (*it)[j] << " ";     cout << endl; } 

output:

1 3 0 2 5 4 1 4 5 3 2 0 1 3 5 4 0 2  1 3 5 4 0 2 1 3 5 4 0 2 1 3 5 4 0 2 

what problem? i'm doing wrong?

you have allocate k number of times integer pointer. if change code follows work

int task_number = 6; vector<int*> p_0;   (int = 0; < 3; i++) {     int* order = new int[task_number];     (int k = 0; k < task_number; k++)             order[k] = k;     random_shuffle(order, order+task_number);     cout << endl;     p_0.push_back(order);     (int j = 0; j < task_number; j++)         cout << p_0[i][j] << " "; } ////////////////////////////////////// cout << endl<<endl;  std::vector<int*>::iterator it; (it = p_0.begin(); != p_0.end(); ++it) {     (int j = 0; j < task_number; j++)         cout << (*it)[j] << " ";     cout << endl; }