View Compilation Error

0_0_34542297_12430.cpp: In function 'int main()':
0_0_34542297_12430.cpp:48:39: error: 'reverse' was not declared in this scope
    reverse(strCpy.begin(),strCpy.end());
                                       ^
0_0_34542297_12430.cpp:67:39: error: 'reverse' was not declared in this scope
    reverse(strCpy.begin(),strCpy.end());
                                       ^