View Compilation Error

0_0_30275160_26750.cpp: In function 'int main()':
0_0_30275160_26750.cpp:15:21: error: 'srand' was not declared in this scope
     srand(time(NULL));
                     ^
0_0_30275160_26750.cpp:31:46: error: 'rand' was not declared in this scope
             for(int i=1;i<=n;i++)col[i]=rand()%K;
                                              ^