View Compilation Error

0_0_35213210_19303.cpp: In function 'int main()':
0_0_35213210_19303.cpp:34:9: error: 'cout' was not declared in this scope
         cout<<dp[len-1]<<endl;
         ^
0_0_35213210_19303.cpp:34:26: error: 'endl' was not declared in this scope
         cout<<dp[len-1]<<endl;
                          ^